1,1,-DICHLORO-2,2,3,3,3-PENTAFLUOROPROPANE BASED AZEOTROPIC AND PSEUDO-AZEOTROPIC MIXTURE

摘要

PURPOSE:To obtain a fluorinated hydrocarbon based azeotropic mixture consisting of R255ca, R118 and 2-chloro-2-methylpropane, useful as a cleaning solvent, etc., and usable as a substitute for chlorofluorocarbon (CFC). CONSTITUTION:The mixture obtained by blending (A) 1,1-dichloro-2,2,3,3,3 pentafluoropropane (R225ca), (B) 1,1,2-trichloro-1,2,2trifluoroethane (R113) and (C) 2-chloro-2-methylpropane at the ratio of azeotropic composition of 28-56wt.% component A, 12-64wt.% component B and 2-32wt.% component C, preferably 35-45wt.% component A, 50-60wt.% component B and 2-10wt.% component C, especially 40wt.% component A, 55wt.% component B and 5wt.% component C. The above-mentioned mixture can reduce an amount of conventional fluorocarbons while satisfying excellent characteristics which the above- mentioned fluorocarbons have and simultaneously can be used in the same manner as that of the conventional single fluorocarbon without change of composition during recycle because of the presence of azeotropic point.