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Method for preparing ethylene by hydrogenation of acetylene and reaction tower used in the method

A technology of acetylene hydrogenation and reaction tower, which is applied in the fields of hydrogenation to hydrocarbons, chemical instruments and methods, organic chemistry, etc., and can solve problems such as difficulty in removing heat from overheating reactions, difficulty in uniform mixing of liquid and solid, and easy blockage of gas distributors. , to achieve the effect of solving mercury pollution, expanding the coal chemical industry route, and avoiding the overheating of the fixed bed

Active Publication Date: 2017-11-14
北京锦泰诚瑞科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for hydrogenation of acetylene to ethylene, which can realize gas-liquid-solid three-phase reaction, and solve the problem of "flying temperature" of high-purity acetylene hydrogenation fixed bed and difficult removal of reaction heat. It avoids the defects of large bed pressure drop, acetylene polymerization to produce green oil covering the catalyst, and at the same time overcomes the difficulty of uniform mixing of gas, liquid and solid in the slurry bed, easy deposition of catalyst particles, easy blockage of gas distributor and the amount of liquid phase solvent major defects

Method used

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  • Method for preparing ethylene by hydrogenation of acetylene and reaction tower used in the method
  • Method for preparing ethylene by hydrogenation of acetylene and reaction tower used in the method
  • Method for preparing ethylene by hydrogenation of acetylene and reaction tower used in the method

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Embodiment 1

[0031] A method for preparing ethylene by hydrogenating acetylene, including the following steps:

[0032] 1) Pack the granular catalyst evenly on the tray, and purge the reaction pipeline and equipment with inert gas. After the oxygen content is qualified, the liquid phase solvent N-methyl-2-pyrrolidone is pumped in from the liquid phase inlet And it moves from top to bottom. When the liquid level at the bottom of the reaction tower reaches 50%, the liquid phase solvent is continuously extracted from the liquid phase outlet, sent to the regeneration or heat exchange unit for processing, and then returned to the liquid phase inlet for recycling.

[0033] Switch the nitrogen to a mixture of hydrogen and acetylene with a volume ratio of 5:1, pressurized by the compressor, enter from the gas phase inlet of the lower part of the reaction tower, distribute through the gas distributor, and move from bottom to top in the reaction tower;

[0034] 2) The gas and liquid phases come into contac...

Embodiment 2

[0040] The invention relates to a reaction tower used in a method for hydrogenating acetylene to produce ethylene. The reaction tower is a gas-liquid-solid three-phase mass transfer device, the diameter of the reaction tower is 600mm, and the total height is 5m. Such as Figure 1-3 As shown, the structure includes tower body 1, liquid phase inlets and outlets 7, 4, gas phase inlets and outlets 3, 8, trays 5, gas distributor 2, gas-liquid separator 9, and downcomer 6;

[0041] Among them, the tray 5 is provided with 10 layers with a distance of 300mm; it includes an overflow port 11, a liquid receiving tray 10 and a reaction unit; the reaction unit is equipped with a plurality of spray devices 12, the spray device includes a gas riser 15 and spray Cover 14, the opening rate of the spray device is 13%. The gas riser 15 is conical, hollow, with a small head facing upwards, and 50mm high; the spray hood 14 has a conical structure, with spray holes evenly opened on the upper part, an...

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Abstract

The present invention relates to reaction tower applied to hydrogenation of acetylene to ethylene and ethylene preparation method by using the reaction tower. The reaction tower is gas-liquid-solid three phase mass transfer equipment, and a tray is equipped with an ejection device. The reaction tower and preparation method of the present invention can solve the problem of temperature runaway of a fixed bed for hydrogenation of high-purity acetylene to ethylene, and difficulty in reaction heat removal, and avoid the defects of large bed pressure drop and catalyst deactivation caused by coverage of green oil generated in acetylene polymerization; at the same time, the invention overcomes the defects of difficulty in uniform mixing of gas, liquid and solid in slurry reactor, easy deposition of catalyst particles, easy obstruction of the gas distributor and a large amount of liquid solvent usage.

Description

Technical field [0001] The invention relates to a method for preparing ethylene by hydrogenating acetylene and a reaction tower used in the method, and belongs to the technical field of preparation methods of chemical materials. Background technique [0002] Ethylene is the most important basic raw material and is called "the mother of petrochemical industry". Using acetylene as a raw material, hydrogenation to produce ethylene under the action of a selective hydrogenation catalyst, combined with ethylene to produce PVC, can not only solve the problem of mercury consumption and mercury pollution in the direct production of PVC from traditional acetylene in my country, but also further expand the coal chemical route. The ethylene industry provides a new source of raw materials and reduces the dependence of ethylene on petroleum resources and the production cost of ethylene, which has broad application prospects. [0003] At present, the process of preparing ethylene by catalytic sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C5/09B01J8/02
Inventor 余海鹏史雪君车中山吴道洪
Owner 北京锦泰诚瑞科技发展有限公司
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