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Catalyst system for preparing vinyl chloride by hydrochlorinating acetylene and preparation and application thereof

A technology for chlorination to vinyl chloride and acetylene hydrochlorination, which is applied in catalyst carriers, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc. Environmental pollution and other problems, to achieve the effect of improving conversion rate, good chemical stability, and simplifying reaction equipment

Active Publication Date: 2010-11-10
于志勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The reaction temperature of acetylene hydrochlorination is relatively high, usually 150-180°C in industry, and these patents use common organic solvents or water as the catalyst dispersion system, and some solvents have low boiling points, such as water and ethanol; Severe volatilization at high temperature causes loss of solvent, requires additional cooling equipment, increases cost, limits the choice of reaction temperature, and causes environmental pollution
In addition, once the organic solvent leaks, the pollution will be serious and it will easily cause fire.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of catalyst system:

[0035] Dissolve 2.327g of copper chloride in 30.041g of N-butylpyridine bromide ([BPy]Br) ionic liquid, the concentration of copper chloride is 0.86mol / L, and dissolve in an oil bath at 100°C for 1h.

[0036] (2) Hydrochlorination of acetylene:

[0037] The above-mentioned catalyst system is directly used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.3, space velocity 24mL / mL·h, reaction at 160°C, hydrogen chloride activation time 1.5h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 53-57%, and the selectivity of vinyl chloride is greater than 99%.

[0038] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and odorless, has a large stable temperature range, and has good chemical stability. During use, t...

Embodiment 2

[0040] (1) Preparation of catalyst system:

[0041] 1.9423g of cuprous chloride was dissolved in 27.882g of N-butylpyridine hexafluorophosphate ionic liquid, and the concentration of cuprous chloride was 1mol / L. Dissolve in an oil bath at a temperature of 100°C for 2h.

[0042] (2) Hydrochlorination of acetylene:

[0043] The catalyst system prepared by the above steps is used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.43, space velocity 19mL / mL·h, reaction at 160°C, hydrogen chloride activation time 1.1h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 41-47%, and the selectivity of vinyl chloride is greater than 99%.

[0044] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and odorless, has a large stable temperature range, and has good chemi...

Embodiment 3

[0046] (1) Preparation of catalyst system:

[0047] Dissolve 1 g of platinum tetrachloride in 31.452 g of N-ethylpyridine chloride ionic liquid, and the concentration of platinum tetrachloride is 0.14 mol / L. Dissolve in an oil bath at a temperature of 120°C for 2h.

[0048] (2) Hydrochlorination of acetylene

[0049] The catalyst system prepared by the above steps is used in the reaction of acetylene hydrochlorination to generate vinyl chloride, and the molar ratio of reaction gas distribution is C 2 h 2 / HCl=1 / 1.2, space velocity 12mL / mL·h, reaction at 170°C, hydrogen chloride activation time 1h. Analysis of the reaction tail gas shows that the conversion rate of acetylene is 65-73%, and the selectivity of vinyl chloride is greater than 99%.

[0050] The catalyst system was weighed after the reaction with no mass loss. The catalyst system has almost no vapor pressure, is non-volatile, colorless, and odorless, has a large stable temperature range, and has good chemical st...

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PUM

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Abstract

The invention discloses a catalyst system for preparing vinyl chloride by hydrochlorinating acetylene, and preparation and application thereof. The catalyst system comprises a catalyst carrier and a catalyst, wherein the catalyst carrier is pyridine ionic liquid, and the catalyst is one or any combination of more than two of tin, palladium, gold, copper, manganese, bismuth, mercury and rhodium. The preparation method for the catalyst system comprises a step of dissolving the catalyst in the catalyst carrier. Acetylene gas and hydrogen chloride gas are mixed and then reacted in the presence of the catalyst system. The preparation process realizes a liquid phase reaction for preparing the vinyl chloride by hydrochlorinating the acetylene, avoids the loss of the catalyst system, is more environment-friendly and safer, and improves the conversion rate of the acetylene and the selectivity of the vinyl chloride.

Description

technical field [0001] The invention relates to a catalyst system for preparing vinyl chloride by hydrochlorination of acetylene and its preparation and application. Background technique [0002] Vinyl chloride (VCM) is mainly used to produce polyvinyl chloride (PVC). With the wide application of polyvinyl chloride materials, its demand continues to increase, about 8 to 10 million tons per year. At present, there are three methods for industrial production of vinyl chloride, namely, acetylene hydrochlorination, ethylene oxychlorination, and ethane oxychlorination. Although the technology of ethylene oxychlorination is mature and widely used in foreign countries, due to the rapid rise of oil prices, the price of ethylene has risen, especially in my country, which is rich in coal and has little oil. First, and widely distributed. Considering factors such as cost and process, the acetylene hydrochlorination method will remain the main raw material route for PVC production in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30B01J31/26B01J31/32B01J32/00B01J31/02C07C21/06C07C17/08
Inventor 于志勇曹少魁秦刚孙绍刚
Owner 于志勇
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