Process for producing 1,1,1,3,3-pentafluoropropane
US6472573B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2000 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Aug 2, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of preparation for 1,1,1,3,3-pentafluoropropane (HFC-245fa) wherein the first process gives mainly 1,3,3,3-tetrafluoropropene (1234ze) by reacting 1-chloro-3, 3,3,-trifluoropropene (1233zd) with hydrogen fluoride in the gas phase and subsequently the second process gives 1,1,1,3,3-pentafluoropropane (HFC-245fa) by reacting 1,3,3,3-tetrafluoropropene (1234ze), separated as a component that does not contain hydrogen chloride from crude products obtained by the first process, with hydrogen fluoride in the gas phase. To provide a process that is capable of preparing economically HFC-245fa which does not require the separation of HFC-245fa and 1233zd.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.