Patent ID: 8946493
Filing Date: 2015-02-03
Classification: C07C,Y02P

Abstract:
1. Process for the manufacture of 1,1,1,2,3-pentafluoropropane, comprising (i) reacting 1,2,3,3,3-pentafluoropropene in the gas phase with hydrogen in a superstoichiometric amount, at a temperature of between 80 and 250° C. in the presence of a hydrogenation catalyst in a reactor to produce a gaseous output stream, wherein the gaseous output stream comprises from 5 to 96% by volume of 1,1,1,2,3-pentafluoropropane, from 2 to 90% by volume of hydrogen, from 1 to 20% of 1,1,1,2-tetrafluoropropane and from 0 to 10% of 1,2,3,3,3-pentafluoropropene; (ii) recycling a first portion of the gaseous output stream from the reactor, comprising 1,1,1,2,3-pentafluoropropane, unreacted hydrogen, optionally unreacted 1,2,3,3,3-pentafluoropropene, 1,1,1,2-tetrafluoropropane and hydrofluoric acid, and (iii) recovering 1,1,1,2,3-pentafluoropropane from a second portion of the gaseous output stream from the reactor, optionally after a purification stage, wherein the recycled first portion of the gaseous output stream represents at least 80%, by volume of the output stream.