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Vinyl acetylene product and preparation method thereof

A technology for vinyl acetylene and acetylene, applied in the field of vinyl acetylene products and their preparation, can solve the problems of affecting the preparation efficiency of vinyl acetylene, shortening the life of the catalyst, needing to be improved, etc., and achieves efficient preparation, long life of the catalyst, and less time required Effect

Inactive Publication Date: 2013-09-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet the above-mentioned method that adopts non-aqueous phase catalyst to carry out acetylene dimerization reaction to prepare vinyl acetylene, although can obtain higher acetylene conversion rate, but the active component of catalyst in its reaction system forms solid precipitation easily and loses, thereby reduces The life of the catalyst seriously affects the production efficiency of vinyl acetylene
[0004] Therefore, the current preparation method of vinyl acetylene still needs to be improved

Method used

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  • Vinyl acetylene product and preparation method thereof
  • Vinyl acetylene product and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 55ml of dimethylformamide organic solvent into a two-necked flask, heat to 60°C, add co-solvent ethylamine hydrochloride to it, after the co-solvent is completely dissolved, then add active component CuCl, and at the same time pass nitrogen to protect To prevent the cuprous chloride from being oxidized, stir for 30 minutes until CuCl is completely dissolved, and the desired catalyst solution is obtained. Pour the catalyst into a glass bubbling bed reactor with an aspect ratio of 5, and pass nitrogen gas for 20 minutes to completely discharge the air in the reactor, then switch the gas to acetylene, and feed acetylene and HCl gas into the reactor , in order to carry out acetylene dimerization reaction to prepare vinyl acetylene. Among them, during the reaction process, the reaction temperature is maintained at 65°C, and the space velocity of acetylene is 200h -1 , the space velocity of HCl gas 3h -1 . In addition, before passing acetylene into the reactor, acety...

Embodiment 2

[0022] According to the method of Example 1, vinyl acetylene was prepared. Wherein, the difference from Example 1 is: no HCl gas is introduced during the reaction.

Embodiment 3

[0024] According to the method of Example 1, vinyl acetylene was prepared. Wherein, the difference from Example 1 is that the reaction temperature is 70°C.

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Abstract

The invention provides a vinyl acetylene product and a preparation method thereof. According to the preparation method, a nonaqueous phase catalyst is used to ensure that acetylene is subjected to dimerization reaction, and in the reaction process, an acid gas is introduced into a reaction system. By adopting the method for preparing vinyl acetylene, the service life of the nonaqueous phase catalyst can be prolonged, so that the vinyl acetylene can be efficiently prepared.

Description

technical field [0001] The invention relates to the technical field of vinyl acetylene preparation. In particular, the present invention relates to vinyl acetylene articles and methods for their preparation. Background technique [0002] Vinyl acetylene is the main raw material for the production of neoprene monomer chloroprene, and can also be used in the production of important chemical products such as 4-chlorophthalic anhydride, diacetylbenzene, benzene, and styrene. Therefore, it is of great significance to efficiently produce vinyl acetylene. [0003] In the current price segment, vinyl acetylene is mainly produced through acetylene dimerization in industry, and Nieuwland catalyst is mainly used, which uses CuCl as the active component and NH 4 Cl or KCl is a cosolvent, which is prepared by dissolving it in deionized water together with a small amount of hydrochloric acid (see: W.H.Carothers, I.Williams, A.M.Collins, J.E.Kirby.J.Am.Chem.Soc, 1931,53: 4203, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/30C07C2/38
Inventor 韩明汉刘建国左宜赞汪展文
Owner TSINGHUA UNIV
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