A kind of method for preparing ethylene by heterogeneous reaction

A heterogeneous reaction, ethylene technology, applied in the fields of hydrogenation to hydrocarbons, organic chemistry, etc., can solve the problems of difficult bed heat transfer, decrease in ethylene yield, increase in side reactions, etc., to increase the surface area of ​​gas-liquid contact and reduce the yield. , the effect of low saturated vapor pressure

Active Publication Date: 2017-08-08
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogenation of acetylene is a strong exothermic reaction. Hydrogenation of high-concentration acetylene releases a large amount of reaction heat, which makes it difficult to transfer heat in the bed, which can easily lead to catalyst deactivation, increased side reactions, and decreased ethylene yield. Therefore, for high-concentration acetylene as raw material The method of catalytic selective hydrogenation to ethylene has been rarely explored, and the corresponding large-scale industrial application has not been reported.

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  • A kind of method for preparing ethylene by heterogeneous reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Mixing hydrogen with other gases to form a gas phase material;

[0037] The other gases include: CO 0ppm, CO 2 0ppm, CH 4 50ppm, C 2 h 6 500ppm, C 3 h 8 200ppm, butadiene 200ppm;

[0038] (2) Under the condition of 2.0MPa, absorb acetylene with a liquid phase solvent whose surface tension is 0.01mN / m to form a liquid phase material;

[0039] The liquid phase solvent is composed of the following components: N-methylpyrrolidone, fatty alcohol polyoxyethylene ether, p-methoxyphenol with a concentration of 500ppm, and composite organosilicon with a concentration of 800ppm;

[0040] (3) Provide a heterogeneous reaction system consisting of the liquid phase material, the gas phase material and a hydrogenation catalyst; the selective hydrogenation catalyst is Pd / Al 2 o 3 Solid particle catalyst as the active component, the particle size of the catalyst is 75-100 μm;

[0041] The reaction temperature of the heterogeneous reaction system is 110°C, and the reaction pr...

Embodiment 2

[0044] (1) Mixing hydrogen with other gases to form a gas phase material;

[0045] The other gases include: CO 50ppm, CO 2 50ppm, CH 4 20ppm, C 2 h 6 300ppm, C 3 h 8 100ppm, butadiene 100ppm;

[0046] (2) Under the condition of 2.0MPa, absorb acetylene with a liquid phase solvent with a surface tension of 0.001mN / m to form a liquid phase material;

[0047] The liquid phase solvent is composed of the following components: tetrahydrofuran, petroleum carboxylate, phenothiazine with a concentration of 300ppm, and an ionic liquid [BMIM]Br with a concentration of 600ppm;

[0048] (3) Provide a heterogeneous reaction system uniformly composed of the liquid phase material, the gas phase material and a hydrogenation catalyst; the selective hydrogenation catalyst is a solid particle catalyst with Pd-Ag / ZSM-5 as an active component , the particle size of the catalyst is 0.1-1 μm;

[0049] The reaction temperature of the heterogeneous reaction system is 140°C, and the reaction pre...

Embodiment 3

[0052] (1) Mixing hydrogen with other gases to form a gas phase material;

[0053] The other gases include: CO 20ppm, CO 2 20ppm, CH 4 20ppm, C 2 h 6 100ppm, C 3 h 8 80ppm, butadiene 100ppm;

[0054] (2) Under the condition of 2.0MPa, absorb acetylene with a liquid phase solvent whose surface tension is 0.08mN / m to form a liquid phase material;

[0055] The liquid phase solvent is composed of the following components: N-methylpyrrolidone, sodium dodecylbenzenesulfonate, benzoquinone with a concentration of 800ppm, and ionic liquid [BMIM]Cl with a concentration of 800ppm;

[0056] (3) providing a heterogeneous reaction system uniformly composed of the liquid phase material, the gas phase material and a hydrogenation catalyst; the selective hydrogenation catalyst is a solid monolithic catalyst with Pd-Ag-Pt as an active component;

[0057] The reaction temperature of the heterogeneous reaction system is 185°C, and the reaction pressure is 4.0MPa;

[0058] (4) According t...

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Abstract

The invention relates to a method for preparing ethylene by heterogeneous reaction. The method comprises the following steps: (1) providing a gas-phase material containing hydrogen; (2) absorbing acetylene with a liquid-phase solvent with a surface tension ≤ 1mN / m to form a liquid-phase material; (3) providing a liquid-phase material composed of the liquid-phase material, The heterogeneous reaction system composed of the gas phase material and the hydrogenation catalyst; the reaction temperature of the multiphase reaction system is 110-185°C, and the reaction pressure is 2.5-7.5MPa; (4) according to the molar ratio of hydrogen to acetylene is 3 ~9:1, the gas phase material and the liquid phase material are passed into the multiphase reaction system for continuous reaction, the operating space velocity is 30000~90000mL / (gcat.h), and the gas phase product is separated to obtain the product. The method provided by the invention avoids the high-purity acetylene hydrogenation to produce ethylene in the traditional method, which avoids the high-purity acetylene hydrogenation fixed bed overheating, difficulty in heat transfer, large bed pressure drop, low slurry bed reaction pressure, small production capacity, and low ethylene selectivity , Easy by-product green oil causes catalyst deactivation defects.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to an improved method for preparing ethylene. Background technique [0002] my country is a country rich in coal and short of oil and gas. With the depletion of petroleum resources, the development of coal chemical industry as raw material chemical process has become an important process to replace the petrochemical route. In coal chemical technology, the production of acetylene by calcium carbide process using coal as raw material has been widely used. In recent years, the main downstream product of acetylene, polyvinyl chloride (PVC), has been oversupplied. The PVC industry is not profitable. The entire process has backward production capacity, high energy consumption, and produces a large amount of waste residue, waste water and mercury pollution. Moreover, the production capacity of China's calcium carbide industry is increasing year by year, and the capacity utilization rate ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C07C11/04C07C5/09
Inventor余海鹏史雪君车中山吴道洪
OwnerBEIJING HUAFU ENG