Abstract:
Compositions of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8, are disclosed. Also disclosed are compositions of N(CF 3 ) 3  and butane, cyclopropane, dimethyl ether or isobutane. These compositions are useful as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents.

Description:
FIELD OF THE INVENTION 
     This invention relates to compositions that include a fluoroamine as a component. These compositions are useful as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, refrigerants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents. 
     BACKGROUND OF THE INVENTION 
     Fluorinated hydrocarbons have many uses, one of which is as a refrigerant. Such refrigerants include dichlorodifluoromethane (CFC-12) and chlorodifluoromethane (HCFC-22). 
     In recent years it has been pointed out that certain kinds of fluorinated hydrocarbon refrigerants released into the atmosphere may adversely affect the stratospheric ozone layer. Although this proposition has not yet been completely established, there is a movement toward the control of the use and the production of certain chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) under an international agreement. 
     Accordingly, there is a demand for the development of refrigerants that have a lower ozone depletion potential than existing refrigerants while still achieving an acceptable performance in refrigeration applications. Compositions which do not include chlorine or bromine have been suggested as replacements for CFCs and HCFCs since HFCs have no chlorine and therefore have zero ozone depletion potential. 
     In refrigeration applications, a refrigerant is often lost during operation through leaks in shaft seals, hose connections, soldered joints and broken lines. In addition, the refrigerant may be released to the atmosphere during maintenance procedures on refrigeration equipment. If the refrigerant is not a pure component or an azeotropic or azeotrope-like composition, the refrigerant composition may change when leaked or discharged to the atmosphere from the refrigeration equipment, which may cause the refrigerant to become flammable or to have poor refrigeration performance. 
     Accordingly, it is desirable to use as a refrigerant a pure compound or an azeotropic or azeotrope-like composition of compounds that do not contain chlorine or bromine, such as fluorinated amines, fluorinated hydrocarbons, ethers or hydrocarbons. 
     Fluorinated amines, fluorinated hydrocarbons, ethers and hydrocarbons may also be used cleaning agents or solvents to clean, for example, electronic circuit boards. It is desirable that the cleaning agents be azeotropic or azeotrope-like because in vapor degreasing operations the cleaning agent is generally redistilled and reused for final rinse cleaning. 
     Azeotropic or azeotrope-like compositions that include a fluorinated amines, fluorinated hydrocarbons, ethers or hydrocarbons fluorinated hydrocarbon or a fluorinated amine are also useful as blowing agents in the manufacture of closed-cell polyurethane, phenolic and thermoplastic foams, as propellants in aerosols, as heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids such as for heat pumps, inert media for polymerization reactions, fluids for removing particulates from metal surfaces, as carrier fluids that may be used, for example, to place a fine film of lubricant on metal parts, as buffing abrasive agents to remove buffing abrasive compounds from polished surfaces such as metal, as displacement drying agents for removing water, such as from jewelry or metal parts, as resist developers in conventional circuit manufacturing techniques including chlorine-type developing agents, or as strippers for photoresists when used with, for example, a chlorohydrocarbon such as 1,1,1-trichloroethane or trichloroethylene. 
     SUMMARY OF THE INVENTION 
     The present invention relates to the discovery of compositions of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8. Compositions of the present invention include compositions of tris(trifluoromethyl)amine (N(CF 3 ) 3 ) and trifluoromethane (HFC-23), difluoromethane (HFC-32), 1,1,1,2-tetrafluoroethane (HFC-134a), 1,1-difluoroethane (HFC-152a), fluoroethane (HFC-161), 1,1,1,2,2,3-hexafluoropropane (HFC-236cb), 1,1,2,3,3,3-hexafluoropropane (HFC-236ea), 1,1,1,3,3,3-hexafluoropropane (HFC-236fa), 1,1,1,3,3-pentafluoropropane (HFC-245fa), 1,2,2,3-tetrafluoropropane (HFC-254ca), 1,1,2,2-tetrafluoropropane (HFC-254cb), 1,1,1,2-tetrafluoropropane (HFC-254eb), 1,2,2-trifluoropropane (HFC-263ca), 1,1,1-trifluoropropane (HFC-263fb), 2,2-difluoropropane (HFC-272ca), 1,2-difluoropropane (HFC-272ea), 1,1-difluoropropane (HFC-272fb), 2-fluoropropane (HFC-281ea) or 1-fluoropropane (HFC-281fa); bis(difluoromethyl)trifluoromethylamine (N(CHF 2 ) 2  (CF 3 )) and 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,2,3,3-pentafluoropropane (HFC-245ea), 1,1,1,2,3-pentafluoropropane (HFC-245eb), 1,2,2,3-tetrafluoropropane (HFC-254ca), 1,2,2-trifluoropropane (HFC-263ca) or 1,2-difluoropropane (HFC-272ea); and fluoromethylbis(trifluoromethyl)amine (N(CH 2  F)(CF 3 ) 2 ) and 1,1,2,2,3-pentafluoropropane (HFC-245ca), 1,1,2,3,3-pentafluoropropane (HFC-245ea), 1,2,2,3-tetrafluoropropane (HFC-254ca), 1,2,2-trifluoropropane (HFC 263ca) or 1,2-difluoropropane (HFC-272ea). Further, the invention relates to compositions of N(CF 3 ) 3  and butane, cyclopropane, dimethylether (DME) or isobutane. 
     These compositions are useful as refrigerants, cleaning agents, expansion agents for polyolefins and polyurethanes, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, buffing abrasive agents, and displacement drying agents. 
     Further, the invention relates to the discovery of azeotropic or azeotrope-like compositions comprising effective amounts of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8, to form an azeotropic or azeotrope-like composition. Azeotropic or azeotrope-like compositions of this invention include effective amounts of N(CF 3 ) 3  and HFC-23, HFC-32, HFC-134a, HFC-152a, HFC-161, HFC-236cb, HFC-236ea, HFC-236fa, HFC 245fa, HFC-254ca, HFC 254cb, HFC-254eb, HFC-263ca, HFC-263fb, HFC-272ca, HFC-272ea, HFC-272fb, HFC-281ea or HFC-281fa; N(CHF 2 ) 2  (CF 3 ) and HFC-245ca, HFC-245ea, HFC-245eb, HFC-254ca, HFC-263ca or HFC-272ea; N(CH.sub. 2 F)(CF 3 ) 2  and HFC-245ca, HFC-245ea, HFC-254ca, HFC-263ca or HFC-272ea; and N(CF 3 ) 3  and butane, cyclopropane, DME or isobutane to form an azeotropic or azeotrope-like composition. 
     DETAILED DESCRIPTION 
     The present invention relates to compositions of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8. Compositions of the present invention include compositions of N(CF 3 ) 3  and HFC-23, HFC-32, HFC-134a, HFC-152a, HFC-161, HFC-236cb, HFC-236ea, HFC-236fa, HFC 245fa, HFC-254ca, HFC 254cb, HFC-254eb, HFC-263ca, HFC-263fb, HFC-272ca, HFC-272ea, HFC-272fb, HFC-281ea or HFC-281fa; N(CHF 2 ) 2  (CF 3 ) and HFC-245ca, HFC-245ea, HFC-245eb, HFC-254ca, HFC-263ca or HFC-272ea; N(CH 2  F)(CF 3 ) 2  and HFC-245ca, HFC-245ea, HFC-254ca, HFC-263ca or HFC-272ea; and N(CF 3 ) 3  and butane, cyclopropane, DME or isobutane. 
     The present invention also relates to the discovery of azeotropic or azeotrope-like compositions of effective amounts of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8, to form an azeotropic or azeotrope-like composition. Azeotropic or azeotrope-like compositions of this invention include effective amounts of N(CF 3 ) 3  and HFC-23, HFC-32, HFC-134a, HFC-152a, HFC-161, HFC-236cb, HFC-236ea, HFC-236fa, HFC 245fa, HFC-254ca, HFC 254cb, HFC-254eb, HFC-263ca, HFC-263fb, HFC-272ca, HFC-272ea, HFC-272fb, HFC-281ea or HFC-281fa; N(CHF 2 ) 2  (CF 3 ) and HFC-245ca, HFC-245ea, HFC-245eb, HFC-254ca, HFC-263ca or HFC-272ea; N(CH 2  F)(CF 3 ) 2  and HFC-245ca, HFC-245ea, HFC-254ca, HFC-263ca or HFC-272ea; and N(CF 3 ) 3  and butane, cyclopropane, DME or isobutane to form an azeotropic or azeotrope-like composition. 
     By &#34;azeotropic&#34; composition is meant a constant boiling liquid admixture of two or more substances that behaves as a single substance. One way to characterize an azeotropic composition is that the vapor produced by partial evaporation or distillation of the liquid has the same composition as the liquid from which it was evaporated or distilled, that is, the admixture distills/refluxes without compositional change. Constant boiling compositions are characterized as azeotropic because they exhibit either a maximum or minimum boiling point, as compared with that of the non-azeotropic mixtures of the same components. 
     By &#34;azeotrope-like&#34; composition is meant a constant boiling, or substantially constant boiling, liquid admixture of two or more substances that behaves as a single substance. One way to characterize an azeotrope-like composition is that the vapor produced by partial evaporation or distillation of the liquid has substantially the same composition as the liquid from which it was evaporated or distilled, that is, the admixture distills/refluxes without substantial composition change. 
     It is recognized in the art that a composition is azeotrope-like if, after 50 weight percent of the composition is removed such as by evaporation or boiling off, the difference in vapor pressure between the original composition and the composition remaining after 50 weight percent of the original composition has been removed is less than 10 percent, when measured in absolute units. By absolute units, it is meant measurements of pressure and, for example, psia, atmospheres, bars, torr, dynes per square centimeter, millimeters of mercury, inches of water and other equivalent terms well known in the art. If an azeotrope is present, there is no difference in vapor pressure between the original composition and the composition remaining after 50 weight percent of the original composition has been removed. 
     Therefore, included in this invention are compositions of effective amounts of N(CF 3 ) a  (CHF 2 ) b  (CH 2  F) c , where a, b and c are integers from 0 to 3 and a+b+c=3, and C n  F m  H 2n+2-m , where n is an integer from 1 to 3 and m is an integer from 1 to 8, including effective amounts of N(CF 3 ) 3  and HFC-23, HFC-32, HFC-134a, HFC-152a, HFC-161, HFC-236cb, HFC-236ea, HFC-236fa, HFC 245fa, HFC-254ca, HFC 254cb, HFC-254eb, HFC-263ca, HFC-263fb, HFC-272ca, HFC-272ea, HFC-272fb, HFC-281ea or HFC-281fa; N(CHF 2 ) 2  (CF 3 ) and HFC-245ca, HFC-245ea, HFC-245eb, HFC-254ca, HFC-263ca or HFC-272ea; N(CH 2  F)(CF 3 ) 2  and HFC-245ca, HFC-245ea, HFC-254ca, HFC-263ca or HFC-272ea; and N(CF 3 ) 3  and butane, cyclopropane, DME or isobutane; such that after 50 weight percent of an original composition is evaporated or boiled off to produce a remaining composition, the difference in the vapor pressure between the original composition and the remaining composition is 10 percent or less. 
     The components of the compositions of this invention have the following vapor pressures at 25° C. 
     
         ______________________________________COMPONENTS        PSIA    KPA______________________________________HFC-23            665.5   4588HFC-32            246.7   1701HFC-134a          98.3    677HFC-152a          85.8    591HFC-161           130.2   898HFC-236cb         33.6    232HFC-236ea         29.8    206HFC-236fa         39.4    271HFC-245fa         21.6    149HFC-254ca         13.7     95HFC-254cb         34.2    236HFC-254eb         34.7    240HFC-263ca         18.2    126HFC-263fb         54.0    372HFC-272ca         34.5    238HFC-272ea         20.8    143HFC-272fb         26.5    182N(CF.sub.3).sub.3 45.8    316HFC-281ea         47.1    325HFC-281fa         37.7    260butane            35.2    243cyclopropane      105.0   724DME               85.7    591isobutane         50.5    348N(CHF.sub.2).sub.2 (CF.sub.3)             13.9     96HFC-245ca         14.2     98HFC-245ea         14.2     98HFC-245eb         16.9    117N(CH.sub.2 F)(CF.sub.3).sub.2             14.2     98______________________________________ 
    
     Substantially constant boiling, azeotropic or azeotrope-like compositions of this invention comprise the following (all compositions are measured at 25° C.): 
     
         ______________________________________            WEIGHT            RANGES      PREFERREDCOMPONENTS       (wt. %/wt/%)                        (wt. %/wt. %)______________________________________N(CF.sub.3).sub.3 /HFC-23             1-47/53-99  1-40/60-99N(CF.sub.3).sub.3 /HFC-32            20-74/26-80 20-74/26-80N(CF.sub.3).sub.3 /HFC-134a             1-66/34-99  1-60/40-99N(CF.sub.3).sub.3 /HFC-152a             1-78/22-99 30-78/22-70N(CF.sub.3).sub.3 /HFC-161            20-76/24-80 30-76/24-70N(CF.sub.3).sub.3 /HFC-236cb            1-99/1-99   40-99/1-60N(CF.sub.3).sub.3 /HFC-236ea            32-99/1-68  40-99/1-60N(CF.sub.3).sub.3 /HFC-236fa            1-99/1-99   40-99/1-60N(CF.sub.3).sub.3 /HFC-245fa            52-99.2/0.8-48                        60-99.2/0.8-40N(CF.sub.3).sub.3 /HFC-254ca            65-99.5/0.5-35                        65-99.5/0.5-35N(CF.sub.3).sub.3 /HFC-254cb            1-99/1-99   50-99/1-50N(CF.sub.3).sub.3 /HFC-254eb            1-99/1-99   50-99/1-50N(CF.sub.3).sub.3 /HFC-263ca            60-99/1-40  80-99/1-80N(CF.sub.3 ).sub.3 /HFC-263fb            1-99/1-99   40-99/1-60N(CF.sub.3).sub.3 /HFC-272ca            44-99/1-56  50-99/1-50N(CF.sub.3).sub.3 /HFC-272ea            62-99/1-38  70-99/1-30N(CF.sub.3).sub.3 /HFC-272fb            56-99/1-44  70-99/1-30N(CF.sub.3).sub.3 /HFC-281ea            39-99/1-61  50-99/1-50N(CF.sub.3).sub.3 /HFC-281fa            48-99/1-52  50-99/1-50N(CF.sub.3).sub.3 /butane            1-99/1-99   70-99/1-30N(CF.sub.3).sub.3 /cyclopropane             1-80/20-99 20-80/20-80N(CF.sub.3).sub.3 /DME            30-83/17-70 40-83/17-60N(CF.sub.3).sub.3 /isobutane            1-99/1-99   40-99/1-60N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ca            1-99/1-99   25-75/25-75N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ea            1-99/1-99   25-75/25-75N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245eb            1-99/1-99   1-99/1-99N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-254ca            1-99/1-99   40-99/1-60N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-263ca            1-99/1-99   15- 99/1-85N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-272ea            1-99/1-99   10-99/1-90N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ca            1-99/1-99   40-99/1-60N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ea            1-99/1-99   40-99/1-60N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-254ca            1-99/1-99   40-99/1-60N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-263ca            1-99/1-99   10-99/1-90N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-272ea            1-99/1-99   10-99/1-90______________________________________ 
    
     For purposes of this invention, &#34;effective amount&#34; is defined as the amount of each component of the inventive compositions which, when combined, results in the formation of an azeotropic or azeotrope-like composition. This definition includes the amounts of each component, which amounts may vary depending on the pressure applied to the composition so long as the azeotropic or azeotrope-like compositions continue to exist at the different pressures, but with possible different boiling points. 
     Therefore, effective amount includes the amounts, such as may be expressed in weight percentages, of each component of the compositions of the instant invention which form azeotropic or azeotrope-like compositions at temperatures or pressures other than as described herein. 
     For the purposes of this discussion, azeotropic or constant-boiling is intended to mean also essentially azeotropic or essentially-constant boiling. In other words, included within the meaning of these terms are not only the true azeotropes described above, but also other compositions containing the same components in different proportions, which are true azeotropes at other temperatures and pressures, as well as those equivalent compositions which are part of the same azeotropic system and are azeotrope-like in their properties. As is well recognized in this art, there is a range of compositions which contain the same components as the azeotrope, which will not only exhibit essentially equivalent properties for refrigeration and other applications, but which will also exhibit essentially equivalent properties to the true azeotropic composition in terms of constant boiling characteristics or tendency not to segregate or fractionate on boiling. 
     It is possible to characterize, in effect, a constant boiling admixture which may appear under many guises, depending upon the conditions chosen, by any of several criteria: 
     The composition can be defined as an azeotrope of A, B, C (and D . . . ) since the very term &#34;azeotrope&#34; is at once both definitive and limitative, and requires that effective amounts of A, B, C (and D . . . ) for this unique composition of matter which is a constant boiling composition. 
     It is well known by those skilled in the art, that, at different pressures, the composition of a given azeotrope will vary at least to some degree, and changes in pressure will also change, at least to some degree, the boiling point temperature. Thus, an azeotrope of A, B, C (and D . . . ) represents a unique type of relationship but with a variable composition which depends on temperature and/or pressure. Therefore, compositional ranges, rather than fixed compositions, are often used to define azeotropes. 
     The composition can be defined as a particular weight percent relationship or mole percent relationship of A, B, C (and D . . . ), while recognizing that such specific values point out only one particular relationship and that in actuality, a series of such relationships, represented by A, B, C (and D . . . ) actually exist for a given azeotrope, varied by the influence of pressure. 
     An azeotrope of A, B, C (and D . . . ) can be characterized by defining the compositions as an azeotrope characterized by a boiling point at a given pressure, thus giving identifying characteristics without unduly limiting the scope of the invention by a specific numerical composition, which is limited by and is only as accurate as the analytical equipment available. 
     The azeotrope or azeotrope-like compositions of the present invention can be prepared by any convenient method including mixing or combining the desired amounts. A preferred method is to weigh the desired component amounts and thereafter combine them in an appropriate container. 
    
    
     Specific examples illustrating the invention are given below. Unless otherwise stated therein, all percentages are by weight. It is to be understood that these examples are merely illustrative arid in no way are to be interpreted as limiting the scope of the invention. 
     EXAMPLE 1 
     Phase Study 
     A phase study shows the following compositions are azeotropic. The temperature is 25° C. 
     
         ______________________________________                  Vapor Press.Composition     Weight Percents                        psia    kPa______________________________________N(CF.sub.3).sub.3 /HFC-23            4.3/95.7    668.5   4609N(CF.sub.3).sub.3 /HFC-32           35.0/65.0    277.2   1911N(CF.sub.3).sub.3 /HFC-134a           27.7/72.3    103.8   716N(CF.sub.3).sub.3 /HFC-152a           49.2/50.8    101.0   696N(CF.sub.3).sub.3 /HFC-161           45.7/54.3    148.3   1022N(CF.sub.3).sub.3 /HFC-236cb           88.2/11.8    46.2    319N(CF.sub.3).sub.3 /HFC-236ea           82.2/17.8    47.4    327N(CF.sub.3).sub.3 /HFC-236fa           66.9/33.1    50.0    345N(CF.sub.3).sub.3 /HFC-245fa           99.2/0.8     45.8    316N(CF.sub.3).sub.3 /HFC-254ca           99.5/0.5     45.8    316N(CF.sub.3).sub.3 /HFC-254cb           79.5/20.5    48.4    334N(CF.sub.3).sub.3 /HFC-254eb           78.7/21.3    48.5    334N(CF.sub.3).sub.3 /HFC-263ca           92.7/7.3     46.8    323N(CF.sub.3).sub.3 /HFC-263fb           49.1/50.9    58.0    400N(CF.sub.3).sub.3 /HFC-272ca           78.3/21.7    52.9    365N(CF.sub.3).sub.3 /HFC-272ea           90.2/9.8     48.3    333N(CF.sub.3).sub.3 /HFC-272fb           86.2/13.8    49.6    342N(CF.sub.3).sub.3 /HFC-281ea           71.2/28.8    59.3    409N(CF.sub.3).sub.3 /HFC-281fa           79.3/20.7    55.5    383N(CF.sub.3).sub.3 /butane           89.2/10.8    47.8    330N(CF.sub.3).sub.3 /cyclopropane           38.3/61.7    108.3   747N(CF.sub.3).sub.3 /DME           59.0/41.0    102.9   709N(CF.sub.3).sub.3 /isobutane           61.8/38.2    52.5    362N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ca           50.4/49.6    15.0    103N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ea           50.5/49.5    14.9    103N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245eb            3.3/96.7    16.9    117N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-254ca           59.1/40.9    15.2    105N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-263ca           27.6/72.4    18.6    128N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-272ea           20.1/79.9    20.9    144N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ca           54.7/45.3    15.0    103N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ea           55.2/44.8    14.9    103N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-254ca           62.4/37.6    15.2    105N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-263ca           26.5/73.5    18.5    128N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-272ea           17.0/83.0    20.9    144______________________________________ 
    
     EXAMPLE 2 
     Impact of Vapor Leakage on Vapor Pressure at 25° C. 
     A vessel is charged with an initial liquid composition at 25° C. The liquid, and the vapor above the liquid, are allowed to come to equilibrium, and the vapor pressure in the vessel is measured. Vapor is allowed to leak from the vessel, while the temperature is held constant at 25° C., until 50 weight percent of the initial charge is removed, at which time the vapor pressure of the composition remaining in the vessel is measured. The results are summarized below. 
     
         ______________________________________    0 wt %      50 wt %Refrigerant    evaporated  evaporated  0% change inComposition    psia    kPa     psia  kPa   vapor pressure______________________________________N(CF.sub.3).sub.3 /HFC-23 4.3/95.7    668.5   4609    668.5 4609  0.0 1/99    667.1   4600    666.6 4596  0.130/70    659.7   4548    644.9 4446  2.232/68    658.5   4540    640.7 4417  2.735/65    656.4   4526    633.2 4366  3.540/60    652.2   4497    616.9 4253  5.445/55    646.5   4457    594.7 4100  8.047/53    643.8   4439    583.8 4025  9.348/52    642.4   4429    577.8 3984  10.1N(CF.sub.3).sub.3 /HFC-3235/65    277.2   1911    277.2 1911  0.025/75    277.1   1911    277.0 1910  0.020/80    277.1   1911    259.9 1792  6.260/40    276.4   1906    273.0 1882  1.270/30    274.6   1893    260.8 1798  5.075/25    272.7   1880    243.2 1677  10.874/26    273.2   1884    248.0 1710  9.2N(CF.sub.3).sub.3 /HFC-134a27.7/72.3    103.8   716     103.8 716   0.015/85    103.0   710     102.3 705   0.7 1/99    98.8    681     98.5  679   0.350/50    101.8   702     99.5  686   2.360/40    99.3    685     93.4  644   5.970/30    94.9    654     83.0  572   12.565/35    97.4    672     88.9  613   8.767/33    96.5    665     86.7  598   10.266/34    97.0    669     87.8  605   9.5N(CF.sub.3).sub.3 /HFC-152a49.2/50.8    101.0   696     101.0 696   0.030/70    100.1   690     97.1  669   3.020/80    98.5    679     90.2  622   8.417/83    97.7    674     88.5  610   9.416/84    97.4    672     88.1  607   9.515/85    97.1    669     87.7  605   9.714/86    96.8    667     87.4  603   9.713/87    96.4    665     87.1  601   9.612/88    96.0    662     86.9  599   9.510/90    95.0    655     86.5  596   8.9 1/99    87.2    601     85.8  592   1.670/30    99.2    684     95.5  658   3.780/20    95.2    656     83.4  575   12.475/25    97.7    674     90.8  626   7.178/22    96.4    665     86.8  598   10.0N(CF.sub.3).sub.3 /HFC-16145.7/54.3    148.3   1022    148.3 1022  0.020/80    147.0   1014    132.7 915   9.719/81    146.8   1012    132.0 910   10.177/23    143.4   989     128.7 887   10.376/24    144.0   993     131.0 903   9.0N(CF.sub.3).sub.3 /HFC-236cb88.2/11.8    46.2    319     46.2  319   0.099/1     45.9    316     45.9  316   0.060/40    44.8    309     44.3  305   1.140/60    42.4    292     41.1  283   3.120/80    39.0    269     37.0  255   5.1 1/99    34.0    234     33.7  232   0.9N(CF.sub.3).sub.3 /HFC-236ea82.2/17.8    47.4    327     47.4  327   0.090/10    47.2    325     47.1  325   0.299/1     46.0    317     46.0  317   0.060/40    46.1    318     45.3  312   1.740/60    43.4    299     40.4  279   6.933/67    42.1    290     38.0  262   9.732/68    41.9    289     37.7  260   10.0N(CF.sub.3).sub.3 /HFC-236fa66.9/33.1    50.0     345    50.0  345   0.085/15    49.0    338     48.7  336   0.699/1     46.1    318     46.0  317   0.240/60    48.5    334     47.7  329   1.620/80    45.4    313     43.4  299   4.4 1/99    39.8    274     39.5  272   0.8N(CF.sub.3).sub.3 /HFC-245fa99.2/0.8 45.8    316     45.8  316   0.080/20    44.3    305     43.7  301   1.460/40    41.3    285     38.7  267   6.355/45    40.4    279     37.0  255   8.450/50    39.5    272     35.1  242   11.152/48    39.9    275     35.9  248   10.0N(CF.sub.3).sub.3 /HFC-254ca99.5/0.5 45.8    316     45.8  316   0.070/30    41.6    287     38.8  268   6.765/35    40.8    281     36.9  254   9.664/36    40.6    280     36.5  252   10.1N(CF.sub.3).sub.3 /HFC-254cb79.5/20.5    48.4    334     48.4  334   0.099/1     46.1    318     46.1  318   0.050/50    46.3    319     44.9  310   3.030/70    43.2    298     39.8  274   7.925/75    42.2    291     38.5  265   8.820/80    41.0    283     37.2  256   9.315/85    39.7    274     36.1  249   9.1 1/99    34.6    239     34.2  236   1.2N(CF.sub.3).sub.3 /HFC-254eb78.7/21.3    48.5    334     48.5  334   0.099/1     46.1    318     46.1  318   0.050/50    46.5    321     45.3  312   2.620/80    41.4    285     37.8  261   8.710/90    38.6    266     35.9  248   7.0 1/99    35.2    243     34.8  240   1.1N(CF.sub.3).sub.3 /HFC-263ca92.7/7.3 46.8    323     46.8  323   0.099/1     46.1    318     46.1  318   0.060/40    42.9    296     38.6  266   10.0N(CF.sub.3).sub.3 /HFC-263fb49.1/50.9    58.0    400     58.0  400   0.020/80    56.5    390     56.2  387   0.5 1/99    54.2    374     54.1  373   0.280/20    55.2    381     54.1  373   2.099/1     46.6    321     46.3  319   0.6N(CF.sub.3).sub.3 /HFC-272ca78.3/21.7    52.9    365     52.9  365   0.099/1     46.8    323     46.4  320   0.950/50    50.7    350     47.6  328   6.145/55    50.1    345     45.4  313   9.444/56    49.9    344     44.9  310   10.0N(CF.sub.3).sub.3 /HFC-272ea90.2/9.8 48.3    333     48.3  333   0.099/1     46.5    321     46.3  319   0.460/40    45.1    311     39.9  275   11.562/38    45.3    312     41.2  284   9.161/39    45.2    312     40.6  280   10.2N(CF.sub.3).sub.3 /HFC-272fb86.2/13.8    49.6    342     49.6  342   0.099/1     46.6    321     46.3  319   0.650/50    45.7    315     38.3  264   16.255/45    46.4    320     41.6  287   10.356/44    46.6    321     42.2  291   9.4N(CF.sub.3).sub.3 /HFC-281ea71.2/28.8    59.3    409     59.3  409   0.085/15    58.0    400     57.0  393   1.799/1     47.6    328     46.7  322   1.940/60    56.9    392     54.1  373   4.930/70    55.3    381     51.4  354   7.120/80    53.3    367     49.2  339   7.7 1/99    47.5    328     47.2  325   0.640/60    75.4    520     67.8  467   10.139/61    75.5    521     69.0  476   8.6 N(CF.sub.3).sub.3 /HFC-281fa79.3/20.7    55.5    383     55.5  383   0.099/1     47.4    327     46.7  322   1.550/50    53.0    365     48.7  336   8.145/55    52.3    361     46.3  319   11.547/53    52.6    363     47.3  326   10.148/52    52.7    363     47.8  330   9.3N(CF.sub.3).sub.3 /butane89.2/10.8    47.8    330     47.8  330   0.099/1     46.3    319     46.2  319   0.260/40    44.8    309     43.3  299   3.350/50    43.4    299     41.2  284   5.145/55    42.7    294     40.2  277   5.940/60    41.9    289     39.3  271   6.230/70    40.4    279     37.8  261   6.420/80    38.7    267     36.6  252   5.410/90    37.0    255     35.8  247   3.2 1/99    35.4    244     35.3  243   0.3N(CF.sub.3).sub.3 /cyclopropane38.3/61.7    108.3   747     108.3 747   0.015/85    107.1   738     106.6 735   0.5 1/99    105.2   725     105.1 725   0.160/40    106.9   737     105.6 728   1.280/20    100.1   690     90.6  625   9.581/19    99.3    685     89.0  614   10.4 N(CF.sub.3).sub.3 /DME59.0/41.0    102.9   709     102.9 709   0.080/20    100.4   692     94.6  652   5.883/17    99.0    683     89.9  620   9.284/16    98.4    678     87.9  606   10.740/60    102.2   705     99.4  685   2.730/70    101.2   698     91.5  631   9.629/71    101.0   696     90.7  625   10.2N(CF.sub.3).sub.3 /isobutane61.8/38.2    52.5    362     50.5  348   3.880/20    51.8    357     51.6  356   0.490/10    50.2    346     49.8  343   0.899/1     46.5    321     46.3  319   0.440/60    52.1    359     52.0  359   0.220/80    51.3    354     51.2  353   0.2 1/99    50.5    348     50.5  348   0.0N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ca50.4/49.6    15.0    103     15.0  103   0.075/25    14.7    101     14.7  101   0.099/1     14.0     97     14.0   97   0.025/75    14.8    102     14.7  101   0.7 1/99    14.2     98     14.2   98   0.0N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ea50.5/49.5    14.9    103     14.9  103   0.025/75    14.7    101     14.7  101   0.0 1/99    14.2     98     14.2   98   0.075/25    14.7    101     14.6  101   0.799/1     14.0     97     14.0   97   0.0N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245eb3.3/96.7 16.9    117     16.9  117   0.0 1/99    16.9    117     16.9  117   0.040/60    16.6    114     16.5  114   0.670/30    15.7    108     15.5  107   1.390/10    14.6    101     14.5  100   0.799/1     14.0     97     14.0   97   0.0N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-254ca59.1/40.9    15.2    105     15.2  105   0.080/20    14.9    103     14.9  103   0.099/1     14.0     97     14.0   97   0.040/60    15.0    103     15.0  103   0.020/80    14.5    100     14.4   99   0.7 1/99    13.8     95     13.7   94   0.7N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-263ca27.6/72.4    18.6    128     18.6  128   0.015/85    18.5    128     18.5  128   0.0 1/99    18.3    126     18.3  126   0.060/40    18.0    124     17.8  123   1.180/20    16.8    116     16.3  112   3.099/1     14.1     97     14.0   97   0.7N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-272ea20.1/79.9    20.9    144     20.9  144   0.0 1/99    20.8    143     20.8  143   0.050/50    20.5    141     20.3  140   1.080/20    18.4    127     17.4  120   5.499/1     14.3     99     14.1   97   1.4N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ca54.7/45.3    15.0    103     15.0  103   0.080/20    14.7    101     14.7  101   0.099/1     14.2     98     14.2   98   0.020/80    14.6    101     14.6  101   0.0 1/99    14.2     98     14.2   98   0.0N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ea55.2/44.8    14.9    103     14.9  103   0.080/20    14.7    101     14.7  101   0.099/1     14.2     98     14.2   98   0.025/75    14.7    101     14.6  101   0.7 1/99    14.2     98     14.2   98   0.0N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-254ca62.4/37.6    15.2    105     15.2  105   0.080/20    15.0    103     15.0  103   0.099/1     14.2     98     14.2   98   0.040/60    15.0    103     14.9  103   0.720/80    14.5    100     14.4   99   0.71/99     13.8     95     13.7   94   0.7N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-263ca26.5/73.5    18.5    128     18.5  128   0.0 1/99    18.3    126     18.3  126   0.060/40    18.0    124     17.8  123   1.180/20    16.8    116     16.4  113   2.499/1     14.4     99     14.3   99   0.7N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-272ea17/83    20.9    144     20.9  144   0.0 1/99    20.8    143     20.8  143   0.050/50    20.4    141     20.2  139   1.080/20    18.4    127     17.5  121   4.999/1     14.5    100     14.3   99   1.4______________________________________ 
    
     The results of this Example show that these compositions are azeotropic or azeotrope-like because when 50 wt. % of an original composition is removed, the vapor pressure of the remaining composition is within about 10% of the vapor pressure of the original composition, at a temperature of 25° C. 
     EXAMPLE 3 
     Refrigerant Performance 
     The following table shows the performance of various refrigerants in an ideal vapor compression cycle. The data are based on the following conditions. 
     
         ______________________________________Evaporator temperature                45.0° F.                         (7.2° C.)Condenser temperature                130.0° F.                         (54.4° C.)Liquid subcooled     15° F.                         (8.3° C.)Return Gas           75° F.                         (23.9° C.)Compressor efficiency is 75%.______________________________________ 
    
     The refrigeration capacity is based on a compressor with a fixed displacement of 3.5 cubic feet per minute and 75% volumetric efficiency. Capacity is intended to mean the change in enthalpy of the refrigerant in the evaporator per pound of refrigerant circulated, i.e. the heat removed by the refrigerant in the evaporator per time. Coefficient of performance (COP) is intended to mean the ratio of the capacity to compressor work. It is a measure of refrigerant energy efficiency. 
     
         __________________________________________________________________________         Evap. Cond.   Comp.     CapacityRefrig.       Press.               Press.  Dis. Temp.                                 BTU/minComp.         Psia            kPa               Psia                   kPa °F.                           °C.                              COP                                 kw__________________________________________________________________________N(CF.sub.3).sub.3 /HFC-23*1/99         99.4            685               547.0                   3771                       185.4                           85.2                              1.90                                 314.1                                     5.5*4.3/95.7     87.3            602               527.6                   3638                       191.8                           88.8                              1.86                                 285.3                                     5.0**99/1        29.0            200               121.7                   839 142.0                           61.1                              3.26                                 113.4                                     2.0*condenser temp. = 60° F. (15.6° C.), Evaporator temp. =-40° F. (-40.0° C.), Subcooltemp. = 50/50° F. (8.3° C.), Return gas temp. = -20°F/ (-28.9° C.).**Return gas = 75° F. (23.9° C.).N(CF.sub.3).sub.3 /HFC-32*1/99         150.4            1037               451.4                   3112                       194.8                           90.4                              3.68                                 543.5                                     9.635.0/65.0     164.6            1135               464.0                   3199                       177.1                           80.6                              3.41                                 504.4                                     8.999/1          31.3            216               128.0                   883 141.8                           61.0                              3.43                                 126.0                                     2.2*Condenser temp. 120° F. (48.9° C.), Subcool temp.15° F. (8.3° C.).N(CF.sub.3).sub.3 /HFC-134a 1/99         54.8            378               214.8                   1481                       180.7                           82.6                              3.33                                 218.8                                     3.927.7/72.3     59.3            409               225.7                   1556                       170.6                           77.0                              3.17                                 215.6                                     3.899/1          26.4            182               114.4                   789 141.9                           61.1                              3.02                                 98.2                                     1.7N(CF.sub.3).sub.3 /HFC-152a 1/99         51.0            352               193.9                   1337                       214.0                           101.1                              3.52                                 219.0                                     3.949.2/50.8     48.0            331               213.2                   1470                       181.8                           83.2                              3.28                                 216.4                                     3.899/1          26.9            185               115.9                   799 142.3                           61.3                              3.06                                 100.9                                     1.8N(CF.sub.3).sub.3 /HFC-161 1/99         79.9            551               280.4                   1933                       211.1                           99.5                              3.40                                 309.0                                     5.445.7/54.3     86.1            594               295.4                   2037                       188.0                           86.7                              3.17                                 294.8                                     5.299/1          28.5            197               120.9                   834 142.6                           61.4                              3.16                                 109.0                                     1.9N(CF.sub.3).sub.3 /HFC-236cb 1/99         18.3            126               79.9                   551 155.4                           68.6                              3.41                                 80.5                                     1.488.2/11.8     24.2            167               105.2                   725 142.9                           61.6                              3.07                                 92.3                                     1.699/1          25.2            174               109.8                   757 141.4                           60.8                              2.99                                 93.3                                     1.6N(CF.sub.3).sub.3 /HFC-236ea 1/99         15.3            105               70.4                   485 160.2                           71.2                              3.49                                 72.0                                     1.382.2/17.8     23.2            160               102.0                   703 144.5                           62.5                              3.13                                 91.3                                     1.699/1          25.2            174               109.8                   757 141.4                           60.8                              2.99                                 93.3                                     1.6N(CF.sub.3).sub.3 /HFC-236fa 1/99         20.2            139               869.0                   5992                       154.9                           68.3                              3.39                                 87.0                                     1.566.9/33.1     23.3            161               100.9                   696 145.9                           63.3                              3.17                                 92.3                                     1.6  1/99        25.3            174               109.9                   758 141.4                           60.8                              2.99                                 93.4                                     1.6N(CF.sub.3).sub.3 /HFC-245fa 1/99         11.3             78               54.2                   374 164.7                           73.7                              3.60                                 56.8                                     1.099.2/0.8      25.2            174               109.7                   756 141.5                           60.8                              2.99                                 93.1                                     1.6N(CF.sub.3).sub.3 /HFC-254ca 1/99         6.9             48               35.7                   246 171.4                           77.4                              3.72                                 38.0                                     0.799.5/0.5      25.1            173               109.8                   757 141.5                           60.8                              2.98                                 93.0                                     1.6N(CF.sub.3).sub.3 /HFC-254cb  1/99        18.6            128               80.2                   553 164.4                           73.6                              3.53                                 85.1                                     1.579.5/20.5     24.6            170               105.4                   727 146.4                           63.6                              3.16                                 96.4                                     1.799/1          25.4            175               110.1                   759 141.5                           60.8                              2.99                                 93.7                                     1.6N(CF.sub.3).sub.3 /HFC-254eb 1/99         19.0            131               81.4                   561 164.3                           73.5                              3.53                                 86.4                                     1.578.7/21.3     24.7            170               105.6                   728 146.6                           63.7                              3.16                                 96.9                                     1.799/1          25.4            175               110.1                   759 141.5                           60.8                              2.99                                 93.7                                     1.6N(CF.sub.3).sub.3 /HFC-263ca 1/99         9.5             66               45.2                   312 172.3                           77.9                              3.70                                 49.5                                     0.992.7/7.3      23.6            163               103.0                   710 143.7                           62.1                              3.12                                 91.9                                     1.699/1          25.1            173               109.4                   754 141.6                           60.9                              2.99                                 93.1                                     1.6N(CF.sub.3).sub.3 /HFC-263fb 1/99         30.6            211               120.2                   829 164.6                           73.7                              3.45                                 126.6                                     2.249.1/50.9     31.2            215               124.7                   860 155.0                           68.3                              3.28                                 122.0                                     2.199/1          25.6            177               111.1                   766 141.7                           60.9                              2.98                                 94.3                                     1.7N(CF.sub.3).sub.3 /HFC-272ca 1/99         19.2            132               78.8                   543 170.3                           76.8                              3.63                                 87.8                                     1.578.3/21.7     25.5            176               106.2                   732 149.5                           65.3                              3.25                                 101.5                                     1.899/1          25.5            176               110.4                   761 141.7                           60.9                              3.00                                 94.1                                     1.7N(CF.sub.3).sub.3 /HFC-272ea 1/99         10.9             75               51.4                   354 181.0                           82.8                              3.74                                 57.4                                     1.090.2/9.8      24.8            171               106.5                   734 145.8                           63.2                              3.14                                 96.6                                     1.799/1          25.4            175               110.2                   760 141.7                           60.9                              3.00                                 94.0                                     1.7N(CF.sub.3).sub.3 /HFC-272fb 1/99         14.1             97               63.9                   441 178.6                           81.4                              3.70                                 71.2                                     1.386.2/13.8     25.6            177               108.7                   749 147.5                           64.2                              3.17                                 100.3                                     1.899/1          25.5            176               110.6                   763 141.7                           60.9                              3.00                                 94.3                                     1.7N(CF.sub.3).sub.3 /HFC-281ea 1/99         26.6            183               105.2                   725 177.9                           81.1                              3.61                                 118.3                                     2.171.2/28.8     31.8            219               126.1                   869 156.2                           69.0                              3.30                                 124.6                                     2.299/1          25.9            179               112.3                   774 142.1                           61.2                              2.99                                 95.6                                     1.7N(CF.sub.3).sub.3 /HFC-281fa 1/99         20.8            143               87.0                   600 179.5                           81.9                              3.65                                 97.6                                     1.779.3/20.7     28.8            199               117.9                   813 152.7                           67.1                              3.25                                 113.3                                     2.099/1          25.8            178               111.7                   770 142.0                           61.1                              2.99                                 95.2                                     1.7N(CF.sub.3).sub.3 /butane 1/99         19.6            135               80.9                   558 165.3                           74.1                              3.57                                 88.3                                     1.689.2/10.8     26.0            179               109.3                   754 145.9                           63.3                              3.15                                 100.2                                     1.899/1          25.5            176               110.5                   762 141.7                           60.9                              3.00                                 94.4                                     1.7N(CF.sub.3).sub.3 /cyclopropane 1/99         62.7            432               215.4                   1485                       209.5                           98.6                              3.59                                 254.0                                     4.538.3/61.7     69.0            476               234.6                   1618                       192.5                           89.2                              3.45                                 260.0                                     4.699/1          28.3            195               119.9                   827 142.7                           61.5                              3.13                                 107.3                                     1.9N(CF.sub.3).sub.3 /DME 1/99         48.7            336               182.8                   1260                       203.4                           95.2                              3.60                                 210.7                                     3.759.0/41.0     61.4            423               221.6                   1528                       175.7                           79.8                              3.25                                 222.9                                     3.999/1          28.1            194               119.4                   823 142.5                           61.4                              3.12                                 106.3                                     1.9N(CF.sub.3).sub.3 /isobutane 1/99         29.1            201               110.3                   760 162.0                           72.2                              3.47                                 118.3                                     2.161.8/38.2     29.3            202               115.4                   796 153.5                           67.5                              3.31                                 114.8                                     2.099/1          25.6            177               110.9                   765 141.8                           61.0                              2.99                                 94.6                                     1.7N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245ca 1/99         7.0             48               36.6                   252 168.1                           75.6                              3.67                                 38.3                                     0.750.4/49.6     7.0             48               37.6                   259 161.2                           71.8                              3.61                                 37.9                                     0.799/1          6.7             46               38.1                   263 153.8                           67.7                              3.52                                 36.5                                     0.6N(CHF.sub. 2).sub.2 (CF.sub.3)/HFC-245ea 1/99         6.9             48               37.2                   256 173.1                           78.4                              3.69                                 38.9                                     0.750.5/49.5     7.0             48               38.2                   263 163.5                           73.1                              3.62                                 38.5                                     0.799/1          6.7             46               38.1                   263 153.9                           67.7                              3.52                                 36.5                                     0.6N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-245eb 1/99         8.5             59               42.9                   296 166.7                           74.8                              3.64                                 44.9                                     0.8 3.3/96.7     8.4             58               42.8                   295 166.5                           74.7                              3.64                                 44.7                                     0.899/1          6.8             47               38.1                   263 153.8                           67.7                              3.52                                 36.6                                     0.6N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-254ca 1/99         6.7             46               35.2                   243 171.7                           77.6                              3.70                                 37.3                                     0.759.1/40.9     6.9             48               37.2                   256 161.9                           72.2                              3.61                                 37.5                                     0.799/1          6.7             46               38.1                   263 153.9                           67.7                              3.53                                 36.5                                     0.6N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-263ca 1/99         9.3             64               44.7                   308 172.5                           78.1                              3.69                                 48.9                                     0.927.6/72.4     8.9             61               44.0                   303 168.6                           75.9                              3.66                                 47.0                                     0.899/1          6.8             47               38.2                   263 154.0                           67.8                              3.52                                 36.7                                     0.6N(CHF.sub.2).sub.2 (CF.sub.3)/HFC-272ea 1/99         10.7              74               50.8                   350 181.2                           82.9                              3.72                                 56.4                                     1.020.1/79.9     10.5             72               50.5                   348 177.3                           80.7                              3.70                                 55.2                                     1.099/1          6.8             47               38.5                   265 154.2                           67.9                              3.52                                 37.0                                     0.7N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ca 1/99         7.0             48               36.6                   252 168.1                           75.6                              3.67                                 38.3                                     0.754.7/45.3     7.2             50               38.1                   263 158.5                           70.3                              3.58                                 38.3                                     0.799/1          6.9             48               38.1                   263 150.4                           65.8                              3.49                                 36.5                                     0.6N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-245ea 1/99         6.9             48               37.2                   256 173.1                           78.4                              3.69                                 38.9                                     0.755.2/44.8     7.2             50               38.8                   268 160.4                           71.3                              3.59                                 38.9                                     0.799/1          6.9             48               38.2                   263 150.5                           65.8                              3.49                                 36.5                                     0.6N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-254ca 1/99         6.7             46               35.2                   243 171.6                           77.6                              3.70                                 37.3                                     0.762.4/37.6     7.1             49               37.8                   261 159.0                           70.6                              3.59                                 38.0                                     0.799/1          6.9             48               38.1                   263 150.5                           65.8                              3.49                                 36.5                                     0.6N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-263ca 1/99         9.4             65               44.8                   309 172.5                           78.1                              3.69                                 48.9                                     0.926.5/73.5     9.1              63               44.5                   307 167.7                           75.4                              3.66                                 47.5                                     0.899/1          7.0             48               38.3                   264 150.6                           65.9                              3.49                                 36.7                                     0.6N(CH.sub.2 F)(CF.sub.3).sub.2 /HFC-272ea 1/99         10.7             74               50.9                   351 181.2                           82.9                              3.72                                 56.5                                     1.017.0/83.0     10.7             74               51.0                   352 177.3                           80.7                              3.70                                 55.9                                     1.099/1          7.1             49               38.6                   266 150.7                           65.9                              3.49                                 37.1                                     0.7__________________________________________________________________________ 
    
     The novel compositions of this invention, including the azeotropic or azeotrope-like compositions, may be used to produce refrigeration by condensing the compositions and thereafter evaporating the condensate in the vicinity of a body to be cooled. The novel compositions may also be used to produce heat by condensing the refrigerant in the vicinity of the body to be heated and thereafter evaporating the refrigerant. 
     In addition to refrigeration applications, the novel constant boiling or substantially constant boiling compositions of the invention are also useful as aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and power cycle working fluids. 
     ADDITIONAL COMPOUNDS 
     Other components, such as aliphatic hydrocarbons having a boiling point of -60° to +30° C., hydrofluorocarbonalkanes having a boiling point of -60° to +30° C., hydrofluoropropanes having a boiling point of between -60° to +30° C., hydrocarbon esters having a boiling point between -60° to +30° C., hydrochlorofluorocarbons having a boiling point between -60° to +30° C., hydrofluorocarbons having a boiling point of -60° to +30° C., hydrochlorocarbons having a boiling point between -60° to +30° C., chlorocarbons and perfluorinated compounds, can be added to the azeotropic or azeotrope-like compositions described above. 
     Additives such as lubricants, corrosion inhibitors, stabilizers, dyes and other appropriate materials may be added to the novel compositions of the invention for a variety of purposes provides they do not have an adverse influence on the composition for its intended application. Preferred lubricants include esters having a molecular weight greater than 250.