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Method for preparation of ethylene from hydrogenation of acetylene and reaction tower for 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, etc. , 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: 2015-12-23
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 preparation of ethylene from hydrogenation of acetylene and reaction tower for the method
  • Method for preparation of ethylene from hydrogenation of acetylene and reaction tower for the method
  • Method for preparation of ethylene from hydrogenation of acetylene and reaction tower for the method

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Embodiment 1

[0031] A method for producing ethylene by hydrogenation of acetylene, comprising the steps of:

[0032] 1) Pack the granular catalyst and evenly load it 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 move 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 treatment, and then returned to the liquid phase inlet for recycling.

[0033] The nitrogen is switched to a mixed gas with a volume ratio of hydrogen and acetylene of 5:1, which is pressurized by the compressor and enters from the gas phase inlet at the lower part of the reaction tower, and moves from bottom to top in the reaction tower after being distributed by a gas distributor;

[0034] 2) The g...

Embodiment 2

[0040] A reaction tower used in the hydrogenation of acetylene to produce ethylene, the reaction tower is gas-liquid-solid three-phase mass transfer equipment, the diameter of the reaction tower is 600mm, and the total height is 5m. like Figure 1-3 As shown, its structure includes tower body 1, liquid phase inlet and outlet 7, 4, gas phase inlet and outlet 3, 8, tray 5, gas distributor 2, gas-liquid separator 9, downcomer 6;

[0041] Wherein, tray 5 is provided with 10 layers altogether, and spacing is 300mm; It comprises overflow port 11, liquid receiving plate 10 and reaction unit; Be provided with a plurality of spraying devices 12 in the reaction unit, and described spraying device comprises air riser 15 and spraying device Cover 14, the opening ratio of the injection device is 13%. Described gas riser 15 is conical, hollow, small head upwards, high 50mm; Described injection cover 14 is conical structure, and top evenly opens injection hole, and the bottom and tower tray...

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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 hydrogenation of acetylene and a reaction tower used in the method, belonging to the technical field of chemical material preparation methods. Background technique [0002] Ethylene is the most important basic raw material and is known as the "mother of the petrochemical industry". Using acetylene as raw material, hydrogenation under the action of selective hydrogenation catalyst to produce ethylene, combined with ethylene to produce PVC, can not only solve the problem of mercury consumption and mercury pollution in the process of direct production of PVC from acetylene in my country, but also further expand the coal chemical industry route, and at the same time provide The ethylene industry provides a new source of raw materials and reduces ethylene's dependence on petroleum resources and ethylene production costs, which has broad application prospects. [0003] At present, the process of pre...

Claims

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Application Information

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Patent Type & Authority Applications(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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