Preparation method of high-flux porous membrane

A porous membrane and high-flux technology, applied in the field of membrane separation, can solve the problem of small increase

Inactive Publication Date: 2004-06-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Just as India applied for patent appl.1811 / DEL / 96, 1996, using inorganic halides as additives, although it can increase the water permeability of polyacrylonitrile membranes, the increase is not large

Method used

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  • Preparation method of high-flux porous membrane
  • Preparation method of high-flux porous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add 9g of polyethersulfone and 1.5g of calcium chloride (as an additive) into 39.5g of N,N-dimethylformamide (DMAC, as a solvent), and wait until completely dissolved to form a uniform and stable membrane solution. The film liquid is salivated onto the non-woven fabric with a scraper, and the thickness of the film before gelation is controlled by a metal wire tied on the scraper, and the diameter of the metal wire is 0.235mm in this example. The non-woven fabric with the film liquid is quickly put into the gel bath, the composition of the gel bath is 20wt.% sodium carbonate aqueous solution, and the temperature of the gel bath is 30°C. , the additive will chemically react with the gel medium to form calcium carbonate precipitates. After the membrane gel is formed, the membrane is washed with water and then post-treated. Soak the membrane in 0.5wt% dilute hydrochloric acid at 40°C and take it out after 5 hours. The cross-section of the obtained porous membrane is shown...

Embodiment 2

[0033] The same film-making process, post-treatment and measurement methods as in Example 1, except that the polymer is polyacrylonitrile. The pure water flux and rejection rate of the membrane are 530l / m 2 .h and 90%. The cross-section of the obtained porous membrane is shown in figure 2 .

Embodiment 3

[0035] The same film-making process, post-treatment and measurement methods as in Example 2, except that the gel bath is a 20wt.% potassium carbonate aqueous solution. The pure water flux and rejection rate of the membrane are 480l / m 2 .h and 90%.

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Abstract

A process for preparing high-pass porous membrane mainly comprising, dissolving polymer (polyethersulfone orpolyacrylonitile) and inorganic additive into suitable organic solvent, mixing the mixture into casting film liquid uniformly after complete dissolution, slobbering the casting film liquid onto the nonwoven fabric supporting body, immersing the nonwoven fabrics with casting film liquid into suitable gel agent, the additive reacting with the gel medium, the membrane liquid on the nonwoven fabrics simultaneously forming porous membrane in the gel bath, and submerging the porous membrane in acid solution. The invention can be applied for obtaining membrane having increased water flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a high-flux asymmetric porous membrane. Background technique [0002] In the last two decades, membrane separation technology has developed rapidly and has been widely used in various fields such as food industry, pharmaceutical industry, sanitation and environmental protection. According to the structure of the membrane, the membrane can be divided into dense membrane and porous membrane. According to the size of the membrane separation object, the membrane can be divided into reverse osmosis membrane, ultrafiltration membrane and microfiltration membrane. Both ultrafiltration membrane and microfiltration membrane are porous membranes. range. The development of porous membranes has played a decisive role in the development of membrane separation technology, but factors such as the price, service life, and cleaning cycle of membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D69/10B01D71/42B01D71/68
Inventor 刘忠洲杨森
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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