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Method for preparing ethylene by heterogeneous reaction

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

Active Publication Date: 2015-08-12
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing ethylene by heterogeneous reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Mix hydrogen and other gases to form gas phase materials;

[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, use a liquid phase solvent with a surface tension of 0.01 mN / m to absorb acetylene 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 silicone with a concentration of 800ppm;

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

[0041] The reaction temperature of the multiphase reaction system is 110° C., and the reaction pressure is 5 M...

Embodiment 2

[0044] (1) Mix hydrogen and other gases to form gas phase materials;

[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, use a liquid phase solvent with a surface tension of 0.001 mN / m to absorb acetylene 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 300 ppm, and ionic liquid [BMIM] Br with a concentration of 600 ppm;

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

[0049] The reaction temperature of the multiphase reaction system is 140°C, and the reaction pressure is 7.5 MPa;

[0050] (...

Embodiment 3

[0052] (1) Mix hydrogen and other gases to form gas phase materials;

[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 2.0 MPa, use a liquid phase solvent with a surface tension of 0.08 mN / m to absorb acetylene to form a liquid phase material;

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

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

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

[0058] (4) According to the molar ratio o...

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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 hydrogen-containing gas-phase material; (2) absorbing acetylene with a liquid-phase solvent with the surface tension of at most 1mN / m to form a liquid-phase material; (3) providing a heterogeneous reaction system uniformly composed of the liquid-phase material, the gas-phase material and a hydrogenation catalyst, wherein the reaction temperature of the heterogeneous reaction system is 110-185 DEG C, and the reaction pressure is 2.5-7.5 MPa; and (4) introducing the gas-phase material and the liquid-phase material into the heterogeneous reaction system to perform continuous reaction according to the hydrogen / acetylene mole ratio of (3-9):1 at the operation air speed of 30000-90000 mL / (gcat.h), and separating the gas-phase product to obtain the product. The method provided by the invention overcomes the defects of temperature runaway, difficulty in transfer of reaction heat and great bed pressure drop in the fixed bed, and the detects of low reaction pressure, low productivity, lower ethylene selectivity and catalyst deactivation due to high tendency to producing green oil in the slurry reactor in the traditional methods for preparing ethylene by high-purity acetylene hydrogenation.

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 lack of oil and gas. With the depletion of petroleum resources, the development of coal chemical industry as a raw material chemical process has become an important process to replace the petrochemical route. In coal chemical technology, the preparation of acetylene from coal by calcium carbide process has been widely used. In recent years, the supply of polyvinyl chloride (PVC), the main downstream product of acetylene, has exceeded demand. The profitability of the PVC industry is not high, the entire process has backward production capacity, high energy consumption, and a large amount of waste residue, wastewater and mercury pollution. Moreover, the production capacity of China's calcium carbide industry is increasing year by year, and the capacity utilization rate of ...

Claims

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Application Information

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