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Hydrogenation reaction device in micropacked bed and method for hydrogenation reaction by using same

A technology for hydrogenation reaction and packed bed, applied in the field of chemical reaction, can solve the problems of small contact area of ​​liquid phase and catalyst, low catalytic hydrogenation efficiency, large reactor volume, etc., so as to reduce the amount of catalyst and avoid local excessive hydrogenation , the effect of high mass transfer efficiency

Active Publication Date: 2019-01-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of this type of method is that the contact area between the gas phase, liquid phase and catalyst in the reactor is small, the efficiency of catalytic hydrogenation is low, resulting in long residence time of materials in the reactor and large reactor volume.

Method used

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  • Hydrogenation reaction device in micropacked bed and method for hydrogenation reaction by using same

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Effect test

Embodiment 1

[0026] Carry out experiment according to this method, be made into the solution that mass fraction is 10% by dissolving α-methylstyrene in methanol, control reaction temperature is 20 ℃, and pressure is 0.5MPa, in membrane dispersing micro-mixer (membrane average pore size 5 Micron) in the first hydrogen dispersed in the methanol solution to form a gas-liquid mixture containing microbubbles (average diameter of 200 microns), then through the micro-packed bed of palladium / alumina catalyst (average diameter of 600 microns) (packed bed inner diameter / catalyst The diameter ratio is 10, the packed bed aspect ratio is 16), the control liquid residence time is 0.5min, and the gas-liquid phase separation is carried out at the outlet of the micro-packed bed, and the methanol solution obtained is analyzed, and the conversion rate of the reaction is 100%. The yield of benzene is above 99%.

Embodiment 2

[0028] Carry out experiment according to this method, be made into the solution that mass fraction is 1% by dissolving α-methylstyrene in methanol, control reaction temperature is 30 ℃, and pressure is 1MPa, in sieve hole dispersion micro-mixer (screen hole characteristic aperture 200 microns) in the first hydrogen dispersed in the methanol solution to form a gas-liquid mixture containing microbubbles (average diameter 400 microns), then through the micro-packed bed of palladium carbon catalyst (average diameter 100 microns) (packed bed inner diameter / catalyst diameter Ratio is 40, and packed bed length-to-diameter ratio is 4), and the control liquid residence time is 5s, and gas-liquid phase separation is carried out at the outlet of micro-packed bed, and the methanol solution that obtains is analyzed, and the conversion efficiency of reaction is 100%, the cumene The yield is above 99%.

Embodiment 3

[0030] Carry out experiment according to this method, be made into the solution that mass fraction is 40% in the methanol that α-methylstyrene is dissolved, control reaction temperature is 80 ℃, and pressure is 2MPa, in membrane dispersion micro-mixer (membrane average aperture 10 microns ) in the first hydrogen dispersed in the methanol solution to form a gas-liquid mixture containing microbubbles (average diameter of 100 microns), then through the micro-packed bed of palladium / alumina catalyst (average diameter of 200 microns) (packed bed inner diameter / catalyst diameter ratio is 20, the packed bed aspect ratio is 100), the control liquid residence time is 5min, and the gas-liquid phase separation is carried out at the outlet of the micro-packed bed, and the methanol solution obtained is analyzed, and the conversion rate of the reaction is 100%, the cumene The yield was 98.9%.

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Abstract

The invention discloses a hydrogenation reaction device in a micropacked bed and a method for a hydrogenation reaction by using the same in the technical field of chemical reaction engineering. The method comprises the steps: firstly, dispersing hydrogen into a solution containing a to-be-hydrogenated substrate by a micromixer to obtain a gas-liquid mixed fluid containing micro-scale bubbles; andthen, finishing a hydrogenation process on the gas-liquid mixed fluid by a micropacked bed filled with a hydrogenation catalyst. By using the method, the high mixing efficiency and excellent mass transfer and heat transfer performances of a microreactor are utilized, the gas-liquid and liquid-solid mass transfer in a hydrogenation reaction process is enhanced, the heat transfer capacity of the reactor is remarkably improved, and the size of a hydrogenation reactor can also be remarkably reduced; the hydrogenation reaction device has the advantages of high hydrogenation efficiency, safety, controllability and simplicity in amplification and can be widely applied to the technical fields such as petroleum and petrochemicals, fine chemical engineering, medicines, environments and foods.

Description

technical field [0001] The invention belongs to the technical field of chemical reaction, and in particular relates to a hydrogenation reaction device in a micro-packed bed and a hydrogenation reaction method thereof. Background technique [0002] Hydrogenation process widely exists in the fields of petroleum and petrochemical, fine chemical, pharmaceutical, environment and food. The batch hydrogenation process is usually completed by a hydrogenation tank. This method has the advantages of simple process and flexible operation. However, this method has problems such as cumbersome operation, frequent loading and unloading of catalysts, low reaction efficiency, large catalyst consumption, large reactor volume, and poor safety. At present, the use of large-scale hydrogenation tanks is strictly approved and controlled by the government. The hydrogenation process in the petroleum and petrochemical industry is usually a continuous process, using trickle bed, fluidized bed or slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02
CPCB01J8/02
Inventor 张吉松骆广生
Owner TSINGHUA UNIV
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