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A kind of acetylene dimerization solid phase catalyst and its preparation method, application

An acetylene dimerization solid-phase and catalyst technology, which is applied to catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of large addition amount, reduced catalyst activity, and unrecoverable catalysts, and achieves convenient recovery and utilization. small amount of effect

Active Publication Date: 2021-07-30
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the research on the gas-liquid reaction system of acetylene dimerization in recent years, it has been found that the low conversion rate of acetylene and the low selectivity of MVA have become the main problems preventing the development of this reaction. The single-pass conversion rate of acetylene in industry is less than 10%. MVA selectivity less than 85%
In addition, during the reaction process, the active component copper is wrapped by the generated polymer, which reduces the activity of the catalyst. At the same time, it is difficult to separate the catalyst after the reaction, and the catalyst cannot be recycled, which will pollute the environment.
In addition, in the traditional liquid phase reaction, the amount of cuprous chloride and cupric chloride added is relatively large, and the amount of catalyst complex added is large and expensive. After the liquid phase catalyst is used, there are high polymers attached to the reactor, which makes the equipment difficult to clean

Method used

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  • A kind of acetylene dimerization solid phase catalyst and its preparation method, application
  • A kind of acetylene dimerization solid phase catalyst and its preparation method, application
  • A kind of acetylene dimerization solid phase catalyst and its preparation method, application

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preparation example Construction

[0052] The preparation steps of monometallic catalyst among the present invention are as follows:

[0053] (1) In a nitrogen atmosphere, at 70-90°C, completely dissolve 2-5g of aliphatic amine hydrochloride in 10-20mL of solvent, then add 0.01-0.08mol of cuprous chloride to completely dissolve it.

[0054] The solvent is a mixed solvent of N,N-dimethylformamide (DMF) and 1,4-dioxane.

[0055](2) Add 1-5g coconut shell activated carbon, stir at 70-90°C for 100-140min, and then stir at room temperature for 9-11h.

[0056] In the present invention, after the catalyst carrier is added, the catalyst is first stirred at a certain temperature, and then stirred at room temperature, so that the prepared catalyst has better catalytic effect.

[0057] (3) Suction filtration, and finally suction filtration, vacuum drying at 70-90° C. for 22-26 hours to obtain the solid phase catalyst for acetylene dimerization, which is a monometallic catalyst for gas-solid reaction of acetylene dimeriza...

Embodiment 1

[0066] Monometallic catalysts:

[0067] (1) In a nitrogen atmosphere, at 80° C., 4 g of aliphatic amine hydrochloride (R is ethyl) was completely dissolved in 15 mL of solvent, and then 0.04 mol of cuprous chloride was added to completely dissolve it.

[0068] The solvent is a mixed solvent of N,N-dimethylformamide (DMF) and 1,4-dioxane.

[0069] (2) Add 3g of coconut shell activated carbon, stir at 80°C for 120min, and then stir at room temperature for 10h.

[0070] (3) Suction filtration, and finally suction filtration, vacuum drying at 80° C. for 24 hours to obtain the solid phase catalyst for acetylene dimerization, which is a monometallic catalyst for gas-solid reaction of acetylene dimerization.

[0071] Bimetallic catalysts:

[0072] (1) In a nitrogen atmosphere, at 80°C, after completely dissolving 4g of aliphatic amine hydrochloride (R is ethyl) in 15mL of solvent, add 0.04mol cuprous chloride, and after it is completely dissolved, add 0.01mol Copper chloride, stir...

Embodiment 2

[0079] The preparation in this example is a bimetallic catalyst. The solvent in this example is DMF, and other reaction conditions are the same as Example 1. The conversion rate of acetylene, the selectivity of vinyl acetylene and the yield of acetylene are shown in Table 1.

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Abstract

The present invention relates to an acetylene dimerization solid-phase catalyst and its preparation method and application. An acetylene dimerization solid-phase catalyst is prepared from the following raw materials: an active component, a cosolvent, a solvent and a catalyst carrier; the active component is cuprous chloride; the cosolvent is aliphatic amine hydrochloric acid Salt, which has the formula RNH 2 ·HCl, R is C1-C with straight or branched chain 4 alkyl; described solvent is made up of N,N-dimethylformamide and 1,4-dioxane; described catalyst carrier coconut shell activated carbon. The invention also discloses the preparation method and application of the catalyst. The acetylene dimerization solid-phase catalyst, preparation method and application thereof of the present invention are solid-phase catalysts, the catalyst dosage is small, the catalyst recycling is convenient, the catalyst activity is high, and the stability is good.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to an acetylene dimerization solid-phase catalyst and its preparation method and application. Background technique [0002] Vinyl acetylene, as a downstream product of acetylene, is an important fine chemical intermediate, which is widely used in the production of chloroprene rubber. Among them, chloroprene rubber (Chloroprene rubber, CR), as one of the seven synthetic rubbers, is a synthetic polymer material with broad application prospects in various fields of production and life. Based on the current situation of "rich coal, poor oil and little gas" in my country, the acetylene method (acetylene dimerization to produce vinyl acetylene, and then the reaction of vinyl acetylene and hydrogen chloride to produce chloroprene) is the main route for the production of neoprene in my country. Acetylene dimerization reaction to produce vinyl acetylene mainly adopts aqueous phase Nieuw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/30C07C11/30C07C2/38
CPCB01J31/30C07C2/38C07C2531/30C07C11/30Y02P20/584
Inventor 代斌李聪聪谢建伟
Owner SHIHEZI UNIVERSITY