초록

A refrigerant composition comprising a hydrofluorocarbon component including 1,1,1,2-tetrafluoroethane (HCFC 134a), the composition further comprising an additive selected from a saturated hydrocarbon or mixture thereof boiling in the range -5 to +70° C.

대표청구항 ▼

1. A refrigerant composition comprising 1,1,1,2-tetrafluoroethane (R 134a), pentafluoroethane (R 125) and an additive selected from a saturated hydrocarbon or mixture thereof boiling in the range -5 to +70° C., wherein the weights of R 125 to R 134a are in the ranges: TBL R 125

1. A refrigerant composition comprising 1,1,1,2-tetrafluoroethane (R 134a), pentafluoroethane (R 125) and an additive selected from a saturated hydrocarbon or mixture thereof boiling in the range -5 to +70° C., wherein the weights of R 125 to R 134a are in the ranges: TBL R 125 50-80% R 134a 50-20%. 2. A refrigerant composition as claimed in claim 1, wherein the weights are in the ranges: TBL R 125 60-80% R 134a 40-20%. 3. A refrigerant composition as claimed in claim 2, wherein the weights are in the ranges: TBL R 125 60-78% R 134a 40-22%. 4. A refrigerant composition as claimed in claim 3, wherein the weights are in the ranges: TBL R 125 64-76% R 134a 36-24%. 5. A refrigerant composition as claimed in claim 1, wherein the weights are in the ranges: TBL R 125 57-78% R 134a 43-22%. 6. A refrigerant composition as claimed in claim 5, wherein the weights are in the ranges: TBL R 125 63-76% R 134a 37-24%. 7. A refrigerant composition as claimed in claim 1, wherein the hydrocarbon additive is selected from the group consisting of 2-methylpropane, 2,2-dimethylpropane, butane, pentane, 2-methylbutane, cyclopentane, hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, methylcyclopentane and mixtures thereof. 8. A refrigerant composition as claimed in claim 1, wherein the hydrocarbon additive has a boiling point in the range of 20 to 40° C. 9. A refrigerant composition as claimed in claim 8, wherein the hydrocarbon additive is selected from the group consisting of n-pentane, cyclopentane, iso-pentane and mixtures thereof. 10. A refrigerant composition as claimed in claim 9, wherein the hydrocarbon additive is n-pentane. 11. A refrigerant composition as claimed in claim 9, wherein the additive further comprises butane. 12. A refrigerant compositions as claimed in claim 11, wherein the ratio of pentane:butane is 1:3 to 1:8. 13. A refrigerant composition as claimed in claim 1, wherein the amount of hydrocarbon additive is up to 10%. 14. A refrigerant composition as claimed in claim 13, wherein the amount of hydrocarbon additive is 1 to 8%. 15. A refrigerant composition as claimed in claim 14, wherein the amount of hydrocarbon additive is 2 to 4%. 16. A refrigerant composition as claimed in claim 1, further comprising up to 30% chlorodifluoromethane (R 22). 17. A refrigerant extender mixture comprising a refrigerant composition as claimed in claim 1. 18. A method of modifying a refrigerator or air conditioning system which incorporates R 22 as refrigerant, the method comprising the step of adding a refrigerant extender as claimed in claim 17 to the refrigerant of the system. 19. A method of extending R 22 refrigerant in a refrigeration or air conditioning device, comprising: adding to an R 22 refrigerant in a refrigeration or air conditioning device a refrigerant composition having a hydrofluorocarbon component comprising difluoromethane (R 32), R 125 and R 134a, wherein the ratio of weights of R 32, R 125 and R 134a are in the ranges: TBL R 32 18-28% R 125 20-30% R 134a 42-62%. 20. A refrigerant composition as claimed in claim 12, wherein the ratio of pentane:butane is 1:5.