AZEOTROPIC MIXTURE AND AZEOTROPE-LIKE MIXTURE OF CHLOROTETRAFLUOROPROPANE

摘要

PURPOSE:To obtain the subject incombustible mixture having characteristics comparable or superior to those of conventional fluorocarbons and suitable as a fluorocarbon substitute or cleaning solvent by using R244ca, R225ca and dichloromethane as essential components. CONSTITUTION:The objective azeotropic mixture is composed of (A) 12wt.% of 1-chloro-2,2,3,3-tetrafluoropropane (R244ca), (B) 34wt.% of 1,1-dichloro-2,2,3,3,3- pentafluoropropane (R225ca) and (C) 54wt.% of dichloromethane and the azeotrope-like composition is composed of 5-41wt.% of A, 9-48wt.% of B and 40-73wt.% of C, preferably 7-17wt.% of A, 29-39wt.% of B and 49-59wt.% of C. The composition has azeotropic point, causes little variation of composition in recycling and can be used in similar manner as conventional simple fluorocarbon. It has higher dissolving power than conventional R113 when used especially as a solvent.