Patent GB-614626-A (GB)
Title: Improved process for inhibiting the formation of froth in chemical processes
IPC: B01D19/04
Filed: 1944-08-31
Abstract: Water or aqueous alcohols are removed from spumiferous materials containing them by heating the material with the addition of a small amount of a compound having the formula <FORM:0614626/III/1> in which R1 represents alkyl, aryl, cyclic, oxyalkyl or oxyaryl monovalent hydrocarbon radicals or their halogenated derivatives, R is preferably hydrogen, but may be the same as R1, and n is an integer from 0-50, whereby foaming is prevented.  The water or aqueous alcohol may be removed by boiling at atmospheric pressure.  Specified spumiferous materials are soaps, alkali or alkaline earth metal sulphonates, metal soap greases, metal salts of alkylated phenol sulphides or their derivatives, suspensions or latices of synthetic elastomers produced by emulsion polymerization, sugars, glycerine, adhesives, esters, glycols and organo-metallic compounds.  Specified silicon compounds are dimethyl silicone, methyl phenyl silicone, ethyl butyl silicone, chlorobutyl silicone, methyl cyclohexyl silicone, dicyclohexylsilicone, diphenyl silicone, hydroxy phenyl methyl silicone, phenyl ethyl silicone, phenyl propyl silicone, phenyl isopropyl silicone, tolyl butyl silicone, tolyl amyl silicone, xylyl isopropyl silicone, xylyl methyl silicone, phenyl hydroxy ethyl silicone, xylyl hydroxypropyl silicone, tolyl hydroxypropyl silicone, hydroxyphenyl hexyl silicone, phenyl stearyl silicone, phenyl oleyl silicone, tri-chlor-phenyl silicone, fluoro phenyl silicone and chloro-naphthyl silicone.  According to examples: (1) a lubricating grease is prepared by heating to 275-300 DEG  F. a mixture of sperm oil, mineral oil, hydrated lime and "silicone" oil, i.e. Si2O (C6H5)2(C2H5)2(OH)2 to complete saponification, small amounts of the mineral oil being added intermittently to facilitate stirring, adding further mineral oil, lowering the temperature to 210 DEG  F., and adding further water to complete grease formation; (2) petrolatum, hydrogenated fish oil, hydrated lime and "silicone" oil are heated to 350 DEG  F. until the mixture is homogeneous; (5) refined rape seed oil, commercial sodium petroleum sulphonates and a naphthenic base mineral oil are heated with stirring to 150 DEG  F., "silicone oil" and aqueous sodium hydroxide are added, the temperature is kept at 200 DEG  F. until saponification is completed, the temperature is raised to remove water, further mineral oil is added, the temperature is raised to 500 DEG  F., and the resulting grease is cooled with stirring to 180 DEG  F.; (6) hydrogenated fish oil acids, and a naphthenic type mineral oil are heated with stirring to 150 DEG  F., "silicone" oil and a boiling aqueous solution of lithium hydroxide is added, the temperature is raised to 210-215 DEG  F. and subsequently to 300 DEG  F. with the addition of further mineral oil, further oil containing aluminium stearate and zinc naphthenate is added, the temperature is raised to 400 DEG  F., and the resulting grease is allowed to cool.  Specifications 542,655, 544,143, 548,911, 548,912, 549,081, [all in Group IV], and 591,767 are referred to.ALSO:Foaming is prevented in the stripping of suspensions or latices of synthetic elastomers produced by emulsion polymerization by the addition of a small amount of a compound having the formula <FORM:0614626/IV(a)/1> in which R1 represents alkyl, aryl, cyclic, oxyalkyl or oxyaryl monovalent hydrocarbon radicals or their halogenated derivatives, R is preferably hydrogen, but may be the same as R1, and n is an integer from 0-50.  Specifications 542,655, 544,143, 548,911, 548,912, 549,081 and 591,767, [Group III], are referred to.ALSO:Foaming is prevented in the preparation of alkali metal sulphonates and metal phenol sulphonates by the addition of a small amount of a compound having the formula <FORM:0614626/IV(b)/1> in which R1 represents alkyl, aryl, cyclic, oxy-alkyl or oxyaryl monovalent hydrocarbon radicals or their halogenated derivatives, R is preferably hydrogen, but may be the same as R1, and n is an integer from 0-50.  According to examples: (3) calcium petroleum sulphonate is prepared by emulsifying an oil solution of the sodium sulphonate with dilute aqueous calcium chloride and driving off the water by heating to 300 DEG  F. in the presence of a trace of "silicone oil" <FORM:0614626/IV(b)/2> ; (4) a mineral oil solution of barium tertiary octyl phenol sulphide is prepared by reacting barium hydroxide with a mineral oil solution of tertiary octyl phenol sulphide in the presence of "silicone oil."  Specifications 542,655, 544,143, 548,911, 548,912, 549,081 and 591,767, [Group III], are referred to.