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Molecular sieve composite membrane

A molecular sieve and composite membrane technology, applied in the field of composite membranes, can solve problems such as unsuitability for preparation, long molecular sieve membranes, mechanical strength problems, etc., and achieve high industrial application value, high film forming repeatability, and prevent pressure loss.

Inactive Publication Date: 2010-05-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems with the mechanical strength of this type of composite support, and it is not suitable for the preparation of relatively long molecular sieve membranes.

Method used

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  • Molecular sieve composite membrane

Examples

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preparation example Construction

[0018] The molecular sieve composite membrane is composed of 40-90wt% molecular sieve particles with a particle size of 0.1-5m and 10-60wt% organic polymers or organic polymer mixtures on the inner surface of a porous multi-channel composite support. The specific preparation method of a multi-channel molecular sieve composite membrane composed of molecular sieve polycrystalline membranes of the same type of micro particles includes the following steps:

[0019] 1) Add sodium aluminate to distilled water and stir fully to form an aluminum solution, dissolve sodium hydroxide in distilled water, add silicon source after clarification, heat and stir to form a silicon solution, add aluminum solution to silicon solution and stir to make The composition of the reaction solution for the synthesis of molecular sieve membrane: Na 2 O: Al 2 O 3 : SiO 2 : H 2 O=1-20:1:1:1-200:50-5000;

[0020] 2) Pour the reaction solution of the synthetic molecular sieve membrane into the high pressure reacto...

Embodiment 1

[0025] 1) Take 100g of polyethersulfone resin (PES), 300g of 1-methyl-2-pyrrolidone and mix, then add 150g of tetraethylene glycol and stir to form a uniform solution. Then add 400g of A molecular sieve with an average particle size of 2m to prepare a uniform slurry as the spinning dope. A multi-channel spinning head is used, and the core liquid and the coagulation bath are wet-spinning with 40℃ heat preservation water and an air distance of 10cm. The obtained multi-channel support was immersed in a 60°C pool for 6 hours, and finally the support was placed in an oven at 60°C and dried for 3 hours. A multi-channel composite support with an outer diameter of 31mm and 19 channels was prepared;

[0026] 2) Add sodium metaaluminate to distilled water and stir fully to form an aluminum solution, dissolve sodium hydroxide in distilled water, add sodium silicate after clarification, heat and stir to form silicon solution, add aluminum solution to silicon solution and stir to prepare Th...

Embodiment 2

[0029] 1) Take 100 g of polyacrylonitrile and 300 g of 1-methyl-2-pyrrolidone and mix, then add 150 g of tetraethylene glycol and stir to form a uniform solution. Then add 900g of A molecular sieve with an average particle size of 2m to form a uniform slurry and use it as a spinning dope. A multi-channel spinning head is used, the core liquid and the coagulation bath are made of water at 40°C, and the air distance is 10cm for wet spinning. The obtained multi-channel support was immersed in a 60°C pool for 6 hours, and finally the support was placed in an oven at 60°C and dried for 3 hours. A multi-channel composite support with an outer diameter of 31mm and 19 channels is produced;

[0030] 2) Add sodium metaaluminate to distilled water and stir thoroughly to form an aluminum solution, dissolve sodium hydroxide in distilled water, add sodium metasilicate after clarification, heat and stir to form silicon solution, add aluminum solution to silicon solution and stir, The reaction...

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Abstract

The invention discloses a molecular sieve composite membrane which is a multichannel molecular sieve composite membrane formed by molecular sieve polycrystal membranes, which are the same kind as the molecular sieve particles constituting the support body, on the internal surface of a porous multichannel composite support body formed by 40-90 wt% of molecular sieve particles (the particle sizes are 0.1-5 m) and 10-60 wt% of organic macromolecules or organic macromolecule mixture. The preparation method comprises the following steps: (1) adding sodium aluminate to distilled water, sufficiently stirring to form an aluminum solution, dissolving sodium hydroxide in the distilled water, defecating, adding a silicon source, heating and stirring to form a silicon solution, adding the aluminum solution into the silicon solution, and stirring to prepare reaction liquor for synthesizing the molecular sieve membrane; (2) and pouring the reaction liquor into a high pressure reactor, directly and perpendicularly inserting the organic macromolecular / molecular sieve composite support body into the reaction liquor to carry out the hydrothermal synthesis, cooling after crystallizing, washing with distilled water to be neutral, and drying to obtain the molecular sieve composite membrane. The invention has the advantages of simple operation, high repetitiveness of membrane formation and favorable performance, and is suitable for industrial magnification.

Description

Technical field [0001] The invention relates to a composite membrane, in particular to a molecular sieve composite membrane. Background technique [0002] Distillation is a widely used method to select and separate water and organic matter from a homogeneous mixed solution formed by water and organic matter. However, ethanol, isopropanol, butanol, etc., mixed with water to a certain concentration will form an azeotropic state, so it cannot be separated by conventional distillation. Need to add harmful substances like benzene as the third component, energy consumption is also increased, so it is necessary to seek alternative separation methods. [0003] An alternative to the azeotropic distillation method is pressure adsorption (PSA method) (Japanese Patent Laid-Open No. 2000-334257). This is to inject a water-containing organic solvent into a container equipped with a hydrophilic molecular sieve. The molecular sieve absorbs water during the pressurization process, removes the abs...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/10B01D69/12
Inventor 王正宝葛琴琴李显明严玉山
Owner ZHEJIANG UNIV
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