Catalytic rectification packing with radial distribution capacity

A technology of radial distribution and catalytic rectification, applied in the field of structured packing, can solve the problems of large resistance in mass transfer and diffusion process, increase the resistance of mass transfer, and reduce the radial distribution capacity of packing, so as to improve the reaction and separation efficiency, improve the The ability of radial distribution, the effect of improving the effect of radial distribution

Active Publication Date: 2014-04-30
CHINA CONSTR IND & ENERGY ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the transfer of materials through bagging, the resistance of the mass transfer and diffusion process is large, resulting in poor radial distribution and low overall reaction efficiency.
European patent 0448884 proposes that the inert particles with a cavity in the center are packed with wire mesh and then evenly mixed with the catalyst as the packing internal components of the catalytic rectification tower, but such components cause channeling and short-circuiting of gas-liquid two-phase
Channeling and short circuit phenomena increase the mass transfer resistance and reduce the radial distribution capacity of the filler, thereby affecting the efficiency of reactive distillation

Method used

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  • Catalytic rectification packing with radial distribution capacity
  • Catalytic rectification packing with radial distribution capacity
  • Catalytic rectification packing with radial distribution capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In the C4 catalytic rectification pretreatment unit, the C4 fraction from the MTBE unit has a relatively high content of dienes and dimethyl ether, etc., which cannot be directly used as raw materials for the alkylation reaction and require pretreatment. Using catalytic rectification technology, hydrofining and dimethyl ether removal are simultaneously completed in the catalytic rectification tower. The packing adopts window diversion packing and metal rolling orifice plate corrugated packing, and each layer adopts structured packing with n=1, among which structure A and structure B are respectively composed of 24 packing sheets, a total of 48 packing sheets. The catalyst is packed in packing sheets in structure A. The diameter of the tower is DN900, the height of the plate is 120mm, and the upper and lower plates are rotated 180° for installation. Comparing the catalytic rectification filler of the present invention with the use of ordinary bundled catalysts, experime...

Embodiment 2

[0029] In the liquid-solid three-phase catalytic rectification equipment of benzene chloride gas, chlorine gas reacts with benzene to generate chlorinated benzene. The packing adopts window-opening diversion packing and metal rolling orifice corrugated packing, and each layer adopts n=2 structured packing, in which structure A and structure B are respectively composed of 15 packing sheets, a total of 60 packing sheets. The catalyst is packed in packing sheets in structure A. The diameter of the tower is DN1000, the height of the plate is 140mm, and the upper and lower plates are rotated 90° for installation. Comparing the catalytic rectification filler of the present invention with the use of ordinary packaged catalysts, the experiment shows that the total pressure drop in the tower is reduced by 35%, and the chlorobenzene content in the final tower kettle is increased to 98%.

Embodiment 3

[0031] In the ethylene glycol monobutyl ether catalytic distillation equipment, ethylene glycol monobutyl ether is synthesized from ethylene oxide and n-butanol. The packing adopts window diversion packing and metal calendered orifice corrugated packing, and each layer adopts structured packing with n=4, among which structure A and structure B are respectively composed of 10 packing sheets, a total of 80 packing sheets. The catalyst is packed in packing sheets in structure A. The diameter of the tower is DN1200, the height of the plate is 170mm, and the upper and lower plates are rotated by 45° for installation. Comparing the catalytic rectification filler of the present invention with the use of common bundled catalysts, experiments show that the total pressure drop in the tower is reduced by 25%, and the final yield of ethylene glycol monobutyl ether is increased by 20%.

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Abstract

The invention relates to catalytic rectification packing with radial distribution capacity. The interior of a structure A consists of packing sheets; catalysts are filled in the packing, and the exterior is coated by a screen; a structure B refers to regular packing sheets and can be windowing guide packing, plate ripple packing, screen ripple packing, pore plate ripple packing, rolled pore plate ripple packing, cellular packing and other regular packing. The two structures are alternately and circumferentially distributed in a packing disc. The structure A and the structure B are circumferentially arranged in a staggered mode, so that the number of vapor-liquid multi-phase flow channels are increased, the mass transfer process of vapor-liquid multi-phase flow is facilitated, the phenomena of channeling and short circuit of vapor-liquid multi-phase flow are effectively avoided, small bed pressure drop is realized, a multi-phase flow radial diffusion effect is effectively enhanced, the reaction products are timely separated, and forward reaction is promoted, so that the amount of catalysts can be reduced.

Description

technical field [0001] The invention is a structural packing for multiphase flow separation or multiphase flow reaction, which can be widely used in catalytic rectification equipment (such as reactors, rectification towers, extraction reactions, etc.); and can effectively improve Fluid radial distribution effect, improve reaction and separation efficiency. Background technique [0002] Inside a catalytic distillation plant, the reaction and separation processes take place simultaneously. After the reactant reacts in the reaction zone equipped with the catalyst, the reaction product is separated in time in the separation zone, which promotes the reaction to continue, thus realizing the coupling of reaction and separation. Packing plays an important role in the catalytic distillation process, and its structure directly affects the efficiency of the reaction separation process. Therefore, the packing arrangement should not only ensure full contact between the vapor and liquid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/32B01D3/14B01J8/02
Inventor 徐义明黄益平陈英才陆晓咏岳昌海刘春江丁晖殿李敬楠项文雨
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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