Refrigerant compositions

Abstract

Refrigerant compositions are provided which include: (a) pentafluoroethane or trifluoromethoxydifluoromethane or hexafluorocyclopropane or mixtures thereof, in an amount from about 60 to about 70% by weight based on the weight of the composition; (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane or trifluoromethoxypentafluoroethane or 1,1,1,2,3,3 -heptafluoropropane or mixtures thereof, in an amount from about 26 to 36% by weight based on the weight of the composition; and (c) an ethylenically unsaturated or saturated hydrocarbon, optionally containing one or more oxygen atoms, having a boiling point from −12° C. to +10° C., or a mixture thereof, or a mixture of one or more of the hydrocarbons with one or more other hydrocarbons or ethers, said mixture having a bubble point from −12° C. to +10° C., in an amount from about 1% to 4% by weight based on the weight of the composition. Also provided is a process of refrigeration using the refrigerant compositions and a refrigeration apparatus containing the refrigerant compositions.

1 - 23 . (canceled)  
     
     
         24 . A nonflammable composition consisting of: 
 (a) pentafluoroethane in an amount from 62-67% by weight based on the weight of the composition;    (b) 1,1,1,2-tetrafluoroethane in an amount from 26 to 36% by weight based on the weight of the composition;    (c) isobutane in an amount of from 1-4% by weight based on the weight of the composition; and    (d) at least one lubricant.    
     
     
         25 . A nonflammable composition consisting of: 
 (a) pentafluoroethane in an amount of from 62% to 67% by weight based on the weight of the composition;    (b) 1,1,1,2-tetrafluoroethane in an amount of from 26% to 36% by weight based on the weight of the composition;    (c) isobutane in an amount of from 3-4% by weight based on the weight of the composition;    (d) at least one lubricant; and    (e) at least one additive.    
     
     
         26 . A nonflammable composition consisting of: 
 (a) pentafluoroethane in an amount from 62% to 67% by weight based on the weight of the composition;    (b) 1,1,1,2-tetrafluoroethane in an amount of from 26% to 36% by weight based on the weight of the composition;    (c) isobutane in an amount of from 3-4% by weight based on the weight of the composition; and    (d) at least one additive.    
     
     
         27 . The composition according to  claim 24 ,  25  or  26  in which component (c) is isobutene present in an amount of about 3.5% by weight based on the weight of the composition.  
     
     
         28 . The composition according to  claim 24 ,  25  or  26  in which component (b) is present in an amount about 28% to about 32% by weight based on the weight of the composition.