Patent ID: 6521141
Filing Date: 2003-02-18
Classification: C09K

Abstract:
A non-azeotropic refrigerant composition having a vapor pressure at âˆ’20Â° C. of from 70 to 190 kPa (0.7 to 1.9 bar), at +20Â° C. of from 510 to 630 kPa (5.1 to 6.3 bar) and at +60Â° C. of from 1620 to 1740 kPa (16.2 to 17.4 bar), which composition comprises:(a) 1,1,2,2-tetrafluoroethane (R134), 1,1,1,2-tetrafluoroethane (R134a), difluoromethoxytrifluoromethane (E125) or a mixture of two or more thereof, in an amount of from 60 to 95% by weight, based on the weight of the composition; (b) from 1 to 10% by weight, based on the weight of the composition, of an unsubstituted hydrocarbon of the formula CnHm in which n is from 4 to 6 and m is at least 2nâˆ’2; and, (c) a vapor pressure depressant comprising at least one of 1,1-difluoroethane, 1,1,1,2,2-pentafluoropropane, 1,1,2,2,3-pentafluoropropane, trifluoromethoxymethane, fluoromethoxytrifluoromethane, difluoromethoxymethane, pentafluoroethoxypentafluoroethane, difluoromethoxydifluoromethane, trifluoromethoxy-2,2,2-trifluoroethane, fluoromethoxymethane, difluoromethoxy-1,2,2,2-tetrafluoroethane, fluoromethoxyfluoromethane, difluoromethoxy-2,2,2-trifluoroethane, methoxy-2,2,2-trifluoroethane, and methoxy-1,1,2,2-tetrafluoroethane.