US2006151740A1PendingUtilityA1

Chiller refrigerants

Individually held — no corporate assignee on recordPriority: Nov 29, 2002Filed: Dec 1, 2003Published: Jul 13, 2006

Est. expiryNov 29, 2022(expired)· nominal 20-yr term from priority

Inventors:Neil Andre Roberts Owen Ross Chambers

C09K 5/04C09K 5/045

PatentIndex Score

Cited by

References

Claims

Abstract

Refrigerant composition are described which include: (a) pentafluoroethane, trifluoromethoxydifluoromethane or hexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount of from 60 to 70% by weight based on the weight of the composition, (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluoropropane or a mixture of two or more thereof, in an amount of from 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, with a boiling point from −12° C. to +10° C., or a mixture thereof, or a mixture of one or more said hydrocarbons with one or more other hydrocarbons, said mixture having a bubble point from −12° C. to +10° C., in an amount from 1% to 4% by weight based on the weight of the composition.

Claims

exact text as granted — not AI-modified

1 . A refrigerant composition which comprises: 
 (a) pentafluoroethane, trifluoromethoxydifluoromethane or hexafluoro-cyclopropane, or a mixture of two or more thereof, in an amount of from 60 to 70% by weight based on the weight of the composition,    (b) 1,1,1,2- or 1,1,2,2-tetrafluoroethane, trifluoromethoxypentafluoroethane, 1,1,1,2,3,3-heptafluororopane or a mixture of two or more thereof, in an amount of from 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, with a boiling point from −12° C. to +10° C., or a mixture thereof, or a mixture of one or more said hydrocarbon with one or more other hydrocarbons, said mixture having a bubble point from −12° C. to +10° C., in an amount from 1% to 4% by weight based on the weight of the composition.    
   
   
       2 . A composition according to  claim 1  in which component (c) is present in an amount from 3 to 4% by weight based on the weight of the composition.  
   
   
       3 . A composition according to  claim 2  in which component (c) is present in an amount of about 3.5% by weight based on the weight of the composition.  
   
   
       4 . A composition according to  claim 1 , in which component (c) is n-butane and/or isobutane.  
   
   
       5 . A composition according to  claim 4  in which component (c) is n-butane.  
   
   
       6 . A composition according to  claim 1 , in which component (c) is a mixture of n-butane and/or isobutane with another hydrocarbon.  
   
   
       7 . A composition according to  claim 1 , in which component (a) is pentafluoroethane.  
   
   
       8 . A composition according to  claim 1 , in which component (a) is present in an amount from 62 to 67% by weight based on the weight of the composition.  
   
   
       9 . A composition according to  claim 8  in which component (a) is present in an amount above 64 up to 66% weight based on the weight of the composition.  
   
   
       10 . A composition according to  claim 1 , in which component (b) is 1,1,1,2-tetrafluoroethane.  
   
   
       11 . A composition according to  claim 1 , in which component (b) is present in an amount from 28 to 32% by weight based on the weight of the composition.  
   
   
       12 . A composition according to  claim 1 , in which the weight ratio of component (a): component (b) is at least 1.5:1.  
   
   
       13 . A composition according to  claim 12  in which the said weight ratio is 1.5:1 to 3:1.  
   
   
       14 . A composition according to  claim 1 , which comprises, as component (a), 62 to 67 pentafluoroethane, as component (b), 3 to 35% by weight based on the weight of the composition 1,1,1,2-tetrafluoroethane, and as component (c), butane and/or isobutane, or a mixture of hydrocarbons comprising butane and/or isobutane.  
   
   
       15 . A composition according to  claim 1 , which comprises a further component.  
   
   
       16 . A composition according to  claim 15  in which the further component is a hydrofluorocarbon.  
   
   
       17 . A composition according to  claim 16  in which the hydrofluorocarbon has a boiling point at atmospheric pressure of at most −40° C.  
   
   
       18 . A composition according to  claim 16  in which the F/H ratio in the hydrofluorocarbon is at least 1.  
   
   
       19 . A composition according to  claim 18  in which the hydrofluorocarbon is difluoromethane or trifluoromethane.  
   
   
       20 . A composition according to  claim 15 , in which the further component is present in an amount not exceeding 5% by weight based on the weight of (a), (b) and (c).  
   
   
       21 . A composition according to  claim 20  in which the further component is present in an amount not exceeding 2% by weight based on the weight of (a), (b) and (c).  
   
   
       22 . (canceled)  
   
   
       23 . (canceled)  
   
   
       24 . The process for producing refrigeration which comprises condensing a composition as claimed in  claim 1 , and thereafter evaporating the composition in the vicinity of a body to be cooled.  
   
   
       25 . A refrigeration apparatus containing, as refrigerant, a composition as claimed in  claim 1.

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