Molecular sieve composite membrane

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

Inactive Publication Date: 2012-05-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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 0.1-5μm and 10-60wt% organic polymer or organic polymer mixture. On the inner surface of the porous multi-channel composite support, the support is composed of molecular sieve The multi-channel molecular sieve composite membrane composed of molecular sieve polycrystalline membranes of the same type of microparticles, the specific preparation method includes the following steps:

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

[0020] 2) Pour the reaction solution for synthesizing...

Embodiment 1

[0025] 1) Mix 100g of polyethersulfone resin (PES) and 300g of 1-methyl-2-pyrrolidone, then add 150g of tetraethylene glycol and stir to form a uniform solution. Then add 400 g of A-type molecular sieves with an average particle diameter of 2 μm to prepare a uniform slurry as a spinning stock solution. A multi-channel spinning head is used, the core liquid and the coagulation bath liquid are kept in water at 40° C., and the air distance is 10 cm for wet spinning. The obtained multi-channel support body was soaked in a 60° C. water pool for 6 hours, and finally the support body was placed in a 60° C. oven 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 a silicon solution, add the aluminum solution to t...

Embodiment 2

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

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

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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 for the selective separation of water and organic matter from a homogeneously mixed solution formed of water and organic matter. However, ethanol, isopropanol, and butanol will form an azeotropic state when mixed with water to a certain concentration, so they cannot be separated by conventional distillation. It is necessary to add harmful substances such as benzene as the third component, and the energy consumption is also increased, so it is necessary to find an alternative separation method. [0003] One method that replaces 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 containing a hydrophilic molecular sieve. The molecular sieve absorbs water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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