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A kind of preparation method of hierarchical porous sapo-34 molecular sieve membrane

A SAPO-34 and molecular sieve technology, applied in the chemical industry, can solve the problems of no multi-level pores, SAPO-34 molecular sieve membrane reports, etc.

Active Publication Date: 2022-01-21
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently synthesized SAPO-34 molecular sieve membranes are all microporous structures, and there is no report on multi-level porous SAPO-34 molecular sieve membranes

Method used

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  • A kind of preparation method of hierarchical porous sapo-34 molecular sieve membrane

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preparation example Construction

[0025] The first aspect of the present invention provides a kind of preparation method of hierarchical porous SAPO-34 molecular sieve membrane, described method comprises:

[0026] 1) uniformly coating SAPO-34 molecular sieve seeds on the surface of the porous carrier;

[0027] 2) placing the porous carrier coated with the SAPO-34 molecular sieve seed crystal in step 1) in the hydrothermal mother liquor of the SAPO-34 molecular sieve membrane for hydrothermal synthesis to obtain the SAPO-34 molecular sieve membrane;

[0028] 3) The SAPO-34 molecular sieve membrane obtained in the step 2) is dip-coated with solution A, and under the atmosphere condition of the gas phase B, the xerogel conversion is carried out, and the template agent is removed by roasting, the solution A includes water, and the Solution A may also optionally include a first templating agent and / or a first auxiliary templating agent, and the gas phase B includes H 2 O, the gas phase B can also optionally inclu...

Embodiment 1

[0048] 1) Add 31.13g tetraethylammonium hydroxide solution (TEAOH, 35wt%) in 2.46g deionized water, stir well, then add 7.56g aluminum isopropoxide, stir at room temperature for 3h; dropwise add 1.665g silica sol (AS- 40), stirred for 1h; slowly added dropwise 8.53g phosphoric acid solution (H 3 PO 4 , 85wt%), stirred overnight. Using microwave heating, crystallization at 180°C for 7h, centrifugation, washing, and drying to obtain SAPO-34 molecular sieve seed crystals, the morphology and XRD pattern of SAPO-34 molecular sieve seed crystals are as follows figure 1 shown.

[0049] A 100nm porous alumina ceramic membrane tube is used as a carrier, both ends of the carrier are glazed, and the outer surface is sealed with a tetrafluoro tape, and the seed crystal obtained in step 1) is brushed onto the inner surface of the ceramic membrane tube.

[0050] 2) Add 5.67g aluminum isopropoxide to 32.84g deionized water, stir evenly, then add dropwise 3.2g phosphoric acid solution (H ...

Embodiment 2

[0054] 1) Add 31.13g tetraethylammonium hydroxide solution (TEAOH, 35wt%) in 2.46g deionized water, stir well, then add 7.56g aluminum isopropoxide, stir at room temperature for 3h; dropwise add 1.665g silica sol (AS- 40), stirred for 1h; slowly added dropwise 8.53g phosphoric acid solution (H 3 PO 4 , 85wt%), stirred overnight. Using microwave heating, crystallization at 180°C for 7h, centrifugation, washing, and drying to obtain SAPO-34 molecular sieve seed crystals, the morphology and XRD pattern of SAPO-34 molecular sieve seed crystals are as follows figure 1 shown.

[0055] A 100nm porous alumina ceramic membrane tube is used as a carrier, both ends of the carrier are glazed, and the outer surface is sealed with a tetrafluoro tape, and the seed crystal obtained in step 1) is brushed onto the inner surface of the ceramic membrane tube.

[0056] 2) Add 5.67g aluminum isopropoxide to 32.84g deionized water, stir evenly, then add dropwise 3.2g phosphoric acid solution (H ...

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Abstract

The invention belongs to the field of chemical industry, in particular to a preparation method of a multi-level porous SAPO-34 molecular sieve membrane. The method comprises: 1) SAPO-34 molecular sieve crystal seeds are evenly coated on the surface of the porous carrier; 2) the porous carrier coated with SAPO-34 molecular sieve seeds in step 1) is placed in the SAPO-34 molecular sieve membrane hydrothermal mother liquor 3) Dip-coat the SAPO-34 molecular sieve membrane obtained in the step 2) with solution A, and perform xerogel conversion and roasting under the atmosphere condition of gas phase B Remove the template agent, the solution A includes water, the solution A may optionally include the first template agent and / or the first auxiliary template agent, and the gas phase B includes H 2 O, the gas phase B may optionally include a second templating agent and / or a second templating aid. Using this method, a non-penetrating multi-level pore structure can be formed on the surface of the molecular sieve, which can increase the diffusion rate of gas molecules in the gas separation process, reduce the mass transfer resistance of the molecular sieve membrane separation layer, and improve the permeability of the SAPO‑34 molecular sieve membrane.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a preparation method of a silicon-aluminum-phosphorus molecular sieve membrane, in particular to a preparation method of a multi-level porous SAPO-34 molecular sieve membrane. Background technique [0002] Membrane separation has many advantages such as no phase change, low energy consumption, simple operation, large separation coefficient, and operating temperature close to room temperature. It is an important technology to solve the current energy and environmental problems faced by human beings. One of the most promising technologies in the medium term. Compared with organic membranes, inorganic membranes have better chemical stability and higher mechanical strength under high temperature and high pressure conditions, so they have attracted people's attention. SAPO-34 molecular sieve membrane has its unique pore structure, and is widely used in the fields of gas separation, per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D53/22C01B37/08C01B39/54
CPCB01D53/228B01D67/0048B01D71/028C01B37/08C01B39/54
Inventor 胡登孙楠楠余伟胜朱天阳魏伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI