Chlorofluorocarbon isomerization
US5416246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1994 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Oct 14, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is disclosed for producing a saturated gem-dichloro chlorofluorocarbon product of the formula C.sub.n Cl.sub.a F.sub.b, wherein n is 2 to 12, a is 2 to 4, and b is 4 to 24, and wherein a+b equals 2n+2 when the chlorofluorocarbon is acyclic and equals 2n when the chlorofluorocarbon is cyclic, from a starting material of the same formula which has a lesser thermodynamic stability than the saturated gem-dichloro chlorofluorocarbon product. The process involves isomerizing the starting material in the presence of (1) a catalyst of the formula AlZ.sub.3, where Z is selected from F, Cl and/or Br (provided that AlZ.sub.3 cannot be entirely AlF.sub.3) and (2) an effective amount of promoter selected from the group consisting of is selected from hexafluoropropene, 2-chloropentafluoropropene, perfluorobutenes, perfluoropentenes, perfluorocyclobutene, 1-chlorocyclobutene, 1,2-dichlorocyclobutene, perfluorocyclopentene, 1-chlorocyclopentene, and 1,2-dichlorocyclopentene, and mixtures thereof, to accelerate production of the saturated gem-dichloro chlorofluorocarbon product. Also disclosed is a process for producing a halohydrocarbon of the formula C.sub.n H.sub.c Cl.sub.d F.sub.b fro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.