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US 12,509,410 B2Granted
Compositions and methods for an integrated 2,3,3,3-tetrafluoropropene manufacturing process
AssigneeThe Chemours Company Fc, LLC
InventorAndrew Jackson
Life of this patent
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Abstract
A method of synthesizing 3,3,3-trifluoropropene including contacting 1,1,1,3-tetrachloropropane, in the vapor phase, at a temperature sufficient to effect dehydrochlorination to form 1,1,3-trichloro-1-propene. The 1,1,3-trichloro-1-propene is isolated and subsequently contacted, in the vapor phase, with hydrogen fluoride in the presence of a fluorination catalyst at a temperature sufficient to effect formation of 3,3,3-trifluoropropene.
Claims12
An integrated process of converting 1,1,1,3-tetrachloropropane to 2,3,3,3-tetrafluoropropene, comprising;
- (a) dehydrochlorinating 1,1,1,3-tetrachloropropane (HCC-250fb) in the liquid phase, under an inert atmosphere and temperatures between 80° C. and 110° C., in the presence of a catalyst and a strong base to form a product mixture containing 1,1,3-trichloro-1-propene (HCO-1240za),
- (b) recovering the product mixture of (a),
- (c) treating the product mixture of (b) to form an intermediate feed of 1,1,3-trichloro-1-propene (HCO-1240za) having a purity between 90 mole % to about 99.9 mole %,
- (d) continuously feeding and fluorinating the intermediate feed (c) of 1,1,3-trichloro-1-propene (HCO-1240za) at a temperature between 270° C. and 325° C., in the presence of at least one of activated carbon, alumina, and chromium oxide fluorided with discrete N2:HF mixtures, to form 3,3,3-trifluoropropene (HFO-1243zf) and maintain a selectivity to HFO-1243zf of at least 95% over a period of at least 40 hours, and
- (e) converting the 3,3,3-trifluoropropene (HFO-1243zf) to 2,3,3,3-tetrafluoropropene (HFO-1234yf) in the presence of a second fluorination catalyst.
2 more elements
Dependencies are inferred from the claim text.