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Method for synthesizing vinylacetylene through acetylene dimerization

A technology of vinyl acetylene and acetylene di, which is applied in the field of chemical process intensification, can solve the problems of complex process, high production cost, and low vinyl acetylene selectivity of single-pass conversion of acetylene, and achieve high catalytic activity, low price and high inhibition The effect of polymer formation

Inactive Publication Date: 2012-11-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of complex process of acetylene dimerization into vinyl acetylene in the prior art, high production cost, low conversion rate of acetylene and low selectivity of vinyl acetylene, the present invention proposes a kind of acetylene dimerization into ethylene acetylene method

Method used

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  • Method for synthesizing vinylacetylene through acetylene dimerization

Examples

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specific Embodiment 1

[0019] ① Dissolve 0.3 kmol ammonium chloride and 0.1 kmol urea in a small amount of water, and add them into a reactor with 45 L of water; 3 / h flow rate into the nitrogen exhaust air, at the same time, bubbling and stirring to fully dissolve the ammonium chloride and urea;

[0020] ② Keep the reaction temperature at 70~90°C, continue to pass nitrogen gas to evacuate and stir for 30 minutes by bubbling, then add 0.3 kmol of cuprous chloride and 0.3 L of concentrated hydrochloric acid in sequence; the content of cuprous chloride is ≥97 % cuprous chloride, the mass percentage concentration of described hydrochloric acid is 37%~38%;

[0021] ③Keep the reaction temperature at 70~90℃, continue to pass nitrogen gas to evacuate and stir with bubbling. After the cuprous chloride is fully dissolved, replace the nitrogen with acetylene, and the flow rate of acetylene is controlled at 280~320 Nm 3 / h, keep the reaction temperature at 70~90°C, and stir with bubbling to make the dimerizat...

specific Embodiment 2

[0023] ① Dissolve 0.24 kmol of ammonium chloride and 0.08 kmol of urea in a small amount of water and add to a reactor containing 45 L of water; 3 / h flow rate into the nitrogen exhaust air, at the same time, bubbling and stirring to fully dissolve the ammonium chloride and urea;

[0024] ② Keep the reaction temperature at 70~90°C, continue to pass nitrogen gas to evacuate and stir for 30 minutes, then add 0.3 kmol cuprous chloride and 0.3 L concentrated hydrochloric acid; the cuprous chloride is ≥97% Cuprous chloride, the mass percentage concentration of described hydrochloric acid is 37%~38%;

[0025] ③Keep the reaction temperature at 70~90℃, continue to pass nitrogen gas to evacuate and stir with bubbling. After the cuprous chloride is fully dissolved, replace the nitrogen with acetylene, and the flow rate of acetylene is controlled at 280~320 Nm 3 / h, keep the reaction temperature at 70~90°C, and stir with bubbling to make the dimerization of acetylene to obtain vinyl ace...

specific Embodiment 3

[0027] ① Dissolve 0.18 kmol of ammonium chloride and 0.06 kmol of urea in a small amount of water, and add to a reactor equipped with 45 L of water; 3 / h flow rate into the nitrogen exhaust air, at the same time, bubbling and stirring to fully dissolve the ammonium chloride and urea;

[0028] ② Keep the reaction temperature at 70~90°C, continue to pass nitrogen gas to evacuate and stir for 30 minutes, then add 0.3 kmol cuprous chloride and 0.3 L concentrated hydrochloric acid; the cuprous chloride is ≥97% Cuprous chloride, the mass percentage concentration of described hydrochloric acid is 37%~38%;

[0029] ③Keep the reaction temperature at 70~90℃, continue to pass nitrogen gas to evacuate and stir with bubbling. After the cuprous chloride is fully dissolved, replace the nitrogen with acetylene, and the flow rate of acetylene is controlled at 280~320 Nm 3 / h, keep the reaction temperature at 70~90°C, and stir with bubbling to make the dimerization of acetylene to obtain vinyl...

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Abstract

The invention provides a method for synthesizing vinylacetylene through acetylene dimerization by aiming at the problems that in the prior art, the process for synthesizing vinylacetylene through acetylene dimerization is complicated, the production cost is too high, the single process conversion rate of the acetylene and the selectivity of the vinylacetylene are not high, and the like. According to the method, cuprous chloride is adopted as major catalysts, urea is adopted as cocatalysts, ammonium chloride is adopted as cosolvents, water is adopted as solvents, hydrochloric acid provides acid environment required by the reaction, and the reaction temperature is 70 to 90 DEG C, wherein in 45L water, the addition of the cuprous chloride is 0.30kmol, the addition of the urea is 0.06kmol to 0.14 kmol, the addition of ammonium chloride is 0.18kmol to 0.42kmol, and the addition of the hydrochloric acid is 0.3L. The dissolution of the ammonium chloride and the cuprous chloride is accelerated, the operation time before the reaction is shortened, the generation of high polymers is inhibited, the condition of air path blockage caused by polymers is avoided, and the method belongs to a novel, efficient, stable, environment-friendly and economic synthesis method.

Description

technical field [0001] The invention belongs to the field of chemical process intensification, and relates to an intensified method for synthesizing vinyl acetylene through a dimerization reaction of acetylene, in particular to a method for dimerizing acetylene into vinyl acetylene. Background technique [0002] Vinyl acetylene produced by acetylene dimerization can be used in the production of chemical products such as chloroprene rubber, 4-chlorophthalic anhydride, and vinyl polymers. Therefore, a lot of energy has been devoted to research in industrial production. The industrial application of the technology of acetylene dimerization to produce vinyl acetylene benefited from the Nieuwlan catalyst invented by Nieuwland in the 1930s. However, there are many disadvantages in the practical application of this technology, such as many by-products, low yield and selectivity of vinyl acetylene, etc. Therefore, from the 1950s, improved methods for Nieuwland catalysts came into b...

Claims

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Application Information

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IPC IPC(8): C07C11/30C07C2/38
Inventor 刘作华余亚玲陶长元杜军刘仁龙范兴彭敏孙大贵左赵宏马纪祥谢昭明李泽全
Owner CHONGQING UNIV
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