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A membrane that desorbs CO2 from an aqueous solution containing potassium bicarbonate and its preparation method

A technology of potassium bicarbonate and aqueous solution, which is applied in the field of CO2 desorption membrane and its preparation, can solve the problems of reducing desorption temperature, and achieve the effects of reducing desorption temperature, desorption energy consumption, and energy consumption

Active Publication Date: 2020-11-10
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN104607073 A proposes the combination of solvent absorption and membrane desorption, which can greatly reduce the desorption temperature and reduce the energy consumption of the desorption process; however, the membrane is suitable for 2 CO desorption from organic solution 2 , it is urgent to develop a membrane material suitable for aqueous solution

Method used

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  • A membrane that desorbs CO2 from an aqueous solution containing potassium bicarbonate and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] according to figure 1 Flowchart shown for the preparation of CO desorption from an aqueous solution containing potassium bicarbonate 2 membrane (catalytic desorption membrane).

[0023] Take dimethylsiloxane (PDMS) 11.5g, add solvent n-heptane 45g, add TiO 2 Nanomaterials (60nm) 0.35g, strongly dispersed evenly; add active crosslinking agent vinyltrimethoxysilane 1.8g, add catalyst dibutyltin dilaurate 0.5g, stir at 20°C for 2.5h; The base membrane is a polyacrylonitrile microfiltration membrane (pore size 20 microns), the thickness of the active layer is controlled to be 35 μm, and the film is formed by evaporation at room temperature.

[0024] Membrane performance test: CO desorption from 20% (wt) potassium bicarbonate aqueous solution 2 , the desorption temperature is 70°C, and the desorption rate of potassium bicarbonate is 40.2%.

Embodiment 2

[0026] according to figure 1 Flowchart shown for the preparation of CO desorption from an aqueous solution containing potassium bicarbonate 2 membrane.

[0027] Take PDMS 11.3g, add solvent n-hexane 50g, add SiO 2 Nanomaterials (50nm) 0.55g, strongly dispersed evenly; add active crosslinking agent ethyl silicate 1.5g, phenyltriethoxysilane 0.8g, add catalyst dibutyltin dilaurate 0.5g, stir at 25°C for 3.5 h: Use a membrane-making mechanism to make a membrane, the base membrane is a polydimethylsulfoxide microfiltration membrane (pore size 30 microns), control the thickness of the active layer to 15 μm, and evaporate to form a film at 30°C.

[0028] Membrane performance test: CO desorption from 25% (wt) potassium bicarbonate aqueous solution 2 , the desorption temperature is 75°C, and the desorption rate of potassium bicarbonate is 45.5%.

Embodiment 3

[0030] according to figure 1 Flowchart shown for the preparation of CO desorption from an aqueous solution containing potassium bicarbonate 2 membrane.

[0031] Take 12.5g of poly PDMS, add solvent n-hexane 50g, add TiO(OH) 2 Nanomaterials (60nm) 0.65g, strongly dispersed evenly; add active components ethyl silicate 1.5g, N-aminoethyl-3-aminopropyltrimethoxysilane 0.6g, polydopamine 1.1g, add catalyst dilaurel Dibutyltin dibutyltin 0.6g, stirred at 35°C for 4h; use a membrane mechanism to form a membrane, the base membrane is a polydimethylsulfoxide microfiltration membrane (pore size 30 μm), control the thickness of the active layer to 70μm, and evaporate to form a film at 50°C.

[0032] Membrane performance test: CO desorption from 25% (wt) potassium bicarbonate aqueous solution 2 , the desorption temperature is 80°C, and the desorption rate of potassium bicarbonate is 50.3%.

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Abstract

The invention discloses a membrane for desorbing CO2 from a water solution containing potassium bicarbonate, and a preparation method of the membrane, belonging to the technical field of pervaporationmembrane separation. The membrane consists of a base membrane and an active layer membrane, wherein the active layer membrane is prepared from polydimethylsiloxane, an active crosslinking agent and inorganic nano-material particles; the mass ratio of the active crosslinking agent to the polydimethylsiloxane is equal to 0.1-4; the mass ratio of the inorganic nano-material particles to the polydimethylsiloxane is equal to 0.005-0.1; the inorganic nano-material particles are one or more of nano SiO2, TiO2 and TiO(OH)2, and have particle sizes of 20-100 nm; the active layer membrane has a thickness of 10-70 mum. The preparation method comprises the following steps: adding the inorganic nano-material particles, the active crosslinking agent and a catalyst into a polydimethylsiloxane solution,and carrying out a crosslinking reaction to obtain a membrane solution; coating the base membrane with the membrane solution, and evaporating a solvent to form the membrane. The membrane is suitable for an aqueous solution system, realizes desorption of CO2 in the potassium hydrogencarbonate aqueous solution, and cools the desorption temperature to 70-90 DEG C.

Description

technical field [0001] The invention belongs to the technical field of pervaporation membrane separation, in particular to a method for desorbing CO from an aqueous solution containing potassium bicarbonate 2 film and its preparation method. Background technique [0002] Due to CO 2 The greenhouse effect caused by excessive emissions has attracted worldwide attention, and carbon emission reduction is urgent. CCS is an effective way to reduce carbon emission recognized in the world. Chemical absorption method is considered to be the most effective CO due to its fast absorption rate and high efficiency. 2 One of the capture methods. Compared with organic absorbents (such as alcohol amines), the hot potash method uses inorganic absorbent potassium carbonate, which has higher stability and less loss, and has received widespread attention. But potassium carbonate absorbs CO 2 The formed potassium bicarbonate is usually heated to desorb CO 2 After recycling, the energy consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D67/00C01B32/50
CPCB01D61/362B01D67/0079C01B32/50
Inventor 汤志刚郭栋丁灏娄渲明爱博李红伟贺志敏邢潇宋笑非沈怡君王翔迪
Owner TSINGHUA UNIV
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