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Catalytic system, preparation method thereof, and preparation method of vinyl acetylene by the same

A vinyl acetylene and catalytic system technology, applied in the chemical industry, can solve the problems of reducing the selectivity of vinyl acetylene, reducing the service life of the catalyst, and low selectivity of vinyl acetylene, and achieves reduced effective conversion rate, low production cost, and selectivity sex high effect

Active Publication Date: 2014-12-17
SHIHEZI UNIVERSITY
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Problems solved by technology

At present, the catalyst used in the industrial production of vinyl acetylene in my country has been using the Newland catalytic system, but from the perspective of saving energy and increasing productivity, the catalytic system has the following shortcomings: (1) The selectivity of vinyl acetylene is low , in the acetylene dimerization process, due to the poor catalytic selectivity of the catalyst, in addition to the main product vinyl acetylene, the output of by-products such as acetaldehyde, vinyl chloride and divinyl acetylene is also relatively large in the reaction product, of which Production of divinylacetene in particular is high, resulting in low vinylacetylene selectivity, i.e. low effective conversion of acetylene
(2) The acetylene dimerization process is also accompanied by the generation of tar-like polymers. The accumulation of a large number of polymers not only reduces the selectivity of vinyl acetylene, but also reduces the service life of the catalyst.

Method used

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  • Catalytic system, preparation method thereof, and preparation method of vinyl acetylene by the same
  • Catalytic system, preparation method thereof, and preparation method of vinyl acetylene by the same
  • Catalytic system, preparation method thereof, and preparation method of vinyl acetylene by the same

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preparation example Construction

[0028] A method for the preparation of a catalytic system for catalyzing the dimerization of acetylene to prepare vinyl acetylene, such as figure 1 Shown, the preparation method of this catalytic system mainly comprises the following steps:

[0029] 1. Add co-solvent and water into the reactor with nitrogen gas, stir at the first set temperature to dissolve all the co-solvent, and obtain an aqueous solution of co-solvent;

[0030] Wherein, before adding water and co-solvent to the reactor in this step, just with 110-155 -1 Nitrogen was passed into the reactor at a space velocity of at least one hour to get rid of the air in the reactor, and then in the preparation process of the subsequent catalytic system, the nitrogen was consistent at 110-155 -1 The space velocity is continuously passed into the reactor. Preferably, the reactor in this step is a bubbling reactor. The first set temperature is 30-90°C, preferably 60-90°C. In addition, the co-solvent in this step is a chlo...

Embodiment 1

[0046] (1) Take 110h -1 -155h-1 Nitrogen gas is passed into the bubble reactor at the space velocity. After 1-2 hours, 21-30g of water and 8.0g of ammonium chloride are added to the bubble reactor. Stir with air blowing to dissolve all the ammonium chloride.

[0047] (2) At a temperature of 60-90° C., add 14.81 g of main catalyst cuprous chloride and 3.0 g of ligand polyethylene glycol with an average molecular weight of 600 successively in the above-mentioned reactor filled with ammonium chloride aqueous solution. 110-155 -1 Under space velocity nitrogen bubbling and stirring, the cuprous chloride was fully dissolved, and 0.1 mL of hydrochloric acid was added to adjust its pH value to obtain a catalytic system.

[0048] (3) Passing acetylene gas instead of nitrogen into the catalytic system in the above step, and bubbling and stirring at a temperature of 60-90° C., so as to cause dimerization of acetylene to obtain vinyl acetylene.

Embodiment 2

[0050] (1) Take 110h -1 -155h -1 Nitrogen gas is passed into the bubble reactor at the space velocity. After 1-2 hours, 21-30g of water and 8.0g of ammonium chloride are added to the bubble reactor. Stir with air blowing to dissolve all the ammonium chloride.

[0051] (2) At a temperature of 60-90° C., add 14.81 g of main catalyst cuprous chloride and 3.0 g of ligand polyethylene glycol with an average molecular weight of 400 in the above-mentioned reactor filled with ammonium chloride aqueous solution. 110-155 -1 Under space velocity nitrogen bubbling and stirring, the cuprous chloride was fully dissolved, and 0.1 mL of hydrochloric acid was added to adjust its pH value to obtain a catalytic system.

[0052] (3) Passing acetylene gas instead of nitrogen into the catalytic system in the above step, and bubbling and stirring at a temperature of 60-90° C., so as to cause dimerization of acetylene to obtain vinyl acetylene.

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Abstract

The invention discloses a catalytic system, a preparation method thereof, and a preparation method of vinyl acetylene by the same, relates to the field of chemical industry, and solves the problems of large quantity of generated by-products and polymers and low selectivity of vinyl acetylene in vinyl acetylene production by using acetylene dimerization method in the prior art. A main technical scheme of the invention is as below: the catalytic system is used for catalyzing acetylene dimerization to produce vinyl acetylene. The preparation method of the catalytic system mainly comprises the following steps: adding a cosolvent and water into a reactor with nitrogen, and stirring under a first set temperature to thoroughly dissolve the cosolvent to obtain a cosolvent aqueous solution; and under a second set temperature, adding a main catalyst of cuprous chloride and a ligand polyethylene glycol solvent in the cosolvent aqueous solution to cuprous chloride, thoroughly dissolving cuprous chloride, and adding an acid solution to obtain the catalytic system. The invention is mainly used to improve the selectivity of vinyl acetylene and effective conversion rate of acetylene in the production process of acetylene dimerization method for preparation of vinyl acetylene.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a catalytic system, a preparation method thereof and a preparation method of vinyl acetylene. Background technique [0002] Vinyl acetylene is an important fine chemical intermediate, which is widely used in the production of various important chemical products such as chloroprene rubber, 4-chlorophthalic anhydride and vinyl polymers. At present, acetylene is mainly used as the main raw material, and vinyl acetylene is synthesized through acetylene dimerization under the action of a catalyst. At present, the catalyst used in the industrial production of vinyl acetylene in my country has been using the Newland catalytic system, but from the perspective of saving energy and increasing productivity, the catalytic system has the following shortcomings: (1) The selectivity of vinyl acetylene is low , in the acetylene dimerization process, due to the poor catalytic selectivity of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C07C2/38C07C11/30
Inventor 代斌卢俊龙谢建伟刘平王绪根刘志勇刘海月
Owner SHIHEZI UNIVERSITY
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