Chiller refrigerants

Abstract

Disclosed is a nonflammable refrigerant composition consisting of pentafluoroethane in an amount from 62% to 67% based on the weight of the composition, a second component that is selected from 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, and mixtures thereof in an amount from 26% to 36% by weight; and an ethylenically unsaturated or saturated hydrocarbon compound that is at least 70% isobutane in an amount of from 1% to 4% by weight and up to 5% by weight based on the weight of the composition of another flurohydrocarbon. The composition optionally may further include at least one additive, lubricant or combination thereof.

1 - 25 . (canceled) 
     
     
         26 . A refrigerant composition wherein the refrigerant component consists essentially of:
 (a) pentafluoroethane in an amount from 60% to 70% by weight based on the weight of the refrigerant component;   (b) 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane or a mixture thereof in an amount from 26% to 36% by weight based on the weight of the refrigerant component; and   (c) from 1% to 4% by weight based on the weight of the refrigerant component of a hydrocarbon-containing component selected from the group consisting of isobutane, n-pentane, isopentane and mixtures thereof;   (d) up to 2% by weight based on the weight of the composition of another fluorocarbon wherein the other fluorocarbon is selected from the group consisting of trifluoromethane, difluoromethane and mixtures thereof;   
       said refrigerant composition optionally comprising
 (e) at least one lubricant; and optionally comprising 
 (f) at least one additive selected from the group consisting of extreme pressure additives, antiwear additives, oxidation and thermal stability improvers, corrosion inhibitors, viscosity index improvers, pour point depressants, detergents, anti-foaming agents, and viscosity adjusters. 
 
     
     
         27 . The refrigerant composition of  claim 26 , wherein he weight ratio of component (a): component (b) is desirably at least 1.5:1. 
     
     
         28 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b), (c), (d) and (e). 
     
     
         29 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b), (c), (d), (e) and (f). 
     
     
         30 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b), (c) and (d). 
     
     
         31 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b), (c) and (e). 
     
     
         32 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b), (c) and (f). 
     
     
         33 . The refrigerant composition of  claim 26  consisting essentially of components (a), (b) and (c). 
     
     
         34 . The refrigerant composition of  claim 26  wherein component (a) is present in an amount about 62% to about 67% by weight based on the weight of the composition. 
     
     
         35 . The refrigerant composition of  claim 26  wherein component (b) is present in an amount about 28% to about 32% by weight based on the weight of the composition. 
     
     
         36 . The refrigerant composition of  claim 26  wherein component (e) is present and comprises at least one lubricant selected from the group consisting of mineral oils, alkylbenzene lubricants, synthetic lubricants, and fluorinated oils and mixtures thereof. 
     
     
         37 . The refrigerant composition of  claim 26  wherein component (b) is a mixture of 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane and is at least half 1,1,1,2-tetrafluoroethane. 
     
     
         38 . A refrigeration apparatus containing, as refrigerant, a refrigerant composition of  claim 26 .