1234ze preparation

• US 6,124,510 A
• Filed: 07/21/1998
• Issued: 09/26/2000
• Est. Priority Date: 07/21/1998
• Status: Expired due to Fees

• Current Assignee: ATOFINA Chemicals, Inc. (Arkema)
• Original Assignee: Elf Atochem North America, Inc. (Totalenergies Se)
• Inventors: Fellenger, Paul D., Elsheikh, Maher Y.
• Primary Examiner(s): SIEGEL, ALAN M
• Application Number:
  US09/119,560
• Time in Patent Office: 798 Days
• Field of Search: 570/157, 570/158
• US Class Current: 570/156
• CPC Class Codes: C07C 17/25 by splitting-off hydrogen halides from halogenated hydrocarbons
• CPC Class Codes: C07C 21/18 containing fluorine

Abstract

Preparation of cis/trans 1234ze monomer is provided, by dehydrofluorination of 245fa using an alkaline solution or using a gas phase catalyzed process.

Claims

1. A process for the preparation of cis/trans 1,1,1,3-tetrafluoro-2 -propene which comprises (a) contacting 1,1,1,3,3-pentafluoropropane with an oxygen-containing gas in the presence of a fluorided catalyst selected from Cr₂ O₃ or Cr/Ni/AlF₃, and (b) recovering cis/trans 1,1,1,3-tetrafluoro-2-propene from the resulting reaction mixture.

2. A process as in claim 1 wherein the catalyst is fluorided Cr₂ O₃.

3. A process as in claim 1 wherein the catalyst is fluorided Cr/Ni/AlF₃.