Use of low gwp refrigerants comprising cf3i with stable lubricants

Abstract

The invention pertains to heat transfer compositions, particularly to automobile refrigerants comprising a hydrofluoroalkene, an iodocarbon, and at least one lubricant having hydrogen atoms and carbon atoms, wherein no more than 17% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms.

1 . A composition comprising a hydrofluoroalkene, an iodocarbon, and at least one lubricant having at least one hydrogen atom and at least one carbon atom, wherein no more than 17% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms. 
     
     
         2 . The composition of  claim 1  wherein less than 1% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms. 
     
     
         3 . The composition of  claim 1  wherein about 0% of the total number of hydrogen atoms which are attached to a carbon atom are tertiary hydrogen atoms. 
     
     
         4 . The composition of  claim 1  further comprising a hydrofluoroalkane. 
     
     
         5 . The composition of  claim 1  further comprising a hydrofluoroalkane which comprises at least one of difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane, trifluorethane or combinations thereof. 
     
     
         6 . The composition of  claim 1  wherein the iodocarbon comprises at least one iodofluorocarbon. 
     
     
         7 . The composition of  claim 1  wherein the iodocarbon comprises at least one C 1 -C 3  iodofluorocarbon. 
     
     
         8 . The composition of  claim 1  wherein the iodocarbon comprises at least one C 1 -C 2  iodocarbon. 
     
     
         9 . The composition of  claim 1  wherein the iodocarbon comprises trifluoromethyl iodide. 
     
     
         10 . The composition of  claim 1  further comprising a compound comprising trifluoromethane, methyl iodide, heptafluorobutane or propene. 
     
     
         11 . The composition of  claim 10  wherein the compound is present in an amount of from greater than zero to about 1% by weight of the composition. 
     
     
         12 . The composition of  claim 10  wherein the compound is present in an amount of from about 0.01% to about 1% by weight of the composition. 
     
     
         13 . The composition of  claim 1  wherein the hydrofluoroalkene comprises a tetrafluoroalkene. 
     
     
         14 . The composition of  claim 1  wherein the hydrofluoroalkene comprises 1,1,1,2-tetrafluoropropene. 
     
     
         15 . The composition of  claim 1  wherein the hydrofluoroalkene comprises trans-1,3,3,3-tetrafluoropropene. 
     
     
         16 . The composition of  claim 1  wherein the hydrofluoroalkene comprises 1,1,3,3,3-pentafluoropropene. 
     
     
         17 . The composition of  claim 1  wherein the hydrofluoroalkene comprises 1,2,3,3,3-pentafluoropropene. 
     
     
         18 . The composition of  claim 1  wherein the hydrofluoroalkene comprises 1,1,1,2-tetrafluoropropene, the iodocarbon comprises trifluoromethyl iodide and the compound comprises two or more of trifluoromethane, methyl iodide, heptafluorobutane or propene. 
     
     
         19 . The composition of  claim 1  wherein the hydrofluoroalkene comprises 1,1,1,2-tetrafluoropropene, the iodocarbon comprises trifluoromethyl iodide, and the compound comprises and each of trifluoromethane, methyl iodide, heptafluorobutane and propene. 
     
     
         20 . The composition of  claim 1  wherein the lubricant comprises a naphthenic mineral oil, a paraffinic mineral oil, an ester oil, a polyalkylene glycol, a polyvinyl ether, an alkyl benzene, a polyalphaolefin, a polyester, or combinations thereof. 
     
     
         21 . The composition of  claim 19  wherein the lubricant comprises a naphthenic mineral oil, a paraffinic mineral oil, an ester oil, a polyalkylene glycol, a polyvinyl ether, an alkyl benzene, a polyalphaolefin, a polyester, or combinations thereof. 
     
     
         22  A refrigerant comprising the composition of  claim 1 . 
     
     
         23 . A heat transfer composition comprising the composition of  claim 1 . 
     
     
         24 . An automobile air conditioning system comprising the composition of  claim 1 . 
     
     
         25 . A heat transfer system comprising:
 (a) a heat transfer composition comprising the composition of  claim 1 ; and   (b) one or more vessels containing and/or in contact with at least a portion of the heat transfer composition.   
     
     
         26 . A method of transferring heat to or from a fluid or body comprising contacting the fluid or body with a heat transfer composition comprising the composition of  claim 1 . 
     
     
         27 . A method of replacing an existing refrigerant contained in a refrigerant system comprising replacing at least a portion of said existing refrigerant from said system and replacing at least a portion of said existing refrigerant by introducing into said system a refrigerant composition comprising the composition of  claim 1 .