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Aromatic polyamide reverse osmose composite membrane

A technology of reverse osmosis composite membrane and aromatic polyamide, applied in the field of water separation

Active Publication Date: 2007-03-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although membrane technology has made great progress, the existing membrane materials cannot meet people's needs. Under the condition of not losing the salt rejection rate, the flux of the membrane needs to be further improved, and new monomers and new materials are required. Appear

Method used

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  • Aromatic polyamide reverse osmose composite membrane
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  • Aromatic polyamide reverse osmose composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 99.0g of polysulfone with a mass concentration of 16.5%, 81.0g of ethylene glycol monomethyl ether with a mass concentration of 13.5%, and 0.18g of sodium dodecylsulfonate with a mass concentration of 0.03% were dissolved in 419.8gN,N-di In methyl formamide, it is coated on the polyester non-woven fabric, and then immersed in water to remove the good solvent to obtain a support layer with a molecular weight cut off (MWCO) of about 20,000, and then stored in deionized water for later use.

[0067] Cover the surface of the wet polysulfone support membrane with an aqueous solution of m-phenylenediamine with a mass volume concentration (g / ml) of 2% for 3 minutes, then pour off the excess amine solution, dry in the air for 6 minutes, and then mix with 3,4 ', 5-biphenyltrichloride mass volume concentration (g / ml) is 0.05% cyclohexane solution single-sided contact to carry out interfacial polymerization reaction for 20 seconds. It is then subjected to the first heat treatment:...

Embodiment 2

[0069] Example 2. A cyclohexane solution with a mass volume concentration (g / ml) of 0.10% of 3,4',5-biphenyltrichloride was used, and the rest of the conditions were the same as in Example 1. The test result is: flux 33.1l / m 2 .h, the desalination rate is 99.1%.

Embodiment 3

[0070] Example 3. A cyclohexane solution with a mass volume concentration (g / ml) of 0.15% of 3,4',5-biphenyltrichloride was used, and the rest of the conditions were the same as in Example 1. The test result is: flux 23.8l / m 2 .h, the desalination rate is 97.5%.

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Abstract

The present invention relates to a new-type aromatic polyamide reverse osmosis composite membrane containing diphenyl structure. It is prepared by utilizing aromatic polybasic acyl chloride containing diphenyl structure and aromatic polyamide to make them implement interfacial polycondencation reaction on the polysulfone supporting layer. It can be extensively used in the fields of sea-water desalination and preparation of ultrapure water.

Description

technical field [0001] The invention belongs to water separation technology, in particular to an aromatic polyamide reverse osmosis composite membrane containing a biphenyl structure. Background technique [0002] Reverse osmosis membranes are mainly divided into two categories: one is cellulose acetate membrane; the other is aromatic polyamide membrane. Among them, due to the narrow pH range, easy hydrolysis, high operating pressure requirements, and rapid performance decay, the market share of cellulose acetate membranes has gradually decreased. The aromatic polyamide reverse osmosis composite membrane has the advantages of high desalination rate, large water flux, wide application pH range, and biodegradation resistance. The disadvantage is that it is not resistant to free chlorine oxidation and occupies the vast majority of the market share. Most of the aromatic polyamide reverse osmosis composite membranes currently produced in industry are prepared by interfacial poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12
Inventor 张所波李磊王献红
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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