Process for preparing fluorinated aliphatic compounds
US5684219A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Nov 5, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/21
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for the preparation of a fluorinated aliphatic olefin having the formula EQU CH.sub.a F.sub.3-a --CH.sub.2 --CH.sub.b F.sub.3-b wherein a is 0 or the integer 1 or d and b is 0 or the integer 1, 2 or 3. In the first step of the process, a chlorinated olefinic hydrocarbon of the formula EQU CH.sub.c Cl.sub.2-c .dbd.CH--CH.sub.d Cl.sub.3-d wherein c is 0 or the integer 1 and d is 0 or the integer 1 or 2 is reacted with anhydrous hydrogen fluoride for a period of time and at a temperature sufficient to form a chlorofluoro olefin of the formula EQU CH.sub.e Cl.sub.2-e .dbd.CH--CH.sub.f F.sub.3-f wherein e is 0 or the integer 1 and f is 0 or the integer 1 or 2. The chlorofluoro olefin produced in the first step is then reacted with anhydrous hydrogen fluoride in a second reaction. This second reaction is catalyzed with at least one compound that is a metal oxide or metal halide. Mixtures of said metal oxides, metal halides and metal oxides with metal halides may also be used. The metallic part of such compound is arsenic, antimony, tin, boron or is selected from a metal in Group IVb, Vb. VIb. VIIb or VIIIb of the Periodic Table of the Elements. The desired fluorina…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.