Patent ID: 6221273
Filing Date: 2001-04-24
Classification: C09K,C10M

Abstract:
A method for heating or cooling an object using a heat pump or air conditioner or similar refrigeration machine, said method comprising using a near azeotropic or azeotropic composition based on hexafluoropropane (R 236) as a drop-in substitute for 1,2-dichlorotetrafluoroethane (R 114), wherein said composition consists essentially of:1) 1,1,1,3,3,3-hexafluoropropane (R 236fa) 90-98% by wt.n-butane (R 600) 2-10% by wt.,2) 1,1,1,3,3,3-hexafluoropropane (R 236fa) 35-85% by wt.n-butane (R 600) present in an amount of lower than 5% by wt.bis(difluoromethyl) ether (RE 134) 5-63% by wt., or3) 1,1,1,3,3,3-hexafluoropropane (R 236fa) 40-88% by wt.n-butane (R 600) present in an amount of lower than 5% by wt.1,1,1,2,3,3-hexafluoropropane (R 236ea) 2-58% by wt.