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High-adsorbability porous silicon dioxide absorbing agent and preparation method and application thereof

A porous silica, high adsorption technology, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of low dehumidification capacity, small dehumidification capacity, high regeneration temperature, etc., and achieve high adsorption/desorption rate , Large adsorption capacity, high adsorption capacity effect

Inactive Publication Date: 2011-02-02
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The primary purpose of the present invention is to overcome the shortcomings of existing adsorbent materials such as high regeneration temperature, small dehumidification capacity and low dehumidification capacity in the low humidity range, and provide a high adsorption capacity with high desorption performance at low regeneration temperature. Preparation method of porous silica adsorbent

Method used

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  • High-adsorbability porous silicon dioxide absorbing agent and preparation method and application thereof
  • High-adsorbability porous silicon dioxide absorbing agent and preparation method and application thereof
  • High-adsorbability porous silicon dioxide absorbing agent and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] (1) 3g polyvinylpyrrolidone (PVP) was dissolved in 87g water, and 15g concentrated hydrochloric acid (37% by mass) was added to adjust the acidity of the solution to obtain a water / acid / PVP solution;

[0034] (2) Add 3g tetraethyl orthosilicate (TEOS) dropwise to the water / acid / PVP solution, stir at 35°C for 24 hours to obtain a sol, gelatinize at 80°C for 48 hours, dry at 95°C for 24 hours, and bake The dried sample was calcined at a temperature of 500° C. for 3 hours with a heating rate of 0.5° C. / min to obtain a highly adsorbable porous silica adsorbent. N 2 - Determination of its specific surface area and pore size distribution by adsorption and desorption, the determination uses a common N 2 -Adsorption-desorption instrument, the adsorbent was vacuum treated at 200°C for 10 hours before measurement; 2 -BET specific surface area and BJH pore size distribution are calculated by the built-in software of the adsorption-desorption instrument. The porous structure was...

Embodiment 2

[0037] (1) 1g of polyvinylpyrrolidone (PVP) was dissolved in 84g of water, and 10g of concentrated hydrochloric acid (37% by mass) was added to adjust the acidity of the solution to obtain a water / acid / PVP solution;

[0038] (2) Add 6g of orthomethyl silicate (TMOS) dropwise to the water / acid / PVP solution, stir at 35°C for 24 hours to obtain a sol, gel at 75°C for 56 hours, dry at 85°C, and dry The sample was calcined at 550°C for 3 hours with a heating rate of 0.5°C / min to obtain a highly adsorbable porous silica adsorbent. Specific surface area, pore size distribution, pore structure observation, adsorption capacity and adsorption / desorption rate determination methods are the same as in Example 1.

[0039] (3) The above-mentioned sol is impregnated on the ceramic rotor, gelled at 75°C for 56 hours, dried at 85°C, programmed to heat up to 550°C for 3 hours, and the heating rate is 0.5°C / min to make solid porous carbon dioxide. Silicon dehumidification wheel core.

Embodiment 3

[0041] (1) 4g polyvinylpyrrolidone (PVP) was dissolved in 76g water, and 20g concentrated hydrochloric acid (37% by mass) was added to adjust the acidity of the solution to obtain a water / acid / PVP solution;

[0042] (2) Add 8g tetraethyl orthosilicate (TEOS) dropwise to the water / acid / PVP solution, stir at 35°C for 20 hours to obtain a sol, gelatinize at 80°C for 48 hours, dry at 100°C, and dry The sample was calcined at 500°C for 4 hours with a heating rate of 0.5°C / min to obtain a highly adsorbable porous silica adsorbent. Specific surface area, pore size distribution, pore structure observation, adsorption capacity and adsorption / desorption rate determination methods are the same as in Example 1.

[0043] (3) The above-mentioned sol is impregnated on the ceramic rotor, gelled at 80°C for 48 hours, dried at 100°C, programmed to heat up to 500°C for 4 hours, and the heating rate is 0.5°C / min to make solid porous carbon dioxide. Silicon dehumidification wheel core.

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Abstract

The invention discloses a high-adsorbability porous silicon dioxide absorbing agent and a preparation method and application thereof. The preparation method comprises the steps of: dissolving polyvinylpyrrolidone into water, adding acid to obtain a water / acid / polyvinylpyrrolidone solution; and adding silanol salt to obtain gel, gelating, drying and roasting to obtain the high-adsorbability porous silicon dioxide absorbing agent. The surface area of the high-adsorbability porous silicon dioxide absorbing agent is more than 300m<2>.g<-1>, the water absorbing quantity can reach 60 percent when the relative humidity is 95 percent, and the pore diameter is 3-8nm between gross porous silicon gel and thin porous silicon gel. The high-adsorbability porous silicon dioxide absorbing agent has higher absorbing quantity compared with the thin porous silicon gel, stronger capillary condensation capability compared with the gross porous silicon gel, and higher absorbing quantity and absorbing / desorption rate; and the regeneration temperature is 85-90 DEG C, thus the requirement on equipment size and energy is reduced, and the energy and material saving effect is remarkable. The absorbing agent is suitable for preparing a rotary absorber in the field of gas drying and purification.

Description

technical field [0001] The invention belongs to adsorption gas drying and purification technology, in particular to a high-adsorption porous silicon dioxide adsorbent and its preparation method and application. Background technique [0002] Adsorption gas drying and purification technology has become one of the sustainable development technologies because of its remarkable advantages in low-grade energy utilization and environmental protection. In the adsorption gas drying and purification technology, the adsorbent is the key to determine the performance of the adsorption device. Adsorbers can be divided into fixed bed adsorbers and rotary adsorbers according to their types. The adsorbent materials used in fixed bed adsorbers are mainly porous media, such as silica gel, aluminum glue, molecular sieve, etc., but silica gel and aluminum glue have low crushing strength, and are easy to burst and break when exposed to water, which will increase the pressure drop of the drying t...

Claims

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Application Information

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IPC IPC(8): B01D53/06B01D53/28C01B33/12B01J20/10
Inventor 魏小兰丁静杨建平彭舒军杨晓西蒋赣
Owner SOUTH CHINA UNIV OF TECH
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