Vapor phase process for preparing fluorinated aliphatic compounds
US5981814A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Mar 23, 2018 |
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 hydrocarbon 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 2 and b is 0 or the integer 1, 2 or 3. The reaction occurs in the vapor phase. A chlorofluoro olefin of the formula EQU CH.sub.c Cl.sub.2-c .dbd.CH--CH.sub.d F.sub.3--d wherein c is 0 or the integer 1 or 2, and d is 0 or the integer 1 or 2 is treated in the vapor phase with hydrogen fluoride. This treating is catalyzed with a compound that is a metal oxide, a metal halide or a mixture thereof. The metallic part of such compound is selected from a metal in Group IIIa, IIIb, IVa, Va, IVb, Vb, VIa, VIb, VIIb and VIII of the Periodic Table of the Elements. The treating is carried out for a time sufficient to form the desired fluorinated aliphatic hydrocarbon which is subsequently recovered from the vapor phase reaction. The process is particularly suitable for the preparation of 1,1,1,3,3-pentafluoropropane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.