Process for the manufacture of 1,3,3,3-tetrafluoropropene
US7829748B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2009 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Sep 21, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J21/18
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides an economic process for the manufacture of 1,3,3,3-tetrafluoropropene (HFO-1234ze) by a two stage process. A vapor phase hydrofluorination of 1-chloro-3,3,3-trifluoropropene (HCFC-1233zd) into 1-chloro-1,3,3,3-tetrafluoropropane (HCFC-244fa) and/or 1,1,1,3,3-pentafluoropropane (HFC-245fa) is conducted, followed by the thermal dehydrochlorination of HCFC-244fa and dehydro fluorination of HFC-245fa into HFO-1234ze in the presence of a catalyst which comprises one or more of alkali metal halides, alkaline earth metal halides, halogenated metal oxides, zero oxidation state metals, zinc halides, palladium halides, and activated carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.