Process for the preparation of unsaturated halogenated hydrocabons
US5026460A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Mar 16, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B3/25
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Process for the preparation of unsaturated halogenated hydrocarbons of the formula R.sup.1 --CR.sup.2 .dbd.CR.sup.2 --R.sup.2 in which R.sup.1 and R.sup.2 independently of one another are hydrogen, chlorine or fluorine, R.sup.2 is also --C(R.sup.1).sub.2 --R.sup.3 or the grouping [C(R.sup.1).sub.2 ].sub.m --C(R.sup.1).sub.2 represents two of the radicals R.sup.2, by electrolysis in the presence of certain onium compounds and metal salts, the electrolysis cells being divided or undivided. The process can be carried out continuously or discontinuously under atmospheric pressure or under an elevated pressure up to 10 bar and at temperatures from -40.degree. C. up to the boiling point of the electrolyte; the current density is in the range from 1 to 600 mA/cm.sup.2. The cathode is generally composed of carbon material. The products obtained are suitable for use as starting materials for the preparation of polymers containing fluorine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.