Patent ID: 9181151
Filing Date: 2015-11-10
Classification: C07C

Abstract:
1. A process for the production of 2,3,3,3-tetrafluoropropene which comprises: (i) continuously reacting 2-chloro-3,3,3,-trifluoropropene with hydrogen fluoride, in a liquid phase reaction and co-feeding hydrogen chloride, in the presence of a liquid phase fluorination catalyst to produce a composition comprising 2-chloro-1,1,1,2-tetrafluoropropane, wherein the hydrogen chloride is added into the reaction from an external source at a pressure of about 100 psig or more; (ii) dehydrohalogenating the 2-chloro-1,1,1,2-tetrafluoropropane under conditions effective to produce 2,3,3,3-tetrafluoropropene; wherein (iii) said 2-chloro-3,3,3,-trifluoropropene is produced by a process comprising fluorinating 1,1,2,3-tetrachloropropene with hydrogen fluoride to produce an intermediate product comprising hydrogen fluoride, 2-chloro-3,3,3,-trifluoropropene and hydrogen chloride; (iv) removing from said intermediate product at least a portion of said hydrogen chloride; and (v) introducing at least a portion of the hydrogen chloride removed in said step (iv) into said liquid phase reaction of step (i).