Abstract: An azeotropic refrigerant mixture having low GWP and low ODP properties and saving on energy in amounts of from 8% to 17% and consisting of a blend of hydrogen bromide and a fluorohydrocarbon selected from the group consisting of R-123 dichlorotrifluoroethane (CHCl.sub.2 CF.sub.3); R-124 chlorotetrafluoroethane (CHFCICF.sub.3); R-134a tetrafluoroethane (CF.sub.3 CH.sub.2 F); R-142B chlorodifluoroethane (CH.sub.3 CClF.sub.2); R-143a trifluoroethane (CH.sub.3 CF.sub.3); R-152a difluoroethane (CH.sub.3 CHF.sub.2); and R-22 chlorodifluoromethane (CHClF.sub.2), with the HBr component being present in an amount ranging up to less than about 30% by volume, balance fluorohydrocarbon. Preferred blends consist of hydrogen bromide in an amount ranging from between about 8% and 17% by volume.

Abstract: A novel azeotropic mixture of the refrigerants R12, R22 and R142b in which a higher operating temperature and a lower operating pressure are attained than are attainable by any of the refrigerants of the mixture.