Solid amine adsorbent, preparation method thereof, and CO2 adsorption assembly containing same

A technology of adsorbent and solid amine, which is applied in the field of gas purification, can solve the problems of reducing the porosity of macroporous materials, low density of carbon nanotubes, and affecting the adsorption rate. Effect

Active Publication Date: 2019-01-11
TIANJIN POLYTECHNIC UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditionally, porous materials for preparing solid amines mainly include mesoporous silicon, zeolite molecular sieves, and activated carbon. These porous materials are not only the "skeleton" of solid amine adsorbents, but also provide CO 2 The interface of the adsorption reaction, therefore, puts forward strict requirements on the structure of porous materials, not only a large amino loading capacity, but also a high specific surface area is required to improve the CO 2 Removal speed, CN102343254A discloses a normal temperature CO2 solid amine adsorbent and its preparation method, which is carbon nanotubes modified by liquid organic amines, wherein the weight percentage of carbon nanotubes is 50-70%, and the content of organic amines The weight percentage is 30-50%, which can absorb CO at room temperature 2 , and the energy consumption is small, but the density of carbon nanotubes is small, and the volume is too large when applied, so that its application is limited; CN105195113A discloses a method for capturing low-concentration CO at room temperature 2 A solid amine adsorbent and its preparation method and application, the adsorbent is dissolved in an organic solvent through a liquid organic amine and a surfactant, added a macroporous adsorption resin and reacted on a rotator for a period of time, so that the organic amine and the surfactant are impregnated into the pore structure of the resin carrier, and then remove the solvent to obtain a solid amine adsorbent. Although the energy consumption is low and the regeneration conditions are mild, when the organic amine load is too large, the porosity of the macroporous material will be reduced, thereby affecting CO 2 adsorption rate and lead to poor adsorption efficiency

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  • Solid amine adsorbent, preparation method thereof, and CO2 adsorption assembly containing same
  • Solid amine adsorbent, preparation method thereof, and CO2 adsorption assembly containing same
  • Solid amine adsorbent, preparation method thereof, and CO2 adsorption assembly containing same

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Embodiment 1

[0051] a CO 2 Adsorption components, the preparation method is as follows:

[0052] (1) Preparation of polysulfone (PSF) hollow fiber: PSF, N-methyl-2-pyrrolidone (NMP), and diethylene glycol (DEG) are PSF:NMP:DEG=1:4 in weight ratio : The ratio of 1.25 is fully stirred to obtain a uniform and stable solution. The solution was degassed in a 0.2MPa vacuum box for 1h, and then moved to the spinning equipment tank. Under the nitrogen pressure of 0.3MPa, the mixed solution of 99% NMP and 1% ethanol was used as the core fluid, deionized water was used as the external coagulant, and the air gap was 2cm for spinning. After fully curing, PSF hollow fibers were obtained.

[0053] (2) Prepare an ethanol solution containing 25% tetraethylenepentamine (TEPA) in mass percentage concentration, immerse three 15cm-long hollow fibers in the solution and keep at room temperature for 5 hours, then dry the ethanol with hot air at 50°C for 1 hour to obtain Solid amine adsorbent;

[0054] (3) T...

Embodiment 2

[0057] The only difference with embodiment 1 is that in this embodiment, step (1) and step (2) are as follows:

[0058] (1) Preparation of yttrium-stabilized zirconia (YSZ) hollow fiber: fully stir PSF, NMP, and YSZ at a weight ratio of PSF:NMP:YSZ=1:4:5.2 to obtain a uniform and stable solution. The solution was degassed in a 0.2MPa vacuum box for 1h, and then moved to the spinning equipment tank. Under 0.3MPa nitrogen pressure, use a mixed solution of 99% NMP and 1% ethanol as the core liquid, and use deionized water as the external coagulant for spinning. After fully solidified, the YSZ hollow fiber precursor is obtained. Sintered for 4h to get YSZ hollow fiber.

[0059] (2) Prepare an ethanol solution containing 20% ​​tetraethylenepentamine (TEPA) in mass percent concentration, immerse three 15 cm long hollow fibers in the solution and keep at room temperature for 5 hours, then dry the ethanol with hot air at 40° C. for 2 hours to obtain Solid amine adsorbent.

Embodiment 3

[0061] The only difference with embodiment 1 is that in this embodiment, step (1) and step (2) are as follows:

[0062] (1) Preparation of alumina (Al 2 o 3 ) Hollow fiber: PSF, NMP, Al 2 o 3 PSF:NMP:Al by weight ratio 2 o 3 = The ratio of 1:4:4.6 is fully stirred to obtain a uniform and stable solution. The solution was degassed in a 0.2MPa vacuum box for 1h, and then moved to the spinning equipment tank. Under 0.3MPa nitrogen pressure, use a mixed solution of 99% NMP and 1% ethanol as the core fluid, and use deionized water as the external coagulant. After fully curing, Al 2 o 3 Hollow fiber precursor, the precursor was sintered at 1400°C for 4 hours to obtain Al 2 o 3 hollow fiber.

[0063] (2) Prepare a methanol solution containing 30% by mass of γ-aminopropyltriethoxysilane (APTS), immerse three 15cm-long hollow fibers in the solution and keep it at room temperature for 5 hours, dry it with hot air at 60°C for 2 hours to remove methanol, A solid amine adsorbent...

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Abstract

The invention provides a solid amine adsorbent, a preparation method thereof, and a CO2 adsorption assembly containing the same. The solid amine adsorbent comprises hollow fibers and an organic aminesupported on the inner surface of the hollow fibers. The hollow fibers have a conveniently-adjusted pore structure, and can accommodate introduction groups with different structures and different molecular sizes to make the selection range of the organic amine wide; and a regular finger-like structure in the finger-like porous layer of the hollow fibers makes the organic amine uniformly distributed in pores to form an organic amine film, so the surface area of a CO2 adsorption reaction is greatly improved, and the removal rate of CO2 is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a solid amine adsorbent, a preparation method thereof and a CO2 containing it. 2 Snap components. Background technique [0002] In confined space environments such as manned space stations, submarines, and deep submersibles, CO removal 2 It is a necessary link to maintain the normal operation of the system. At the same time, complex working conditions require the removal of CO 2 The technology must not only be efficient, safe, and stable, but also small in size, light in weight, low in energy consumption, reproducible, and easy to operate and maintain. Currently, CO in confined spaces 2 Removal technologies mainly include: metal compound absorption method, molecular sieve adsorption method, amine absorption method, membrane separation method, etc.; metal compound absorption method represented by lithium hydroxide and super / peroxide absorption technology is mature, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/22Y02C20/40
Inventor 谭小耀张烨朱泓菡王晨盛俊峰陈宗蓬顾修筑谢东红
Owner TIANJIN POLYTECHNIC UNIV
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