Vinyl chloride prodn. from 1,2-di:chloro-ethane - by contact with aq. alkali contg. phase-transfer catalyst

摘要

Prodn. of vinyl chloride (I) is carried out by introducing 1,2-dichloroethane (II) into an aq. alkali metal hydroxide soln. contg. 0.1-30 wt.% of a phase-transfer catalyst at 15-80 deg.C The alkali metal hydroxide (III) is pref. used as a 1-50% aq. soln. contg. 1-20 wt.% of the catalyst. The (II):(III) molar ratio is pref. 1;1.1-20. The reaction temp. is pref. 25-50 deg.C. The catalyst is suitably a quat. ammonium hydroxide or halide. The catalyst greatly accelerates the formation of (I), which can be obtained in high yields (e.g. more than 90%).