Method for improving reverse osmosis compound film separating property

A technology of reverse osmosis composite membrane and separation performance, which is applied in the field of improving the separation performance of polyamide reverse osmosis composite membrane, can solve the problems of reducing the membrane rejection rate, and achieve the goals of simple and convenient operation, improved performance, large flux and interception rate Effect

Inactive Publication Date: 2009-03-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent also pointed out that if an excessive amount of alcohol is added, due to the reduction of the solubility difference between the amine aqueous solution and the acid halide organic solution, the polymerization reaction is not carried out at the interface, which will reduce the rejection rate of the membrane.

Method used

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  • Method for improving reverse osmosis compound film separating property
  • Method for improving reverse osmosis compound film separating property
  • Method for improving reverse osmosis compound film separating property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0020] A polysulfone support membrane as previously described was used. The concentration of preparing m-phenylenediamine aqueous solution is 20g / L, and the n-hexane solution concentration of trimesoyl chloride is 3g / L, then in the m-phenylenediamine aqueous solution, add cetyl trimethyl ammonium chloride of different quality, Stir evenly, let it stand for a few minutes, then immerse one side of the wet polysulfone support membrane into the solution, soak for about ten minutes, then take it out and gently squeeze the surface of the support membrane dry with a glass rod, and mix with trimesoyl chloride The interfacial polymerization reaction was carried out by one-sided contact of n-hexane solution. After the composite membrane is dried in the air, it is treated in a vacuum oven at 60-80° C. for 10-20 minutes, and finally the composite membrane is taken out and rinsed with deionized water for about half an hour. The prepared composite membrane was stored in water, and the flux...

Embodiment 5-8

[0026] Same as method in embodiment 1-4, just change the concentration of m-phenylenediamine aqueous solution into 12g / L, the n-hexane concentration of trimesoyl chloride is still 3g / L. These four examples can reflect that the improvement of membrane performance by phase transfer catalyst is more obvious when the concentration of reactive monomer is lower.

[0027]

[0028] * The amount of cetyltrimethylammonium chloride added is the relative mass to the mass of phenylenediamine in the aqueous solution.

Embodiment 9-12

[0030] Same as method in embodiment 1-4, just change the concentration of the m-phenylenediamine aqueous solution into 12g / L, then change the phase transfer catalyst cetyltrimethylammonium chloride into tetrabutylammonium chloride therein . These four examples are to investigate the effect of adding tetrabutylammonium chloride on the membrane performance.

[0031]

[0032] * The amount of tetrabutylammonium chloride added is the relative mass to the mass of m-phenylenediamine in the aqueous solution.

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Abstract

The invention discloses a method for improving the separating property of a reverse osmosis composite membrane. The method comprises the following steps: preparing a reverse osmosis membrane by interfacial polymerization to aqueous solution of m-phenylene diamine and normal hexane solution of trimesoyl chloride on a supporting membrane, adding a quaternary ammonium salt phase-transfer catalyst into the aqueous solution of the m-phenylene diamine to accelerate the reaction of the interfacial polymerization and improve the crosslinking degree of a polyamide polymer so as to obtain the reverse osmosis composite membrane which has good hydrophilicity, good mechanical stability, thermal stability and hydrolytic stability. The operation process of the method is simple and convenient, and the method for adding the phase-transfer catalyst and the added quantity are easy to control, thereby bringing great convenience to industrial production.

Description

technical field [0001] The invention relates to a method for improving the separation performance of a polyamide reverse osmosis composite membrane, in particular to a method for improving the membrane performance by adding a quaternary ammonium salt phase transfer catalyst into the reaction water item. Background technique [0002] In order to supply a large amount of brine and seawater for industrial and domestic applications, it needs to be desalinated. At present, the most commonly used and effective desalination method is reverse osmosis membrane filtration. Using this reverse osmosis membrane for desalination treatment of brine or seawater is to filter brine through the reverse osmosis membrane to remove the salt, cleaved ions or particles that cannot pass through the membrane, and obtain purified water that passes through. At this time, the water supply The higher the solute concentration, the higher the osmotic pressure, and the higher the pressure required in the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
Inventor 张林邱实陈欢林
Owner ZHEJIANG UNIV
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