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A kind of structured silica gel adsorption material and preparation method thereof

A technology of structured silica gel and adsorption materials, which is applied in chemical instruments and methods, inorganic chemistry, and other chemical processes, and can solve problems such as low overall strength of adsorption materials, low strength and hardness of matrix materials, and unsuitable distribution of silica gel layers. Achieve the effects of easy modular filling, long service life, and high surface activity channels

Active Publication Date: 2022-02-15
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method requires special processing of ceramic fiber sheets, and the strength and hardness of the base material used are low. The silica gel layer should not be evenly distributed on the surface of the fiber, which is likely to cause differences in adsorption, and the overall strength of the adsorption material is not high.

Method used

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  • A kind of structured silica gel adsorption material and preparation method thereof
  • A kind of structured silica gel adsorption material and preparation method thereof
  • A kind of structured silica gel adsorption material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: A kind of preparation method of structured silica gel adsorption material:

[0028] Soak a three-dimensional nickel foam sheet with a pore size of 0.1mm, a thickness of 0.6mm, and a porosity of 92% in a silane solution with a mass fraction of 2%, remove the residual liquid, dry it and cure it at 100°C for 1 hour, and dry the dried sample Then soak into the silica sol solution with a mass fraction of 20%, and pre-coat a layer of silica gel film. The program-controlled pulling machine was set at a pulling speed of 2 cm / min, a drying time of 15 min, and dip-coated 5 times to obtain a sample coated with water glass. After drying at room temperature for 15 minutes, soak it in a PAC solution with a heating temperature of 45°C and a mass fraction of 5%, take it out after 2 hours, rinse it with deionized water, and bake it at 120°C for 2 hours. Place in acetone solution and pass through an ultrasonic oscillator for 30 minutes, and the mass loss rate is 1.5%.

Embodiment 2

[0029] Embodiment 2: A kind of preparation method of structured silica gel adsorption material:

[0030] Soak a three-dimensional structure nickel foam sheet with a pore size of 0.5mm, a thickness of 2mm, and a porosity of 85% in a silane solution with a mass fraction of 5%, remove the residual liquid, dry it and cure it at 100°C for 2 hours, and dry the dried sample again. Immerse in a silica sol solution with a mass fraction of 30%, and pre-coat a layer of silica gel film. The program-controlled pulling machine was set at a pulling speed of 2 cm / min, a drying time of 15 min, and dip-coated 7 times to obtain a sample coated with water glass. After drying at room temperature for 30 minutes, soak it in a PAC solution with a heating temperature of 60°C and a mass fraction of 10%, take it out after 1 hour, rinse it with deionized water, and bake it at 100°C for 3 hours. Placed in acetone solution and subjected to an ultrasonic oscillator for 30 minutes, the mass loss rate was 0....

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Abstract

The invention discloses a structured silica gel adsorption material and a preparation method thereof. The preparation method comprises the following steps: (1) placing a three-dimensional structural nickel foam film in a silane solution, taking it out and curing it; (2) coating the surface with Nickel foam covered with silane is dipped in acidic silica sol to pre-coat a layer of silica sol, take it out and dry it; (3) pull and dip the treated foam nickel, the dipping solution is water glass, and dry after dipping Treatment; (4) immerse in polyaluminum chloride PAC solution with a concentration of 5-20% for 30-150 minutes, rinse with deionized water after taking out, dry in the air, and dry for activation. The invention adopts the in-situ reaction of the dip coating method to obtain the structured silica gel adsorption material. The adsorption material provides a channel with high surface activity, and the mass transfer rate is improved; it avoids the wear between particles of the traditional particle adsorption material under alternating pressure; it is conducive to the development of a more compact rapid adsorption device.

Description

technical field [0001] The invention belongs to the technical field of chemical adsorption materials, in particular to a structured silica gel adsorption material and a preparation method thereof. Background technique [0002] Silica gel is a hard amorphous chain and network structure material with rich pore structure, large pore volume and specific surface area, and is resistant to water, CO 2 , alcohol, benzene, ether, etc. have good adsorption, so it is widely used in the preparation of various gas adsorbents, chromatographic column packing and environmental purification functional materials. In industrial production, traditional silica gel is usually piled up in the adsorption tower in granular form. In this filling mode, when the cycle frequency of the adsorption device is greatly increased, the inventory of the adsorbent increases, which is not conducive to improving the adsorption efficiency. Under rapid alternating pressure, it will intensify the mutual friction be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30
CPCB01J20/0225B01J20/10B01J20/22B01J20/28054
Inventor 刘京雷王浩贺伯钧徐宏张胜中张英
Owner EAST CHINA UNIV OF SCI & TECH
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