CATALYTICAL DEHYDROCHLORINATION OF HYDROCHLOROFLUOROCARBONS

• US 20120215037A1
• Filed: 02/10/2012
• Published: 08/23/2012
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: The Chemours Company FC, LLC (The Chemours Company)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Nappa, Mario Joseph, SUN, XUEHUI
• Granted Patent: US 9,012,702 B2
• Time in Patent Office: Days
• US Class Current: 570/157
• CPC Class Codes: C07C 17/25 by splitting-off hydrogen halides from halogenated hydrocarbons
• CPC Class Codes: C07C 21/18 containing fluorine

Abstract

A dehydrochlorination process is disclosed. The process involves contacting R_fCFClCH₂X with a catalyst in a reaction zone to produce a product mixture comprising R_fCF═CHX, wherein said catalyst comprises MY supported on carbon, and wherein R_f is a perfluorinated alkyl group, X═H, F, Cl, Br or I, M=K, Na or Cs, and Y═F, Cl or Br.

Claims

1. A dehydrochlorination process comprising contacting R_fCFClCH₂X with a catalyst in a reaction zone to produce a product mixture comprising R_fCF═

CHX, wherein said catalyst comprises MY supported on carbon, and wherein R_f is a perfluorinated alkyl group, X═

H, F, Cl, Br or I, M=K, Na or Cs, and Y═

F, Cl or Br.

2. The dehydrochlorination process of claim 1 wherein the carbon is an activated carbon.

3. The dehydrochlorination process of claim 2 wherein the carbon is an acid washed activated carbon.

4. The dehydrochlorination process of claim 1 wherein M is K and Y is F or Cl.

5. The dehydrochlorination process of claim 1 wherein the temperature in the reaction zone is from about 200°

C. to about 500°

C.

6. The dehydrochlorination process of claim 5 wherein the temperature in the reaction zone is from about 320°

C. to about 380°

C.

7. The dehydrochlorination process of claim 1 wherein the product selectivity to R_fCF═

CHX is at least 90 mole %.

8. The dehydrochlorination process of claim 1 wherein the product selectivity to R_fCF═

CHX is at least 96 mole %.

9. The dehydrochlorination process of claim 1 wherein R_fCFClCH₂X is CF₃CFClCH₂Cl, and R_fCF═

CHX is CF₃CF═

CHCl.

10. The dehydrochlorination process of claim 1 wherein R_fCFClCH₂X is CF₃CFClCH₃, and R_fCF═

CHX is CF₃CF═

CH₂.

11. The dehydrochlorination process of claim 1, further comprising purging the catalyst with an inert gas.

12. The dehydrochlorination process of claim 11 wherein the inert gas is N₂.