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Structured non-mercuric catalyst, and preparation method and application thereof

A non-mercury catalyst, structured technology, used in physical/chemical process catalysts, hydrogen halide addition preparation, chemical instruments and methods, etc., can solve the problems of catalyst performance degradation, reactor overheating, poor thermal conductivity, etc. The effect of generating, lowering the reaction temperature, and reducing the production cost

Inactive Publication Date: 2013-06-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of low loading capacity, the catalyst can obtain higher acetylene conversion rate and selectivity by adding hydrogen chloride to acetylene to produce vinyl chloride monomer. However, activated carbon is still used as the carrier in the catalyst, and the thermal conductivity of the carrier Poor, easily lead to local overheating of the reactor and degradation of catalyst performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The carrier used in Example 1 (provided by the Institute of Metal Research, Chinese Academy of Sciences) is composed of 90% by weight of foamed silicon carbide and 10% by weight of activated carbon, and the activated carbon is adhered to the foamed silicon carbide. Foamed silicon carbide is spherical with a diameter of 5mm, the pore diameter of foamed silicon carbide is 1mm to 1.5mm, and the specific surface area is 55m 2 / g, activated carbon is 100-200 mesh (74μm-148μm) particles.

[0039] Dissolve 0.005g of chloroauric acid uniformly in 20mL of water to make a solution, impregnate 10g (13mL) of the carrier in the above solution, let it stand at a constant temperature of 70°C for 2h, and then dry it at 140°C for 14 hours to obtain a structured non-mercury catalyst .

[0040] Pass acetylene and hydrogen chloride into the reactor equipped with 10 g of the above-mentioned structured non-mercury catalyst according to the molar ratio of 1:1.1, and react at 120°C under norm...

Embodiment 2

[0043] The carrier used in Example 2 is the same as that used in Example 1.

[0044] Dissolve 0.01g of chloroauric acid uniformly in 20mL of water to make a solution, impregnate 10g (13mL) of the carrier in the above solution, let it stand at a constant temperature of 70°C for 2h, and then dry it at 140°C for 14 hours to obtain a structured non-mercury catalyst .

[0045] Pass acetylene and hydrogen chloride into the reactor equipped with 10 g of the above-mentioned structured non-mercury catalyst according to the molar ratio of 1:1.1, and react at 120°C under normal pressure at a space velocity of 120 / h. The conversion rate of acetylene is 98.3%, and the selectivity of vinyl chloride is 99%.

Embodiment 3

[0047] The carrier used in Example 3 is the same as that used in Example 1.

[0048] Dissolve 0.01g of chloroauric acid and 0.1g of cupric chloride in 20mL of water to make a solution, soak 10g (13mL) of the carrier in the above solution, let it stand at a constant temperature of 70°C for 2h, and then dry it at 140°C for 14 hours to prepare non-mercury catalyst.

[0049] Pass acetylene and hydrogen chloride into the reactor equipped with 10 g of the above-mentioned structured non-mercury catalyst according to the molar ratio of 1:1.1, and react at 120°C under normal pressure at a space velocity of 120 / h. The conversion rate of acetylene is 99.7%, and the selectivity of vinyl chloride is 99%.

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Abstract

The invention discloses a structured non-mercuric catalyst. The structured non-mercuric catalyst is composed of 80-99.9wt% of a carrier, 0.01-10wt% of an active component and 0-19.99wt% of an assistant; and the carrier is composed of 60-95wt% of silicon carbide foam and 5-40wt% of active carbon, and the active carbon is adhered to the silicon carbide foam. The structured non-mercuric catalyst has a high catalytic activity when the catalyst is used in an acetylene hydrochlorinating reaction for preparing chloroethylene. The structured non-mercuric catalyst solves a mercury pollution problem, and utilizes the good heat conduction property of the silicon carbide foam to rapidly remove heat in order to avoid the temperature runway of a bed, so the production capacity and the product quality are improved. The invention also discloses a preparation method of the structured non-mercuric catalyst. The preparation method comprises the following steps: dissolving the active component and the assistant in water to prepare a solution, immersing the carrier in the solution at 60-80DEG C for 1-3h, and drying to obtain the structured non-mercuric catalyst. The preparation method has the advantages of simplicity, strong operability and good controllability.

Description

technical field [0001] The invention relates to the field of catalysts for the production of vinyl chloride, in particular to a structured non-mercury catalyst supported by silicon carbide and activated carbon, a preparation method thereof and an application in the reaction of preparing vinyl chloride by hydrochlorination of acetylene. Background technique [0002] Vinyl chloride (VCM) is an important chemical basic raw material, and the existing industrial production mainly includes ethylene method and acetylene method. In the ethylene method, the oxychlorination reaction of ethylene, hydrogen chloride and oxygen is performed first, or ethylene dichloride is chlorinated to generate dichloroethane, and dichloroethane is pyrolyzed to generate vinyl chloride, and at the same time, the by-product hydrogen chloride is produced. The acetylene method is a method in which acetylene and hydrogen chloride are catalyzed to directly generate vinyl chloride. [0003] The acetylene proc...

Claims

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Application Information

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IPC IPC(8): B01J27/224C07C21/06C07C17/08
Inventor 蒋斌波田晓晖阳永荣王靖岱黄正梁廖祖伟
Owner ZHEJIANG UNIV
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