Fluorine removal from antimony fluorohalide catalyst using chlorocarbons
AssigneeThe Chemours Company Fc, LLC
InventorsXuehui Sun, Mario Joseph Nappa, Karl Krause
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Abstract
A method of chlorinating a antimony fluorohalide catalyst is disclosed. In one embodiment the method comprises contacting an antimony fluorohalide catalyst that contains one or more fluorines with a regenerating agent chosen from 2-chloro-3,3,3-trifluoropropene (1233xf), 1,1,1,3-tetrachloropropane (250fb), 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb) and combinations of 1233xf, 250fb, and 244bb, under conditions effective to exchange at least one fluorine in the antimony fluorohalide catalyst with chlorine. The method can be used to regenerate spent antimony fluorohalide catalyst, for example regenerating SbCl5 from SbF5.
Claims18
A method of chlorinating an antimony fluorohalide catalyst comprising:
- contacting an antimony fluorohalide catalyst that contains one or more fluorines with a regenerating agent chosen from 2-chloro-3,3,3-trifluoropropene (1233xf), 1,1,1,3-tetrachloropropane (250th), 2-chloro-1,1,1,2-tetrafluoropropane (244bb), and combinations of two or more of 1233xf, 250fb, and 244bb under conditions effective to exchange at least one fluorine in the antimony fluorohalide catalyst with chlorine.
A method of regenerating and recovering a spent antimony fluorohalide catalyst to produce a chlorinated antimony catalyst comprising:
- (a) treating a spent antimony fluorohalide catalyst comprising
- (i) SbFnX5-n, wherein n is an integer of 1 to 5, and X is a halogen other than fluorine, or
- (ii) SbFmX′3-m, wherein m is an integer of 1 to 3, and X′ is a halogen other than fluorine, or mixtures of (i) and (ii),
- with a regenerating agent chosen from 2-chloro-3,3,3-trifluoropropene (1233xf), 1,1,1,3-tetrachloropropane (250th), 2-chloro-1,1,1,2-tetrafluoropropane (244bb), and combinations of two or more of 1233xf, 250fb, and 244bb, under conditions effective to produce a chlorinated antimony catalyst;
- and
- (b) recovering the chlorinated antimony catalyst.
A composition comprising:
- at least one antimony fluorohalide catalyst selected from the group consisting of
- (i) SbFnX5-n, wherein n is an integer of 1 to 5, and X is a halogen other than fluorine, and
- (ii) SbFmX′3-m, wherein m is an integer of 1 to 3, and X′ is a halogen other than fluorine, or mixtures of (i) and (ii);
- and
- at least one compound selected from the group consisting of 2-chloro-3,3,3-trifluoropropene (1233xf), 1,1,1,3-tetrachloropropane (250fb), 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), and combinations of two or more of 1233xf, 250fb, and 244bb.
Dependencies are inferred from the claim text.