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Membrane for desorbing CO2 from solution containing CO2 and preparation method of membrane

A technology of CO2 and solution, which is applied in the field of CO2 desorption membrane and its preparation, can solve the problems of large solvent loss, high energy consumption, unsuitable solvent recovery, etc., and achieve the effect of reducing absorbent loss and desorption energy consumption

Active Publication Date: 2015-05-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to CO 2 The global climate greenhouse effect caused by excessive emissions has aroused widespread concern in the world. Carbon emission reduction is urgent. CCS is considered to be an effective way. Among them, the solvent absorption method is a relatively mature process, but in the process of solvent regeneration, heating desorption and gas desorption High energy consumption, large solvent loss, and not suitable for recovery of solvents with low boiling points

Method used

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  • Membrane for desorbing CO2 from solution containing CO2 and preparation method of membrane

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Experimental program
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Effect test

Embodiment 1

[0021] according to figure 1 The flow chart shown is prepared for the preparation from CO containing 2 CO desorbed from the solution 2 Membrane: take PDMS12.3g, add solvent n-heptane 40g, stir evenly, add active component vinyltrimethoxysilane 2g, add catalyst dibutyltin dilaurate 0.5g, stir at 25°C for 3h, use Mechanism film, the base film is polyacrylonitrile, the thickness of the active layer is controlled to 30 μm, the film is evaporated, and the absorption and desorption system is methanol-CO 2 , the permeation flux of this membrane is 0.7kg / (h*m2), and the enrichment factor reaches 23.

Embodiment 2

[0023] according to figure 1 The flow chart shown is prepared for the preparation from CO containing 2 CO desorbed from the solution 2 Membrane: take PDMS12.3g, add solvent n-hexane 50g, stir well, add active components ethyl silicate 0.5g, phenyltriethoxysilane 1.8g, add catalyst dibutyltin dilaurate 0.6g, at 25 Stir at ℃ for 4 hours, use a film-making mechanism to make a film, the base film is polydimethylsulfoxide, control the thickness of the film layer to 15 μm, evaporate to form a film, and the absorption and desorption system is dimethyl carbonate-CO 2 , the permeation flux of this membrane is 0.8kg / (h*m2), and the enrichment factor reaches 35.

Embodiment 3

[0025] according to figure 1 The flow chart shown is prepared for the preparation from CO containing 2 CO desorbed from the solution 2 Membrane: take PDMS12.3g, add solvent n-hexane 50g, stir evenly, add active components ethyl silicate 0.5g, N-aminoethyl-3-aminopropyltrimethoxysilane 0.8g, polydopamine 2.1g Add 0.65g of dibutyltin dilaurate as a catalyst, stir for 4 hours at 25°C, use a film-making mechanism to make a film, the base film is polydimethylsulfoxide, control the thickness of the film layer to 70 μm, evaporate to form a film, and the absorption and desorption system is propylene carbonate -CO 2 , the permeation flux of this membrane is 0.78kg / (h*m2), and the enrichment factor reaches 50.

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Abstract

The invention belongs to the technical field of separation, and discloses a membrane for desorbing CO2 from a solution containing CO2 and a preparation method of the membrane. The membrane for desorbing CO2 from the solution containing CO2 comprises a base membrane and a polydimethylsiloxane membrane with an active group, wherein the active group is an ester group or an amino group; the thickness of the polydimethylsiloxane membrane is 10-70 microns. The preparation method comprises the following steps: mixing the polydimethylsiloxane and an active crosslinking agent, coating the mixture on the base membrane, and crosslinking and curing at a certain temperature to form the membrane. According to the membrane for desorbing CO2 from the solution containing CO2, the solution absorbing CO2 is one of methanol, acetone, polyethylene glycol dimethyl ether, propylene carbonate, dimethyl carbonate, diethyl carbonate and butyl succinate; the permeation flux of the membrane is up to 0.2-1.1 kg / (h*m2), and the enrichment factor is up to 23-50.

Description

technical field [0001] The invention belongs to the technical field of pervaporation membrane separation, in particular to a 2 CO desorbed from the solution 2 film and its preparation method. Background technique [0002] Due to CO 2 The global climate greenhouse effect caused by excessive emissions has aroused widespread concern in the world. Carbon emission reduction is urgent. CCS is considered to be an effective way. Among them, the solvent absorption method is a relatively mature process, but in the process of solvent regeneration, heating desorption and gas desorption High energy consumption, large solvent loss, and not suitable for recovery of solvents with lower boiling points. [0003] Membrane technology, as a kind of wide application, flexible and convenient operation, small footprint, low operating cost, easy maintenance, easy to scale up and many other advantages, is being widely used. In the patent "using dimethyl carbonate absorption and membrane desorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/70B01D67/00B01D61/36C01B31/20C01B32/50
Inventor 汤志刚费维扬陈建郭栋贺志敏李红伟赵志军
Owner TSINGHUA UNIV
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