Patent ID: 9061958
Filing Date: 2015-06-23
Classification: B01D,C07C

Abstract:
1. A method for producing monochloro-trifluoropropene from an azeotrope or azeotrope like combination of monochloro-trifluoropropene and HF which comprises (a) distilling a reaction mixture comprising hydrogen fluoride, monochloro-trifluoropropene, and hydrogen chloride to remove hydrogen chloride as overhead and a bottoms stream, (b) cooling the bottoms stream to form two liquid phases, (c) separating said two liquid phases in a liquid phase separator into a first light phase comprising hydrogen fluoride in excess over an azeotrope or azeotrope like combination of monochloro-trifluoropropene and hydrogen fluoride and a second heavy phase comprising an excess of monochloro-trifluoropropene over an azeotrope or azeotrope like combination of monochloro-trifluoropropene, (d) distilling said first light phase in a distillation column to produce a top stream of an azeotrope of monochloro-trifluoropropene and hydrogen fluoride and a bottoms stream of hydrogen fluoride, (e) contacting said second heavy phase with an absorbent to remove HF followed by distilling said second heavy phase in a distillation train to provide a monochloro-trifluoropropene stream.