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Preparation method of pipe type inorganic-organic compound micro-filtration membrane

A microfiltration membrane and organic technology, which is applied in the field of preparation of tubular inorganic-organic composite microfiltration membranes, can solve the problems of increasing the preparation cost of composite membranes, unfavorable industrialization of the preparation process, and unfavorable large-scale production, etc., and shorten the production process. cycle, avoid high temperature sintering process, simple and fast preparation effect

Active Publication Date: 2015-01-28
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore diameter of the ceramic tube used in this composite membrane is 1.2 μm, and the preparation method is to pour the membrane liquid directly into the support. When the concentration of the membrane liquid is high, it is difficult to achieve a uniform coating of the membrane liquid on the support. cover, not conducive to mass production
[0006] It can be seen that the pore size of the support used in the preparation process of the inorganic-organic composite microfiltration membrane is between 0.5-1.2 μm, and it is directly coated on the basis of the ceramic microfiltration membrane, which invisibly increases the The preparation cost of the composite film, and the preparation process is not conducive to industrialization

Method used

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  • Preparation method of pipe type inorganic-organic compound micro-filtration membrane
  • Preparation method of pipe type inorganic-organic compound micro-filtration membrane
  • Preparation method of pipe type inorganic-organic compound micro-filtration membrane

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preparation example Construction

[0041] refer to figure 1 , a method for preparing a tubular inorganic-organic composite microfiltration membrane proposed by the present invention, comprising:

[0042] S1. Use inorganic ceramic tubes as supports.

[0043] S2. A rigid organic polymer with a high glass transition temperature (Tg) is used as an intermediate layer material, and an intermediate layer film is formed on the surface of the inorganic ceramic tube by vacuum coating and dry phase inversion.

[0044] Wherein, Tg≥200°C, more preferably Tg≥210°C, further preferably Tg≥220°C, further preferably Tg≥230°C, further preferably Tg≥240°C, further preferably Tg≥250°C. Specifically, the high glass transition temperature (Tg) rigid organic polymer includes at least one of polyarylsulfone, polyethersulfone, polyetherketone, phenolphthalein-based polyethersulfone or phenolphthalein-based polyetherketone. During the preparation process, a rigid organic polymer with a high glass transition temperature (Tg) is dissolve...

Embodiment 1

[0051] In Example 1 of the present invention: the material of the inorganic ceramic tube is α-Al 2 o 3 , The configuration is a single channel, the pore size is 0.2-2μm; the rigid organic polymer with high Tg is polyaryl sulfone; the hydrophilic organic polymer is cellulose acetate. The vacuum degree of the pump was 0.02 MPa during the decompression coating process, and the temperature and humidity were 20° C. and 60% during the dry phase inversion process.

[0052] A kind of preparation method of the tubular inorganic-organic composite microfiltration membrane that embodiment 1 proposes, comprising:

[0053] S1. Clean the inorganic ceramic tube with deionized water, then soak it in deionized water for 8 hours, and then dry it at 60°C for 12 hours;

[0054] S2. Prepare 10% polyarylsulfone coating solution, the solvent used is N-methylpyrrolidone, use polyarylsulfone coating solution to carry out decompression coating on the inner surface of the inorganic ceramic tube, and th...

Embodiment 2

[0059] In Example 2 of the present invention: the material of the inorganic ceramic tube is α-Al 2 o 3 , The configuration is a single channel, the pore size is 2-10μm; the rigid organic polymer with high Tg is polyaryl sulfone; the hydrophilic organic polymer is cellulose acetate. The vacuum degree of the pump was 0.02 MPa during the decompression coating process, and the temperature and humidity were 40° C. and 70% during the dry phase inversion process.

[0060] A kind of preparation method of the tubular inorganic-organic composite microfiltration membrane that embodiment 2 proposes, comprising:

[0061] S1. Wash the inorganic ceramic tube with deionized water, then soak it in deionized water for 8 hours, and then dry it at 60° C. for 12 hours.

[0062] S2. Prepare 20% polyarylsulfone coating solution, the solvent used is N-methylpyrrolidone, use polyarylsulfone coating solution to carry out decompression coating on the inner surface of the inorganic ceramic tube, and th...

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Abstract

The invention discloses a preparation method of a pipe type inorganic-organic compound micro-filtration membrane. The method comprises the flowing steps: forming a middle membrane on the surface of an inorganic ceramic pipe by decompression coating and dry phase converting, wherein the inorganic ceramic pipe is used as a supporting body, and a rigid organic polymer with high glass transition temperature (Tg) is used as a middle material; forming a separating layer membrane on the surface of the middle membrane by the decompression coating and the dry phase converting, wherein a hydrophilic organic polymer is used as a separating layer material so as to obtain a compound layer membrane; and performing wet phase converting on the obtained compound layer membrane to prepare the pipe type inorganic-organic compound micro-filtration membrane. In the method, the easy and fast preparation of the pipe type inorganic-organic compound micro-filtration membrane can be realized under a mild condition, the preparation cost of the ceramic micro-filtration membrane is reduced, and simultaneously the separation selection performance of the ceramic micro-filtration membrane is improved.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation method of a tubular inorganic-organic composite microfiltration membrane. Background technique [0002] Inorganic ceramic microfiltration membranes have the advantages of high temperature resistance, corrosion resistance, easy cleaning, and long service life. They are widely used in the treatment of oily wastewater, filtration and sterilization in the pharmaceutical industry, and separation and purification of active ingredients in the food industry. However, in the preparation process of inorganic ceramic microfiltration membranes, an inorganic nanopowder layer (such as Al 2 o 3 、TiO 2 , ZrO 2 etc.), the inorganic nano-powders used have higher requirements on the particle size distribution and are expensive, coupled with the high-temperature sintering process, the yield is not high, which increases the cost of the inorganic ceramic microfiltration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D69/12B01D69/10B01D67/00
Inventor 徐铜文李兴亚
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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