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Polyamide reverse osmosis composite membrane containing biphenyl structure and production method thereof

A technology of reverse osmosis composite membrane and biphenyl structure, applied in the field of water treatment

Inactive Publication Date: 2008-12-31
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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  • Polyamide reverse osmosis composite membrane containing biphenyl structure and production method thereof
  • Polyamide reverse osmosis composite membrane containing biphenyl structure and production method thereof
  • Polyamide reverse osmosis composite membrane containing biphenyl structure and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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 419.8g N, N- In dimethylformamide, it is coated and scratched on 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.

[0044]The mass volume concentration (g / ml) is 2% m-phenylenediamine aqueous solution to cover the polysulfone supporting membrane surface of wet state for 3 minutes, pour off excess amine liquid then, dry in the air for 6 minutes, then compare with the mass volume concentration (g / ml) is the isopar solution of 0.05% 2,2',4,4'-biphenyl tetracarbonyl chloride (isopar is purchased from Idemitsu Kosan Co., Ltd., IDEMITSU Chemical Co.Ltd) in single-sided contact for interfacial p...

Embodiment 2

[0046] Example 2. A cyclohexane solution with a mass volume concentration (g / ml) of 0.10% of 2,2',4,4'-biphenyltetrayl chloride was used, and the rest of the conditions were the same as in Example 1. The test result is: flux 51.2l / m 2 .h, the desalination rate is 97.2%.

Embodiment 3

[0047] Example 3. A cyclohexane solution with a mass volume concentration (g / ml) of 0.15% of 2,2',4,4'-biphenyltetrayl chloride was used, and the rest of the conditions were the same as in Example 1. The test result is: flux 44.3l / m 2 .h, the desalination rate is 97.5%.

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Abstract

The invention relates to a polyamide antiosmosis composite film which contains a biphenyl structure and a preparation method thereof. The polyamide antiosmosis composite film is prepared by utilizing the novel aromatic polybasic acyl chloride which contains the biphenyl structure and a mixture thereof, and aromatic polybasic amine and a mixture thereof on a porous polysulfone support layer by interfacial polymerization. By selecting appropriate preparation condition, the antiosmosis composite film has excellent performance. The flux of the polyamide antiosmosis composite film can reach 63.81 / m<2>.h and the desulfurization ratio can reach 99.1 percent. The polyamide antiosmosis composite film prepared by utilizing the invention has simple preparation technology, better control condition, low cost and wide practicability. The polyamide antiosmosis composite film can be applied to the fields of seawater desalination, brackish water desalination ultrapure water preparation and so on.

Description

technical field [0001] The invention belongs to water treatment technology, in particular to a polyamide reverse osmosis composite membrane containing a biphenyl structure and a preparation method. 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 it occupies the vast majority of the market share. Most of the aromatic polyamide reverse osmosis composite membranes currently produced in industry are prepared b...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/10
Inventor 张所波李磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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