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Method for preparing vinylacetylene

A technology of vinyl acetylene and acetylene, which is applied in the field of preparation of vinyl acetylene, which can solve the problems of large polymers, difficult to further increase the yield of vinyl acetylene, unsatisfactory vinyl acetylene yield, etc., and achieve the suppression of associated high polymer The effect of the generation of compound, the increase of MVA one-way yield, and the increase of MVA selectivity

Inactive Publication Date: 2013-03-13
CHONGQING YOUCUI SCI & TECH
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Problems solved by technology

However, the yield of vinyl acetylene (MVA) in this prior art is not satisfactory, and its specific technical indicators are that the single-pass yield of MVA and the selectivity of MVA are all low—the accompanying The large amount of polymer is one of the reasons for the unsatisfactory yield of vinyl acetylene
Because the associated high polymer is in the form of non-volatile tar, when it accumulates continuously on the reactor wall and pipeline, it will not only reduce the heat transfer efficiency, block the pipeline, but also make the yield of vinyl acetylene lower. easy to improve

Method used

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  • Method for preparing vinylacetylene
  • Method for preparing vinylacetylene
  • Method for preparing vinylacetylene

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Embodiment Construction

[0011] A method for preparing vinyl acetylene, the method is to continuously fill a closed reactor containing a catalyst system with acetylene gas under heating conditions, so that acetylene can undergo a dimerization reaction under the action of the catalyst system to generate ethylene The catalyst system includes main catalyst cuprous chloride, auxiliary solvent ammonium chloride, hydrochloric acid and water. In the present invention, there is also promoter cerium chloride in the catalyst system; the steps of the method are as follows:

[0012] ① Put co-solvent ammonium chloride, co-catalyst cerium chloride and water into the reactor. 3 Nitrogen bubbling and stirring at a flow rate of / h to fully dissolve the ammonium chloride and cerium chloride (under the following proportioning conditions, it can be fully dissolved after 30 minutes);

[0013] ② While maintaining the temperature of 70-90°C, add cuprous chloride and hydrochloric acid to the reactor in turn, and at the same...

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Abstract

The invention relates to a method for preparing vinylacetylene. According to the method, cerium chloride serving as a promoter is added to the catalyzing system on the basis of a nieuwland catalyst system, and the mixing ratio of components and the processing steps of the vinylacetylene are correspondingly adjusted. During the dimerization reaction of acetylene, the generation of associated polymers can be inhibited well, and the amount of generated associated polymers is greatly reduced; and furthermore, the selectivity of the vinylacetylene (MVA) which is the target product can be effectively improved, and the output is raised as well.

Description

technical field [0001] The present invention relates to a process for the preparation of vinyl acetylene by dimerization of acetylene. Background technique [0002] Chloroprene rubber (CR) is an important variety of synthetic rubber. At present, most of the enterprises producing CR use acetylene as the main raw material, and under the action of a catalyst, they first synthesize the intermediates for the production of CR through acetylene dimerization reaction. - Vinyl acetylene. That is to say, if you want to increase the yield of chloroprene rubber, you must first find a better catalyst to increase the yield of vinyl acetylene. This kind of catalyst has already existed, and it is the famous Newland (Nieuwland) catalyst system, which is made of main catalyst cuprous chloride (Cu 2 Cl 2 ), co-solvent ammonium chloride (NH 4 Cl) and hydrochloric acid (HCl) in an acidic aqueous solution. The so-called acetylene dimerization reaction is to continuously fill the closed react...

Claims

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Application Information

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IPC IPC(8): C07C11/30C07C2/38B01J27/122
Inventor 杜军刘作华陶长元
Owner CHONGQING YOUCUI SCI & TECH
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