Catalyst for acetylene dimerization reaction as well as preparation method and application of catalyst

Abstract

The invention relates to a catalyst for acetylene dimerization reaction as well as a preparation method and application of the catalyst. The catalyst is prepared from the following components: an active component, nitrogen-containing hydrochloride, a polymerization inhibitor and an organic solvent. The preparation method comprises the following steps: in a catalyst preparation device, feeding nitrogen, adding the organic solvent into the catalyst preparation device according to a ratio, and continuously feeding the nitrogen to clear away oxygen; dissolving the nitrogen-containing hydrochloride and the polymerization inhibitor into the oxygen-removed organic solvent in sequence, so as to obtain a mixed solution; dissolving cuprous chloride into the mixed solution, stirring at certain temperature, maintaining the temperature for a period of time, continuously feeding the nitrogen at the same time till the cuprous chloride is completely dissolved, and cooling the solution, so as to obtain the catalyst. The catalyst is applied to acetylene dimerization reaction to synthesize vinyl acetylene. According to the catalyst provided by the invention, a simple preparation process is adopted, so that the acetylene conversion rate is increased, and the selectivity of the vinyl acetylene is improved more obviously; the catalyst is beneficial for industrial application.

Description

technical field [0001] The invention belongs to the field of catalyst preparation and industrial application, and in particular relates to a catalyst for acetylene dimerization and its preparation method and application. Background technique [0002] The preparation of vinyl acetylene by acetylene dimerization is an important operation unit for the production of chloroprene rubber by the acetylene method in my country. It uses Newland catalyst, that is, a solution prepared by dissolving cuprous chloride and ammonium chloride in water. Since the invention of this catalyst, it has been used in industry for many years because of its advantages such as simple preparation and low cost, but its shortcoming of more by-products has not been effectively solved. In industrial production, due to the active nature of acetylene and its vinyl acetylene, polymerization reactions can occur, and the resulting high polymers will not only block the pipeline, affect heat transfer, but may also ...

AI Technical Summary

Problems solved by technology

Since the invention of this catalyst, it has been used in industry for many years because of its advantages such as simple preparation and low cost, but its shortcomings of more by-products have not been effectively solved.

In industrial production, due to the active nature of acetylene and its vinyl acetylene, polymerization reactions can occur, and the resulting high polymers will not only block the pipeline, affect heat transfer, but may also cause "liquid seal" and other phenomena, resulting in catalyst loss. activity, product selectivity and yield are usually maintained at a low level

Although some scholars have increased the solubility of acetylene by modifying the catalyst and introducing ionic liquids into the non-aqueous phase system to improve the single-pass conversion rate of acetylene and the selectivity of vinyl acetylene, the production capacity of polymers is still relatively large.

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