| 摘要 |
The invention provides an improved process to manufacture 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) by reacting 2-chloro-3,3,3,-trifluoropropene (HCFO-1233xf) with hydrogen fluoride, in a liquid phase reaction in the presence of hydrogen chloride and a liquid phase fluorination catalyst. The hydrogen chloride is added into the reaction from an external source at a pressure of about 100 psig or more. The HCFC-244bb is an intermediate in the production of 2,3,3,3-tetrafluoropropene-1 (HFO-1234yf). |
| 主权项 |
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). |
