Mercury-free catalyst used for acetylene hydrochlorination for synthesizing vinyl chloride, and preparation method and application thereof

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 catalysts, physical/chemical process catalysts, etc., and can solve problems that are difficult to meet large-scale Industrial production needs, easy loss of metal salts, high cost and other issues

Active Publication Date: 2017-07-14
ZHONGKE YIGONG XIAMEN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Mercury-free catalyst used for acetylene hydrochlorination for synthesizing vinyl chloride, and preparation method and application thereof
  • Mercury-free catalyst used for acetylene hydrochlorination for synthesizing vinyl chloride, and preparation method and application thereof
  • Mercury-free catalyst used for acetylene hydrochlorination for synthesizing vinyl chloride, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0097] Example 1

[0098] (1) Weigh 76.12g CuCl 2 ·2H 2 O and 8g of N-methylpyrrolidone are dissolved in 315.88g of deionized water to obtain an impregnating solution containing copper chloride and N-methylpyrrolidone;

[0099] (2) Set the specific surface area to 700~1500m 2 / g, the carbon tetrachloride adsorption value is 50-70%, the ash value is less than 6%, and the acid-washed granular activated carbon is soaked in the above-prepared solution at room temperature. The soaking temperature is controlled to 70°C. 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, spin-dry, and dry by passing hydrogen chloride gas at 120°C to obtain the required catalyst A1;

[0101] (4) Put C 2 H 2 And HCl mixed gas (C 2 H 2 The molar ratio of HCl to HCl is 1:1.1) It is introduced into a first-stage tubular reactor equipped with catalyst A1 to carry out hydrochlorination reaction. The cooling temperatu...

Example Embodiment

[0103] Example 2

[0104] (1) Weigh 58.5g CuCl 2 ·2H 2 O and 12 g of 2-pyrrolidone and 84 g of deionized water to obtain an impregnating solution containing copper chloride and 2-pyrrolidone;

[0105] (2) Set the specific surface area to 700~1500m 2 / g, carbon tetrachloride adsorption value is 50-70%, ash value is less than 6%, and the acid-washed granular activated carbon is immersed in the above prepared solution at room temperature. The soaking temperature is controlled to room temperature, and the volume of the 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, spin dry, and dry by passing hydrogen chloride gas at 120°C to obtain the required catalyst A2;

[0107] (4) Put C 2 H 2 And HCl mixed gas (C 2 H 2 The molar ratio of HCl to HCl is 1:1.05) It is passed into the first-stage tubular reactor equipped with catalyst A2 to carry out the hydrochlorination re...

Example Embodiment

[0109] Example 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) Set the specific surface area to 700~1500m 2 / g, carbon tetrachloride adsorption value is 50-70%, ash value is less than 6%, and the acid-washed granular activated carbon is immersed in the above-prepared solution at room temperature. The soaking temperature is controlled to 50℃, and the solution and activated carbon are controlled. 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, spin dry, and dry by passing hydrogen chloride gas at 150°C to obtain the required catalyst A3;

[0113] (4) Put C 2 H 2 And HCl mixed gas (C 2 H 2 The molar ratio of HCl to HCl is 1:1.05) It is passed into the first-stage tubular reactor equipped with catalyst A3 to carry out the hydro...

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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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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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