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Composite low-mercury complex catalyst used in vinyl chloride synthesis, and preparation method thereof

A catalyst and complex technology, applied in the field of compound low-mercury complex catalyst and its preparation, can solve the problems of rapid deactivation, environmental pollution, easy loss, etc., and achieve the effects of increasing reaction activity and reducing sublimation loss.

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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high mercury chloride content, poor thermal stability, easy loss, fast deactivation, and serious environmental pollution of the traditional high-mercury catalyst used in the production of acetylene-based vinyl chloride, and further provide a catalyst with high catalytic activity. A compound low-mercury complex catalyst for synthesizing vinyl chloride with strong stability and preparation method thereof

Method used

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  • Composite low-mercury complex catalyst used in vinyl chloride synthesis, and preparation method thereof

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Effect test

Embodiment 1

[0023] (1) Dissolve 0.2715g (0.001mol) of mercuric chloride in dilute hydrochloric acid, add it to 10g of activated carbon, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain a mercuric chloride catalyst.

[0024] (2) Dissolve 0.2641g (0.001mol) of 18-crown-6 in dilute hydrochloric acid under stirring, add dropwise the mercuric chloride catalyst prepared in step (1) after clarification, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours. A mercury complex catalyst was obtained.

[0025] (3) Dissolve 0.35g of potassium chloride and 0.20g of ferric chloride in dilute hydrochloric acid, add the mercury complex catalyst prepared in step (2) after clarification, soak at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain the compound low Mercury complex catalyst.

Embodiment 2

[0027] (1) Dissolve 0.4072g (0.0015mol) of mercuric chloride in dilute hydrochloric acid, add it to 10g of activated carbon, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain a mercuric chloride catalyst.

[0028] (2) Dissolve 3.0g (0.0015mol) PEG2000 in dilute hydrochloric acid under stirring, add dropwise the mercuric chloride catalyst prepared in step (1) after clarification, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain mercury complex material catalyst.

[0029] (3) Dissolve 0.6820g of copper chloride in dilute hydrochloric acid, add the mercury complex catalyst prepared in step (2) after clarification, soak at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain a compound low-mercury complex catalyst.

Embodiment 3

[0031] (1) Dissolve 0.3258g (0.0012mol) of mercuric chloride in dilute hydrochloric acid, add it to 10g of activated carbon, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain a mercuric chloride catalyst.

[0032] (2) Dissolve 1.3216g (0.006mol) of 15-crown-5 in dilute hydrochloric acid under stirring, add dropwise the mercuric chloride catalyst prepared in step (1) after clarification, impregnate at room temperature for 8 hours, and dry at 120°C for 8 hours. A mercury complex catalyst was obtained.

[0033] (3) Dissolve 0.12g of ferric chloride and 0.4089g of zinc chloride in dilute hydrochloric acid, add the mercury complex catalyst prepared in step (2) after clarification, immerse at room temperature for 8 hours, and dry at 120°C for 8 hours to obtain the compound low Mercury complex catalyst.

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Abstract

The invention discloses a composite low-mercury complex catalyst used in vinyl chloride synthesis, and a preparation method thereof. According to the catalyst, active carbon is adopted as a carrier. An active component is a complex formed by an organic ligand and mercury chloride. A co-catalyst is one or more selected from potassium chloride, iron chloride, zinc chloride and copper chloride. According to the catalyst, polyethylene glycol or a crown ether compound is adopted as the ligand, and is subjected to a coordination reaction with mercury ions, such that a stable ring complex is formed, and mercury ions are anchored in active carbon pores. Therefore, mercury element sublimation loss is reduced. According to the invention, a step-by-step impregnation method is adopted. The preparation method is simple; catalyst activity is high; and catalyst stability is high.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a compound low-mercury complex catalyst for synthesizing vinyl chloride and a preparation method thereof. [0002] Background technique [0003] Vinyl chloride is an important raw material for organic synthesis, and its main use is to produce polyvinyl chloride. At present, there are two main methods for the synthesis of vinyl chloride: the acetylene method and the ethylene method. At present, most vinyl chloride monomers in my country are mainly produced by the acetylene process. [0004] At present, the acetylene method of vinyl chloride mostly uses activated carbon-supported mercuric chloride as a catalyst, and is carried out in a fixed-bed reactor, with a mercuric chloride loading of 10.5% to 12.5%. This kind of catalyst has a high mercury content, and its stability is very poor, it is easy to sublimate and lose, and its catalytic performance decays quickly. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30C07C17/08C07C21/06
Inventor 孟纪文邵玉昌左洪亮林春迎
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