Method for preparing vinyl acetylene by electric field enhanced acetylene dimerization

A vinyl acetylene and electric field technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problem that the single-pass conversion of acetylene is not enough and the yield of vinyl acetylene is not high enough.

Inactive Publication Date: 2011-12-07
CHONGQING UNIV
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Problems solved by technology

However, when the existing Newland catalysts are used to facilitate the dimerization of acetylene to produce vinyl acetylene, the single-pass conversion of acetylene and the yield of vinyl acetylene are still not high enough

Method used

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  • Method for preparing vinyl acetylene by electric field enhanced acetylene dimerization

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Embodiment Construction

[0011] The invention discloses a method for preparing vinyl acetylene by electric field enhanced acetylene dimerization. The catalyst used in the method is an aqueous solution prepared by cuprous chloride, ammonium chloride and hydrochloric acid. In the present invention, the component ratio of the catalyst is cuprous chloride: ammonium chloride: hydrochloric acid: water=59.5~63.5kg: 30.5kg: 0.6L: 90L; Carried out under the action, the two poles of setting up the electric field are copper electrodes installed in the reaction device; the steps of the method are as follows:

[0012] ① Under constant temperature conditions of 80°C±5°C, blow nitrogen into the reaction device to remove the air in the reaction device (usually, the time for removing air is not less than 25 minutes); Component proportioning, first add ammonium chloride and water to the reaction device; then while continuing to feed nitrogen to get rid of air, bubbling and stirring to allow ammonium chloride to fully d...

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Abstract

The invention provides a method for preparing vinyl acetylene through electric-field-enhanced dimerization of acetylene. The method is characterized in that: based on the existing Nieuland catalyst, the proportion is adjusted, and the electric field enhancement is supplemented during the entire acetylene dimerization process. Two electrodes of the established electric field are copper electrodes installed in a reaction device, and the current density of the electrodes is 40-60 mA/cm<2>. Verification shows that: under the action of the electric field, the catalysis performance of Nieuland catalyst in the proportion provided in the invention is enhanced to a certain extent, thereby the one-way conversion rate of acetylene and the yield of vinyl acetylene are improved.

Description

technical field [0001] The invention relates to an acetylene dimerization reaction process and a method for preparing vinyl acetylene. Background technique [0002] Chloroprene rubber (CR) is an important variety of synthetic rubber, which is a high polymer of α-chloroprene. Among the current methods for industrialized production of its monomer chloroprene, there is a more widely used acetylene dimerization method, that is, at first the intermediate of chloroprene rubber—vinyl acetylene is synthesized by acetylene dimerization reaction; In the process of synthesizing vinyl acetylene by polymerization method, the catalyst is the key. Among them, the aqueous solution containing cuprous chloride, ammonium chloride and hydrochloric acid (CuCl-NH 4 Cl-HCl-H 2 O) Newland catalyst and its improvement are the most widely used and main ones. The conventional steps of using this catalyst to facilitate the dimerization of acetylene to synthesize vinyl acetylene are: firstly, nitrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/30C07C2/38
Inventor 陶长元彭敏杜军范兴刘作华马纪祥余亚玲刘仁龙牟天明孙大贵周小霞尹利娟左赵宏
Owner CHONGQING UNIV
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