Device and method for carrying out gas-liquid-solid reaction by using micro-foam packed bed

A foam filling, gas-liquid-solid technology, applied in chemical instruments and methods, chemical/physical processes, etc., can solve the problems of increasing the risk of the reaction process, low mass and heat transfer efficiency, low reaction rate and conversion rate, etc., to achieve Improve the gas-liquid-solid reaction speed, reduce the volume of the reactor, and be easy to replace and recycle.

Active Publication Date: 2020-04-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Gas-liquid-solid reactions generally rely on traditional multiphase reactors such as stirred tanks, bubble columns, and trickle beds, and these reactors often have low interface area, low mass and heat transfer efficiency, and potential safety issues
For example, mass transfer limitations between multiphase fluids in conventional stirred tank reactors will lead to lower reaction rates and conversions in catalytic hydrogenation processes
At the same time, in order to ensure the reaction effect, the common gas-liquid-solid reaction such as hydrogenation reaction process, the sys

Method used

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  • Device and method for carrying out gas-liquid-solid reaction by using micro-foam packed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to this method, the gas feed is hydrogen, the liquid feed is alpha-methylstyrene methanol solution (mass concentration 18%), the reaction temperature is 90℃, the back pressure is 1.2MPa, and the gas and liquid are loaded with micro The reaction was carried out on a packed bed of nickel foam supported palladium catalyst. The pore size of the microfoam was 200μm, the porosity was 0.98, the ratio of the inner diameter of the microfoam packed bed to the average pore size of the overall catalyst was 15, and the length-to-diameter ratio of the microfoam packed bed was 33. The ratio of the volume of the foam carrier to the volume of the packed bed is in the range of 1, and the residence time of the reactants in the packed bed is 22s. The alpha-methylstyrene methanol solution is separated by a phase separator and the liquid is analyzed and detected, and the conversion rate of alpha-methylstyrene is 99.9%.

Embodiment 2

[0029] According to this method for experiments, the gas feed is hydrogen, the liquid feed is alpha-methylstyrene ethanol solution (mass concentration 40%), the reaction temperature is 120℃, the back pressure is 1MPa, and the gas and liquid are loaded with micropores. The reaction is carried out on a packed bed of foamed copper-palladium catalyst. The pore size of the microfoam is 50μm, the porosity is 0.98, the ratio of the inner diameter of the microfoam packed bed to the average pore size of the overall catalyst is 10, the length to diameter ratio of the microfoam packed bed is 4, and the microfoam The ratio of the volume of the carrier to the volume of the packed bed is in the range of 1, and the residence time of the reactants in the packed bed is 10s. The alpha-methylstyrene ethanol solution is separated by a phase separator and then tested, and the conversion rate of alpha-methylstyrene is 95%.

Embodiment 3

[0031] According to this method, the gas feed is oxygen, the liquid feed is benzyl alcohol toluene solution (mass concentration 10%), the reaction temperature is 200℃, the back pressure is 0.2Mpa, the gas and liquid are loaded with microporous alumina ceramics The reaction is carried out in a packed bed of palladium catalyst. The pore size of the microporous alumina ceramic is 300μm, the porosity is 0.6, the ratio of the inner diameter of the microfoam packed bed to the average pore size of the overall catalyst is 33, the length to diameter ratio of the microfoam packed bed is 100, and the microfoam The ratio of the volume of the carrier to the volume of the packed bed is in the range of 0.25, and the residence time of the reactants in the packed bed is 30 minutes. The toluene solution of benzyl alcohol was separated by a phase separator for detection, and the conversion rate of benzyl alcohol was calculated to be 96%.

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Abstract

The gas-liquid-solid reaction simultaneously relates to three phase states of gas, liquid and solid, and plays a huge role in the fields of fine chemical engineering, pharmaceutical process, wastewater treatment and the like. Gas-liquid-solid reaction generally depends on a stirring kettle, a bubbling tower, a trickle bed and other traditional multiphase reactors, and the reactors often have the problems of low interface area, poor mass and heat transfer efficiency and the like. The invention provides a device and method for carrying out gas-liquid-solid reaction by using a micro-foam packed bed. As the micro-foam packed bed has the advantages of micron-sized characteristic size, high porosity, small pressure drop and the like, the micro-foam packed bed has the advantages of high mixing efficiency, high reaction speed, quick heat transfer, easiness in catalyst replacement and the like when being used for gas-liquid-solid reaction, and can be widely applied to the fields of fine chemical engineering, medicines, environments and the like.

Description

Technical field [0001] The invention belongs to the technical field of reactors used in gas-liquid-solid catalytic processes in the chemical industry. More specifically, the invention relates to a device and method for gas-liquid-solid reactions using micro-foam packed beds. Background technique [0002] Gas-liquid-solid reaction is a reaction process in which three different phases of gas, liquid and solid exist simultaneously. At present, gas-liquid-solid reaction plays a huge role in the fields of fine chemicals, pharmaceutical processes and wastewater treatment. Gas-liquid-solid reactions generally rely on traditional multiphase reactors such as stirred tanks, bubble towers and trickle beds. These reactors often have low interface area, low mass and heat transfer efficiency, and potential safety problems. For example, the mass transfer limitation between multiphase fluids in a traditional stirred tank reactor will result in a lower reaction rate and conversion rate in the ca...

Claims

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Application Information

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IPC IPC(8): B01J8/02
CPCB01J8/0292
Inventor 张吉松桑乐屠佳成
Owner TSINGHUA UNIV
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