AZEOTROPIC MIXTURE AND AZEOTROPE-LIKE MIXTURE OF DICHLOROPENTAFLUOROPROPANE

摘要

PURPOSE:To provide the subject mixture composed of R225ca, R225cb and cis-1,2-dichloroethylene, having excellent characteristics comparable or superior to those of conventional fluorocarbons and usable as a fluorocarbon substitute. CONSTITUTION:The objective mixture can be produced by compounding (A) 1,1-dichloro-2,2,3,3,3-pentafluoropropane (R225ca), (B) 1,3-dichloro-1,1,2,2,3- pentafluoropropane (R225cb) and (C) cis-1,2-dichloroethylene at weight ratios (A:B:C) (wt.%) of (6--70):(4-74):(20-38), preferably (53-64):(6-17):(24-35), especially 58 : 12 : 30 (azeotropic composition). Since the mixture has azeotropic point, it causes little variation of the composition in recycling and is usable similar to conventional simple fluorocarbon. It exhibits higher dissolving power than R113 when used as a solvent.