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A kind of mercury-free catalyst for the synthesis of vinyl chloride by acetylene hydrochlorination and its preparation method and application

A technology for the synthesis of vinyl chloride and mercury catalysts by hydrochlorination of acetylene, which is applied in the direction of hydrogen halide addition preparation, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., which can solve the problem of scarce resources and high cost , easy loss of metal salts, etc.

Active Publication Date: 2019-08-30
ZHONGKE YIGONG XIAMEN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a higher acetylene conversion rate and vinyl chloride selectivity, since the catalyst system prepared by this method needs to react at a temperature of 140-220 ° C, the metal salt is easy to lose, resulting in poor stability of the catalyst and cannot meet industrial requirements. Require
[0015] Based on the above technical background, the precious metal catalysts currently developed have the problem of high cost due to scarcity of resources; although non-precious metal catalysts solve the cost problem, there are still various other technical defects, making it difficult for both of them to meet large-scale industrial production. need

Method used

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  • A kind of mercury-free catalyst for the synthesis of vinyl chloride by acetylene hydrochlorination and its preparation method and application
  • A kind of mercury-free catalyst for the synthesis of vinyl chloride by acetylene hydrochlorination and its preparation method and application
  • A kind of mercury-free catalyst for the synthesis of vinyl chloride by acetylene hydrochlorination and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] (1) Weigh 76.12g CuCl 2 2H 2 O and 8g N-Methylpyrrolidone are dissolved in the deionized water of 315.88g, obtain the impregnation solution containing copper chloride and N-Methylpyrrolidone;

[0099] (2) The specific surface area is 700 ~ 1500m 2 / g, the carbon tetrachloride adsorption value is 50~70%, and the granular activated carbon after the ash content is less than 6% is soaked in the above-mentioned prepared solution at room temperature, and the control soaking temperature is 70 ℃, the solution and activated carbon The volume ratio is 2:1, soak until the concentration of copper chloride in the solution is constant;

[0100] (3) filter the soaked activated carbon, dry it, and dry it with hydrogen chloride gas at 120°C to obtain the required catalyst A1;

[0101] (4) put C 2 h 2 Mixed gas with HCl (C 2 h 2 and HCl molar ratio of 1:1.1) into the first-stage tube reactor equipped with catalyst A1 for hydrochlorination reaction, the cooling temperature in the j...

Embodiment 2

[0104] (1) Weigh 58.5g CuCl 2 2H 2 0 and 12g 2-pyrrolidone 84g deionized water, obtain the impregnation solution containing copper chloride and 2-pyrrolidone;

[0105] (2) The specific surface area is 700 ~ 1500m 2 / g, the carbon tetrachloride adsorption value is 50~70%, the ash value is less than 6%. The granular activated carbon after pickling is soaked in the above-mentioned prepared solution at room temperature, and the control soaking temperature is room temperature, the volume of solution and activated carbon The ratio is 1.5:1, soak until the concentration of copper chloride in the solution is constant;

[0106] (3) filter the soaked activated carbon, dry it, and dry it with hydrogen chloride gas at 120°C to obtain the required catalyst A2;

[0107] (4) put C 2 h 2 Mixed gas with HCl (C 2 h 2 The molar ratio of HCl and HCl is 1:1.05) into the first-stage tube reactor equipped with catalyst A2 for hydrochlorination reaction, the reaction temperature is controlled ...

Embodiment 3

[0110] (1) Weigh 50.75g CuCl 2 2H 2 O and 6g N-methylcaprolactam are dissolved in 143.25g deionized water to obtain an impregnation solution containing copper chloride and N-methylcaprolactam;

[0111] (2) The specific surface area is 700 ~ 1500m 2 / g, the adsorption value of carbon tetrachloride is 50-70%, and the ash value is less than 6%. The granular activated carbon after pickling is soaked in the above-mentioned prepared solution at room temperature, and the soaking temperature is controlled to be 50°C. The volume ratio is 1:1, soak until the concentration of copper chloride in the solution is constant;

[0112] (3) Filter the soaked activated carbon, dry it, and dry it with hydrogen chloride gas at 150°C to obtain the required catalyst A3;

[0113] (4) put C 2 h 2 Mixed gas with HCl (C 2 h 2 and HCl molar ratio of 1:1.05) into the first-stage tube reactor equipped with catalyst A3 for hydrochlorination reaction, the cooling temperature in the jacket is controlled...

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Abstract

The invention relates to a mercury-free catalyst used for acetylene hydrochlorination for synthesizing vinyl chloride, and a preparation method and an application thereof. The preparation method comprises the following steps: 1, dissolving alkali metal salt and an amide solvent in water to prepare a mixed solution; 2, adding active carbon into the mixed solution obtained in step 1, and dipping the active carbon; and 3, filtering the active carbon obtained in step 2, draining the filtered active carbon, and heating and drying the drained active carbon to obtain the catalyst. The concentration of raw gas on the surface of the catalyst is increased through using the synergism of the alkali metal salt and the amide solvent and the adsorbing and dissolving ability of the amide solvent to raw materials comprising acetylene and hydrogen chloride, and the amide solvent is a high-polarity aprotic polar solvent, and has a polarization effect on reactants, so the reaction efficiency is further improved, the low temperature activity of the catalyst is high, and the selectivity and the stability are good.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and in particular relates to a mercury-free catalyst for acetylene hydrochlorination to synthesize vinyl chloride, a preparation method and application thereof. Background technique [0002] Vinyl chloride monomer is the basic raw material for the synthesis of various chemical products. Its main use is to produce polyvinyl chloride. Due to its good physical, chemical and mechanical properties, polyvinyl chloride is widely used in various fields. With the sustained and rapid development of the national economy, the demand for polyvinyl chloride is also increasing. Under the decision of my country's energy structure environment of "lack of oil, poor gas, and rich coal", the preparation of vinyl chloride by acetylene hydrochlorination is currently the most in line with the development requirements of my country's energy structure, but this process mainly uses chlorination in the production of vinyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/30C07C17/08C07C21/06
Inventor 钟劲光刘瑞艳刘星
Owner ZHONGKE YIGONG XIAMEN CHEM TECH
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