composition, heat transfer device, use of a composition, blowing agent, foam, methods for cooling an article, for heating an article, for extracting a substance from biomass, for cleaning an article, for extracting a material from an aqueous solution , to extract material from a solid particulate matrix, to retrofit a heat transfer device, to reduce environmental impact, to prepare a composition and to generate a greenhouse gas emission credit, and, mechanical power generation device

摘要

The invention provides a heat transfer composition comprising (i) from about 45 to about 75% by weight 2,3,3,3-tetrafluoropropene (R-1234yf); and (ii) from about 25 to about 55% by weight 1,1,1,2-tetrafluoroethane (R-134a). A heat transfer composition comprising, optionally consisting essentially of, (i) from about 20 to about 90% by weight R-1234yf; (ii) from about 10 to about 60% by weight R-134a; and (iii) from about 1 to about 20% by weight R-32 is also provided.