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A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier

A porous carrier and defect-free technology, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve problems such as difficult growth of molecular sieve membranes

Active Publication Date: 2021-04-20
ANHUI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier, which overcomes the defects on the surface of the molecular sieve membrane caused by air bubbles and the problem that the molecular sieve membrane is not easy to grow due to less synthetic liquid on the inner wall of the tubular carrier , the prepared molecular sieve membrane has good compactness, high repeatability and excellent performance

Method used

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  • A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier
  • A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier
  • A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier

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Embodiment 1

[0041] A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier, comprising the following steps:

[0042] 1) Use 200-mesh, 400-mesh, 1000-mesh and 2000-mesh sandpaper to polish the inner wall of a single-channel tubular ceramic carrier with a length of 200 mm, an inner diameter of 8 mm, and an outer diameter of 12 mm until the inner wall of the carrier is smooth. Ultrasonic wash in water to remove residual powder, then soak in 10% NaOH solution for 24 hours, then ultrasonically shake and wash until the washing water is neutral, and finally, dry in an oven at 110°C for 24 hours.

[0043] 2) Dissolve 0.82g of sodium aluminate in 62g of deionized water, add 19.6g of sodium hydroxide while stirring, keep stirring for 2 hours to completely dissolve and cool to room temperature. Then it was slowly added dropwise to 35 g of silica sol containing 1.5 g of silicon dioxide stirred at high speed, and stirred at room temperature f...

Embodiment 2

[0047] A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier, comprising the following steps:

[0048] 1) Use 200-mesh, 400-mesh, 1000-mesh and 2000-mesh sandpaper to polish the inner side of the seven-channel tubular ceramic carrier with a length of 200 mm, an inner diameter of 3 mm, and an outer diameter of 24 mm until the inner wall of the carrier is smooth, and place the polished ceramic carrier in water Perform ultrasonic washing to remove residual powder, then soak in 30% NaOH solution for 18 hours, then ultrasonically shake and wash until the washing water is neutral, and dry in an oven at 110°C for 24 hours.

[0049] 2) Dissolve 0.82g of sodium aluminate in 62g of deionized water, add 19.6g of sodium hydroxide while stirring, keep stirring for 2 hours to completely dissolve and cool to room temperature. Then it was slowly added dropwise to 35 g of silica sol containing 1.5 g of silicon dioxide stirred at hig...

Embodiment 3

[0053] A method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier, comprising the following steps:

[0054] 1) Use 200-mesh and 1000-mesh sandpaper to polish the inner wall of a single-channel tubular stainless steel carrier with a length of 200 mm, an inner diameter of 8 mm, and an outer diameter of 12 mm until the inner wall of the carrier is smooth, and place the polished porous carrier in water for ultrasonic washing to remove residues powder, then soaked in 1% NaOH solution for 12 hours, then washed with ultrasonic vibration until the washing water is neutral, and dried in an oven at 110°C for 24 hours;

[0055] 2) Dissolve 0.82g of sodium aluminate in 62g of deionized water, add 19.6g of sodium hydroxide while stirring, keep stirring for 2 hours to completely dissolve and cool to room temperature, then slowly add it dropwise to 35g of high-speed stirring containing In the silica sol of 1.5g silicon dioxide, stir at...

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Abstract

The invention provides a method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier. Compared with the prior art, the invention effectively eliminates the synthetic liquid and the synthetic liquid and the synthetic liquid by degassing the synthetic liquid containing the carrier. Air bubbles between the carrier interface, thus avoiding the generation of defects. By maintaining the pressure difference inside and outside the carrier, the inner wall of the tubular carrier can obtain more active components, so that the growth of the molecular sieve membrane on the inner wall of the tubular porous carrier can obtain sufficient raw materials, so that the synthesized molecular sieve membrane is more dense and uniform. The invention has simple preparation process, easy control, high crystallinity, high molecular sieve membrane quality, excellent separation performance and better technical effect.

Description

technical field [0001] The invention belongs to the field of membrane separation and relates to a method for growing a dense and defect-free molecular sieve membrane on the inner wall of a tubular porous carrier. Background technique [0002] Molecular sieve membranes have shown great potential in the field of separation due to their adjustable and uniform pore size, similar pore size to molecular size, high chemical stability, thermal stability and mechanical strength. However, the existing molecular sieve membranes can only be used in the field of organic matter dehydration by means of pervaporation, but cannot achieve the purpose of molecular sieve. Imperfections in molecular sieve membranes are the main reason why gases rely on Knudsen diffusion rather than molecular sieves to pass through molecular sieve membranes. [0003] In order to prepare dense and defect-free molecular sieve membranes, the in-situ growth method and the secondary growth method are the most commonl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/16
CPCC01B39/16C01P2002/72C01P2004/03
Inventor 魏学岭晁自胜潘文燕陈曦胡悦
Owner ANHUI POLYTECHNIC UNIV