Preparation method of silicon dioxide/NaA molecular sieve composite membrane

A technology of silica and molecular sieves, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, membrane technology, etc., can solve problems such as polycrystalline membranes are easily damaged and affect membrane separation performance

Pending Publication Date: 2021-11-12
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polycrystalline membrane supported on the ceramic support is relatively easy to damage, and the polycrystalline membrane will have defects during the preparation process, and these defects directly affect the separation performance of the membrane.

Method used

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  • Preparation method of silicon dioxide/NaA molecular sieve composite membrane
  • Preparation method of silicon dioxide/NaA molecular sieve composite membrane
  • Preparation method of silicon dioxide/NaA molecular sieve composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add Tween-80 into water, stir evenly to prepare a Tween-80 aqueous solution with a concentration of 1%. At room temperature, the tubular NaA molecular sieve membrane was immersed in Tween-80 aqueous solution and stirred slowly. After soaking for 1 h, the tubular NaA molecular sieve membrane was taken out, washed once with ethanol and water, and dried in a vacuum oven. Dissolve ethyl orthosilicate in ethanol, then add deionized water and ammonia water in sequence (volume ratio of ethyl orthosilicate: water: ammonia water: ethanol is 1:1:1:20 respectively) to form a mixed solution. The dried tubular NaA molecular sieve membrane was immersed in the mixed solution of ethyl orthosilicate, slowly stirred for 6 hours, then taken out, and washed twice with ethanol. Then put it into a vacuum oven for drying to obtain a silica-modified NaA molecular sieve membrane. The surface morphology of the modified NaA molecular sieve membrane is as follows: figure 2 As shown, with the u...

Embodiment 2

[0022] Add polyvinyl alcohol into water, stir evenly to prepare a 3% polyvinyl alcohol aqueous solution. At room temperature, the tubular NaA molecular sieve membrane was immersed in an aqueous solution of polyvinyl alcohol and stirred slowly. After soaking for 6 h, the tubular NaA molecular sieve membrane was taken out, washed once with ethanol and water, and dried in a vacuum oven. Dissolve ethyl orthosilicate in ethanol, then add deionized water and ammonia water in sequence (volume ratio of ethyl orthosilicate: water: ammonia water: ethanol is 1:3:3:50 respectively) to form a mixed solution. The dried tubular NaA molecular sieve membrane was immersed in the mixed solution of ethyl orthosilicate, slowly stirred for 12 hours, then taken out, and washed twice with ethanol. Then put it into a vacuum oven for drying to obtain a silica-modified NaA molecular sieve membrane. Test the separation performance of the modified NaA molecular sieve membrane: the operating temperature ...

Embodiment 3

[0024] The chitosan is added into water, stirred evenly to prepare a chitosan aqueous solution with a concentration of 5%. At room temperature, the tubular NaA molecular sieve membrane was immersed in chitosan aqueous solution and stirred slowly. After soaking for 12 hours, the tubular NaA molecular sieve membrane was taken out, washed once with ethanol and water, and dried in a vacuum oven. Dissolve ethyl orthosilicate in ethanol, then add deionized water and ammonia water in sequence (volume ratio of ethyl orthosilicate: water: ammonia water: ethanol is 1:3:5:50 respectively) to form a mixed solution. The dried tubular NaA molecular sieve membrane was immersed in the mixed solution of ethyl orthosilicate, slowly stirred for 24 hours, then taken out, and washed twice with ethanol. Then put it into a vacuum oven for drying to obtain a silica-modified NaA molecular sieve membrane. Test the separation performance of the modified NaA molecular sieve membrane: the operating temp...

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Abstract

The invention discloses a preparation method of a silicon dioxide / NaA molecular sieve composite membrane. The preparation method comprises the following steps: dipping a tubular NaA molecular sieve membrane in a nonionic surfactant aqueous solution at room temperature, slowly conducting stirring, taking out the tubular NaA molecular sieve membrane after dipping for at least 1 hour, then conducting washing with ethanol and water respectively, removing unstable attached residues, and then conducting vacuum drying; and immersing the dried tubular NaA molecular sieve membrane into a mixed solution prepared from tetraethoxysilane, ethanol, deionized water and ammonia water, slowly conducting stirring for at least 6 hours, taking out the stirred materials, conducting washing with ethanol, and carrying out vacuum drying to obtain the silicon dioxide modified NaA molecular sieve membrane. According to the preparation method disclosed by the invention, hydrophilic silicon dioxide particles grow on the surface of the NaA molecular sieve membrane in situ, and the prepared composite membrane is applied to ethanol dehydration and has an excellent separation effect on an ethanol / water system.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic membrane materials, and in particular relates to a preparation method of a silicon dioxide / NaA molecular sieve composite membrane. Background technique [0002] Membrane separation technology is an emerging separation and purification technology, which has the advantages of low energy consumption, less pollution, continuous separation process, mild operating conditions, easy scale-up, and easy coupling with other separation processes. According to different membrane materials, it can be divided into inorganic membrane and organic membrane. Compared with organic membrane, inorganic membrane has excellent chemical stability, thermal stability and mechanical strength. NaA molecular sieve has an eight-membered ring cubic pore structure (0.41nm), which is between the diameters of most organic molecules and water molecules, and has strong hydrophilicity, making NaA molecular sieve membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/02C07C29/78C07C31/08
Inventor 陈赞袁标吴巍罗超段翠佳严硕沈鹏
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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