CN-121972138-A - Hydrophobic flat plate type low-temperature solid adsorption material and preparation method thereof

CN121972138ACN 121972138 ACN121972138 ACN 121972138ACN-121972138-A

Abstract

The embodiment of the disclosure provides a hydrophobic flat plate type low-temperature solid adsorption material and a preparation method thereof, wherein the preparation method comprises the steps of weighing a first preset mass of potassium carbonate, adding the first preset mass of potassium carbonate into deionized water, and completely dissolving the potassium carbonate to obtain a saturated aqueous solution of potassium carbonate; sequentially adding a second preset mass of aggregate carrier, a third preset mass of alkaline alumina sol and a fourth preset mass of polytetrafluoroethylene pellets into the saturated aqueous solution of potassium carbonate to form a flowable pug, uniformly paving the pug on the surface of a metal net, pressing under preset pressure to form a flat blank, drying to ensure that the flat blank is constant in mass, and calcining and solidifying the flat blank with constant mass to obtain the hydrophobic flat low-temperature solid adsorption material. The device has high CO 2 adsorption capacity, excellent hydrophobicity and mechanical stability, and the low-temperature applicability can obviously reduce the energy consumption of industrial carbon capture, and the flat plate type design is adapted to a modularized device.

Inventors

ZHU YUHUI
LI QIUNAN
ZHOU JIALIANG
YANG GANG
WANG SIYUAN
WU XUN
LEI SIYUAN
Cheng Huanyang
CHEN BAOKANG
TANG RONGFU
ZHAO LIJUAN
KONG XIANGZHEN

Assignees

华能重庆珞璜发电有限责任公司
西安热工研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20260129

Claims (9)

1. The preparation method of the hydrophobic flat plate type low-temperature solid adsorption material is characterized by comprising the following steps of: weighing a first preset mass of potassium carbonate, and adding the potassium carbonate into deionized water to completely dissolve the potassium carbonate to obtain a saturated aqueous solution of potassium carbonate; Sequentially adding the aggregate carrier with the second preset mass, the alkaline alumina sol with the third preset mass and the polytetrafluoroethylene pellets with the fourth preset mass into the saturated aqueous solution of potassium carbonate, and continuously stirring at the first preset temperature until all the components are uniformly mixed to form a mud material with fluidity; Uniformly paving the pug on the surface of a metal net, and pressing under preset pressure to form a flat blank; drying the flat blank at a low temperature at a second preset temperature and then at a high temperature at a third preset temperature until the quality of the flat blank is constant; and calcining and solidifying the flat blank with constant mass to obtain the hydrophobic flat low-temperature solid adsorption material.
2. The method for preparing the hydrophobic flat-plate type low-temperature solid adsorption material according to claim 1, wherein the mass ratio of the first preset mass to the second preset mass is 1:1-1.2, the mass ratio of the first preset mass to the third preset mass is 1:0.05-0.1, and the mass ratio of the first preset mass to the fourth preset mass is 1:0.1-0.2.
3. The method for preparing a hydrophobic flat plate type low-temperature solid adsorption material according to claim 2, wherein the aggregate carrier is alumina or titanium oxide, and the particle size of the polytetrafluoroethylene pellets is 200 microns.
4. The method for preparing the hydrophobic flat plate type low-temperature solid adsorption material according to any one of claims 1 to 3, wherein the step of continuously stirring at the first preset temperature until the components are uniformly mixed, and the step of forming the slurry with fluidity comprises continuously stirring at the temperature of 25-35 ℃ for 30-60 min so as to fully and uniformly mix the components to form the slurry with proper fluidity.
5. The method for preparing a hydrophobic flat plate type low-temperature solid adsorption material according to any one of claims 1 to 3, wherein the pressing under a preset pressure comprises pressing under a pressure of 5-10 mpa for 3 min-5 min by a tablet press to tightly combine the pug with the metal mesh.
6. The method for preparing a hydrophobic flat plate type low-temperature solid adsorption material according to claim 5, wherein the metal mesh is a stainless steel metal mesh with a pore diameter of 50-100 microns.
7. The method for preparing the hydrophobic flat-plate type low-temperature solid adsorption material according to any one of claims 1 to 3, wherein the step of drying the flat-plate blank at a second preset temperature at a low temperature and then at a third preset temperature at a high temperature comprises the steps of placing the flat-plate blank in a drying box, drying the flat-plate blank at a low temperature of 60-80 ℃ for 2-4 hours, and heating the flat-plate blank to 100-120 ℃ for 4-6 hours.
8. The method for preparing the hydrophobic flat-plate type low-temperature solid adsorption material according to any one of claims 1 to 3, wherein the calcining and solidifying the flat-plate blank with constant mass comprises the steps of placing the flat-plate blank with constant mass into a muffle furnace, heating to 300-400 ℃ at a heating rate of 5-10 ℃ per min, preserving heat for 2-3 hours, and then naturally cooling to room temperature.
9. A hydrophobic flat-plate type low-temperature solid adsorption material, which is characterized in that the hydrophobic flat-plate type low-temperature solid adsorption material is prepared by the preparation method of any one of claims 1 to 8.

Description

Hydrophobic flat plate type low-temperature solid adsorption material and preparation method thereof Technical Field The embodiment of the disclosure belongs to the technical field of CO 2 trapping materials, and particularly relates to a hydrophobic flat plate type low-temperature solid adsorption material and a preparation method thereof. Background The continuous increase of global energy demand causes massive combustion of fossil fuels, so that the concentration of CO 2 in the atmosphere is continuously increased, a series of environmental problems such as global warming, sea level rising and the like are aggravated, and serious threat is formed to the development of an ecological system and a human society. In order to achieve the aim of double carbon, the technology of trapping, utilizing and storing (CCUS) of CO 2 becomes a key path for reducing carbon emission, wherein the adsorption method is regarded as a CO 2 trapping technology with great application prospect because of the advantages of wide operating temperature range, small equipment corrosiveness, small waste emission and the like. Flue gas in industries such as thermal power, steel, chemical industry and the like is a main emission source of CO 2, and the flue gas generally has the characteristics of high humidity, complex components and the like, and strict requirements are put on the performance of the adsorption material. The low-temperature solid adsorbent is widely focused in industrial flue gas carbon capture due to mild operation conditions and low energy consumption, but the current low-temperature solid adsorbent material still has a plurality of technical bottlenecks, namely, firstly, a plurality of adsorbents are strong in hydrophilicity, water molecules and CO 2 are easy to compete for adsorption active sites in a high-humidity flue gas environment, meanwhile, the internal pores of the adsorbents are possibly blocked, the adsorption capacity and selectivity of CO 2 are obviously reduced, secondly, although the potassium-based adsorbent has the advantages of high carbonation reaction activity, difficult inactivation and the like, the traditional potassium-based adsorbent is mainly granular, the problems of high bed resistance, low mass transfer efficiency and the like exist, the forming performance is poor, the modularization and large-scale equipment requirements of industrial flue gas treatment are difficult to adapt, thirdly, the carrier and active substance of the current adsorbent material are insufficient in combination stability, the problems of active ingredient loss, structural collapse and the like are easy to occur in the process of repeated adsorption-regeneration cycles, and the service life and the industrial application economy of the material are influenced. In order to solve the problems, the development of a low-temperature solid adsorption material which has excellent hydrophobic performance, high-efficiency adsorption capacity and good mechanical stability and is suitable for industrial devices becomes a current research hot spot. The flat plate type adsorption material gradually becomes the preferred form in the field of industrial adsorption due to the advantages of large specific surface area, good gas circulation, convenient modularized installation and the like, but the existing flat plate type adsorption material has the problems of complex process, high cost, difficult balance of hydrophobic modification and adsorption activity and the like. Disclosure of Invention Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a hydrophobic flat plate type low-temperature solid adsorption material and a preparation method thereof. In one aspect, embodiments of the present disclosure provide a method for preparing a hydrophobic flat plate type low temperature solid adsorption material, the method comprising: weighing a first preset mass of potassium carbonate, and adding the potassium carbonate into deionized water to completely dissolve the potassium carbonate to obtain a saturated aqueous solution of potassium carbonate; Sequentially adding the aggregate carrier with the second preset mass, the alkaline alumina sol with the third preset mass and the polytetrafluoroethylene pellets with the fourth preset mass into the saturated aqueous solution of potassium carbonate, and continuously stirring at the first preset temperature until all the components are uniformly mixed to form a mud material with fluidity; Uniformly paving the pug on the surface of a metal net, and pressing under preset pressure to form a flat blank; drying the flat blank at a low temperature at a second preset temperature and then at a high temperature at a third preset temperature until the quality of the flat blank is constant; and calcining and solidifying the flat blank with constant mass to obtain the hydrophobic flat low-temperature solid adsorption material. Optio