Process for the preparation of unsaturated halogenated hydrocabo

Details Process for the preparation of unsaturated halogenated hydrocabo Process for the preparation of unsaturated halogenated hydrocabo

1989-03-16

1991-06-25

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 72, 204 78, C25B 300

Patent

active

050264605

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.

REFERENCES:
patent: 4162948 (1979-07-01), Yagii et al.
patent: 4707226 (1987-11-01), Dapperheld
patent: 4800012 (1989-01-01), Dapperheld

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