Method for prolonging a catalyst's life during hydrofluorination
AssigneeHoneywell International Inc.
InventorsRobert C. Johnson, Daniel C. Merkel
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Abstract
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 the presence of a fluorination catalyst, where by using 2-chloro-3,3,3,-trifluoropropene (HCFO-1233xf) of high purity, the need to add an oxidizing agent (typically chlorine) to keep the catalyst active can be avoided. The HCFC-244bb is then used as an intermediate in the production of 2,3,3,3-tetrafluoropropene-1 (HFO-1234yf).
Claims18
1) A process for producing 2-chloro-1,1,1,2-tetrafluoropropane comprising reacting a feed comprising a substantially pure organic component of 2-chloro-3,3,3,-trifluoropropene with hydrogen fluoride and a fluorination catalyst in the absence of an oxidizing agent.
4) The process of claim 3 wherein the intermediate stream comprises 2-chloro-3,3,3,-trifluoropropene and one or more reaction impurities.
6) The process of claim 3 wherein the step of separating 2-chloro-3,3,3-trifluoropropene from one or more impurities is performed by distillation.
14) A process for the production of 2,3,3,3-tetrafluoropropene comprising:
- (i) reacting a feed comprising a substantially pure organic component of 2-chloro-3,3,3,-trifluoropropene with hydrogen fluoride and a fluorination catalyst in the absence of an oxidizing agent to produce 2-chloro-1,1,1,2-tetrafluoropropane;
- and
- (ii) dehydrohalogenating the 2-chloro-1,1,1,2-tetrafluoropropane under conditions effective to produce 2,3,3,3-tetrafluoropropene.
19) A process for producing 2,3,3,3-tetrafluoropropene comprising
- (i) fluorinating 1,1,2,3,-tetrachloropropene and/or 1,1,1,2,3-tetrachloropropane to produce an intermediate stream comprising 2-chloro-3,3,3-trifluoropropene and one or more impurities;
- (ii) separating 2-chloro-3,3,3-trifluoropropene from an intermediate stream to form substantially pure 2-chloro-3,3,3-trifluoropropene;
- (iii) reacting a feed comprising a substantially pure organic component of 2-chloro-3,3,3,-trifluoropropene with hydrogen fluoride and a fluorination catalyst in the absence of an oxidizing agent to produce 2-chloro-1,1,1,2-tetrafluoropropane;
- and
- (iv) dehydrohalogenating the 2-chloro-1,1,1,2-tetrafluoropropane under conditions effective to produce 2,3,3,3-tetrafluoropropene.
Dependencies are inferred from the claim text.