Selective catalytical dehydrochlorination of hydrochlorofluorocarbons

• US 8,884,082 B2
• Filed: 02/16/2012
• Issued: 11/11/2014
• 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: Sun, Xuehui, Nappa, Mario Joseph
• Primary Examiner(s): Parsa, Jafar
• Assistant Examiner(s): BAHTA, MEDHANIT W
• Application Number:
  US13/397,967
• Publication Number:
  US 20120215036A1
• Time in Patent Office: 999 Days
• Field of Search: 570/155, 570/156, 570/226, 570/227
• US Class Current: 570/156
• CPC Class Codes: B01J 21/18 Carbon
• CPC Class Codes: B01J 37/06 Washing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B01J 37/084 Decomposition of carbon-containing compounds into carbon
• 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_fCHClCH₂Cl with a carbon catalyst in a reaction zone to produce a product mixture comprising R_fCCl═CH₂, wherein R_f is a perfluorinated alkyl group.

Claims

1. A dehydrochlorination process comprising contacting R_fCHClCH₂Cl with a carbon catalyst in a reaction zone to produce a product mixture comprising R_fCCl═

CH₂, wherein R_f is a perfluorinated alkyl group, wherein the temperature in the reaction zone ranges from about 325°

C. to about 500°

C. and wherein the product selectivity to R_f CCl═

CH₂ is at least 90 mole %.

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

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

4. The dehydrochlorination process of claim 2 wherein the carbon catalyst is a non-acid washed activated carbon.

5. The dehydrochlorination process of claim 1 wherein R_f is CF₃.

6. The dehydrochlorination process of claim 1 wherein the dehydro chlorination selectivity to R_fCCl═

CH₂ is at least 95 mole %.