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Preparation and use of nano porous silica gel adsorbent material

A technology of silica gel adsorption and pore size, which is applied in chemical instruments and methods, silicon compounds, and other chemical processes, can solve the problems of unstable performance of silica gel core, corrosion of surrounding metal equipment, and decrease of silica gel specific surface area, etc., to achieve material saving Significant energy saving effect, heat saving, fast adsorption/desorption effect

Inactive Publication Date: 2003-06-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In the adsorption gas purification technology, the adsorption working fluid is the key to determine the performance of the adsorption system. There are more than a hundred kinds of adsorption working fluids and their combinations that have been developed, but they are selected based on the practicability of the adsorbent. The adsorbent in the dehumidifier is limited to highly hygroscopic substances such as lithium chloride, silica gel and molecular sieve; lithium chloride has good hygroscopicity and low regeneration temperature, but it is corrosive to surrounding metal equipment; molecular sieve is suitable for deep dehumidification with low dew point, but The regeneration temperature is high (above 250°C); the performance of silica gel is between the two, which is suitable for both conventional dehumidification (coarse pore silica gel) and low dew point deep dehumidification (fine pore silica gel), among which fine pore silica gel is suitable for making silica gel Dehumidification core, and the key to making silica gel dehumidification core is the organic combination of silica gel and inorganic fiber substrate; it can be made by bonding silica gel powder on inorganic fiber substrate with adhesive, but due to the powder and substrate The interface force between the two materials is weak, and the adhesion is poor. Repeated use at higher temperatures (above 150 ° C) is prone to powder falling, making the performance of the silica gel rotor unstable. At the same time, the use of adhesives will Partially block the substrate and silica gel channels, reducing the specific surface area of ​​silica gel, thereby reducing the adsorption efficiency; it is also possible to use conventional silica gel preparation methods on inorganic fiber substrates to allow water glass to react with acid, but it is difficult to form due to the constraints of sol stability. High-concentration sol, coupled with the fact that the inorganic fiber is insoluble in water, the contact surface between the sol and the fiber is small, so the amount of sol attached to the inorganic fiber is small, the silica gel produced is less, and the dehumidification efficiency is low

Method used

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  • Preparation and use of nano porous silica gel adsorbent material
  • Preparation and use of nano porous silica gel adsorbent material
  • Preparation and use of nano porous silica gel adsorbent material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) At room temperature, in a 200L round plastic container, add 120L of water, then add 40Kg of water glass with a modulus of 3.0, stir evenly, and put the formed honeycomb core made of inorganic fiber paper (500mm× 200mm) into it for 12 hours to fully infiltrate it, take it out to dry, then dry at 60°C for 18 hours at low temperature, and cool to room temperature; (2) Weigh 25Kg of anhydrous calcium chloride and dissolve it in 125L of water, Immerse the above-mentioned honeycomb core in it, react for 12 hours, take it out and dry it in the air, then place it in an oven to dry at 60°C for 24 hours, and cool to room temperature; (3) measure 10L of industrial concentrated hydrochloric acid and dilute it to 160L, Immerse the rotating core in it, take it out after 20 hours and rinse it with water until the pH is neutral, dry it in a 40°C constant temperature drying oven for 24 hours, then place the rotating core in an intelligent constant temperature sintering furnace, and ...

Embodiment 2

[0024] (1) At room temperature, in a 200L round plastic container, add 100L of water, then add 40Kg of water glass with a modulus of 3.0, stir evenly, and put the formed honeycomb core made of inorganic fiber paper (500mm× 200mm) into it for 12 hours to fully infiltrate it, take it out and dry it in the air, then dry it at a low temperature at 60°C for 18 hours, and cool to room temperature; (2) Weigh 30Kg of anhydrous calcium chloride and dissolve it in 120L of water, and The above-mentioned honeycomb core was immersed in it, and after 12 hours of reaction, it was taken out to dry, and then placed in an oven to dry at 60°C for 24 hours, and cooled to room temperature; (3) Measure 10L of industrial concentrated hydrochloric acid and dilute it to 160L, and the Immerse the core in it, take it out after 20 hours, wash it with water until the pH is neutral, dry it in a constant temperature drying oven at 40°C for 24 hours, then place the core in an intelligent constant temperature...

Embodiment 3

[0026] (1) At room temperature, in a 200L circular plastic container, add 120L of water, then add 30Kg of water glass with a modulus of 3.0, stir evenly, and put the formed honeycomb core made of inorganic fiber paper (500mm× 200mm) into it for 12 hours to fully infiltrate it, take it out and dry it in the air, then dry it at 60°C for 18 hours, and cool to room temperature; (2) Weigh 20Kg of anhydrous calcium chloride and dissolve it in 140L of water, and dissolve the above Immerse the honeycomb rotor core in it, take it out after 12 hours to dry it, then place it in an oven to dry at 60°C for 24 hours, and cool to room temperature; (3) Measure 9L of industrial concentrated hydrochloric acid and dilute it to 160L, and immerse the honeycomb rotor core Among them, take it out after 20 hours and wash it with water until the pH is neutral, dry it in a 40°C constant temperature drying oven for 24 hours, then place the rotor in an intelligent constant temperature sintering furnace, ...

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Abstract

A silica gel absorbent with nano pores is prepared through immersing inorganic fibrous paper in water glass for 10-24 hr, drying for 10-24 hr, immersing in aquous solution of precipitant for 12-24 hr, drying in air, immersing in acid for 12-24 hr, water washing until it become neutral, drying in air, and program heating. It can be used as demoistening core of air conditioner. Its advantages are high adsorptive power, and low energy consumption and regenerating temp.

Description

technical field [0001] The invention relates to adsorption gas purification technology, in particular to a preparation method and application of a nano-pore silica gel adsorbent material. Background technique [0002] Adsorption gas purification technology has obvious advantages in low-grade energy utilization and environmental protection, and has become one of the sustainable development technologies. In the adsorption gas purification technology, the adsorption working fluid is the key to determine the performance of the adsorption system. There are more than a hundred kinds of adsorption working fluids and their combinations that have been developed, but they are selected based on the practicability of the adsorbent. The adsorbent in the dehumidifier is limited to highly hygroscopic substances such as lithium chloride, silica gel and molecular sieve; lithium chloride has good hygroscopicity and low regeneration temperature, but it is corrosive to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30
Inventor 方玉堂丁静杨晓西范娟杨建平
Owner SOUTH CHINA UNIV OF TECH
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