REFRIGERANT MIXTURES COMPRISING TETRAFLUOROPROPENES, DIFLUOROMETHANE, PENTAFLOUROETHANE, AND TETRAFLUOROETHANE AND USES THEREOF

摘要

Compositions are disclosed which contain a refrigerant component consisting essentially of at least one refrigerant having an OEL less than 400; and a combination of refrigerants, each having an OEL greater than 400, consisting essentially of HFC-134a; HFC-32; trans-HFO-1234ze; and optionally at least one refrigerant selected from the group consisting of HFC-134 and HFC-125; provided that HFC-134a is not greater than 26 weight percent of the refrigerant component and the total of HFC-134a and HFC-134 is not less than 20 weight percent of the refrigerant component; and optionally a non-refrigerant component; wherein the refrigerant component has an overall OEL of at least 400 and wherein components the refrigerant component is non-flammable. These compositions are useful in processes to produce refrigeration, in methods for replacing refrigerant R-404A or R-507A, and in refrigeration apparatus.

主权项

1. A composition consisting of:
(A) a refrigerant component consisting essentially of
(1) at least one refrigerant having an OEL less than 400; and(2) a combination of refrigerants, each having an OEL greater than 400, consisting essentially of
(i) HFC-134a;(ii) HFC-32;(iii) trans-HFO-1234ze; and optionally(iv) at least one refrigerant selected from the group consisting of HFC-134 and HFC-125;provided that HFC-134a is not greater than about 26 weight percent of the refrigerant component and the total of HFC-134a and HFC-134 is not less than about 20 weight percent of the refrigerant component; and optionally (B) a non-refrigerant component:
wherein component (A)(2) of the refrigerant component is present in an amount sufficient to provide an overall OEL for the refrigerant component of at least 400 and wherein components (A)(2)(i) and (A)(2)(iv) are present in a total amount sufficient to provide a non-flammable refrigerant component.