Process for the hydrohalogenation of an alkyne and for the manufacture of vinyl chloride by hydrochlorination of acetylene

Abstract

The invention relates to a process for the hydrohalogenation of an alkyne and for the manufacture of vinyl chloride by hydrochlorination of acetylene. Process for the hydrohalogenation of an alkyne and for manufacturing vinyl chloride by hydrochlorination of acetylene in the presence of a catalytic system comprising at least one ionic liquid comprising at least one non-protonated cation, according to which said process is carried out in apparatus made from or covered with materials which are resistant to halogenated acids and more particularly HC1, in dissociated form.

Description

[0001] This application is a Chinese invention with an application date of February 21, 2012, an application number of 201280010264.4, and an invention title of "Method for Hydrohalogenated Alkynes and Production of Alkenes by Hydrochlorination of Alkynes" A divisional application of a patent application. technical field [0002] The invention relates to a process for the hydrohalogenation of alkynes and for the production of chlorinated alkenes by hydrochlorination of alkynes. In particular, the present invention relates to a process for the hydrohalogenation of alkynes and the production of vinyl chloride by hydrochlorination of acetylene in the presence of a catalytic system comprising at least one ionic liquid comprising at least one A non-protonated cation according to the method carried out in equipment made or covered by a material resistant to halogenated acids and more particularly HCl in dissociated form. Background technique [0003] The production of vinyl chlor...

AI Technical Summary

Problems solved by technology

Although it allows high yields to be obtained, however, this method has some significant disadvantages: it has been shown that this liquid catalyst system gradually degrades under the reaction conditions, leading to the formation of black products with a carbonaceous appearance

However, the catalyst systems described therein, especially those in which the Group VIII metal compound is platinum(II) chloride or palladium(II) chloride, when considered in the production of vinyl chloride by the hydrochlorination of acetylene While the performance they enable to achieve is not entirely satisfactory in terms of productivity and long-term stability

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