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Method for preparing composite reverse osmosis membrane

A technology of reverse osmosis membrane and membrane casting solution, which is applied in the field of membrane separation, can solve the problem of insufficient water flux of composite reverse osmosis membrane, and achieve the effect of improving water flux, increasing flux, and improving hydrophilicity

Pending Publication Date: 2018-10-19
NANJING DELNAMEM TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the water flux of the composite reverse osmosis membrane is not high enough in the prior art, the present invention provides a preparation method of the composite reverse osmosis membrane, which involves grafting the non-woven fabric of the composite reverse osmosis membrane with chlorosulfonic acid Water-based sulfonic acid groups, increasing the hydrophilicity of non-woven fabrics to improve the water flux of composite reverse osmosis membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Sulfonation of non-woven fabric: Put the non-woven fabric into the sulfonation reactor in advance, add 1% chlorosulfonic acid solution in chloroform to the reactor, and carry out the sulfonation reaction under normal temperature and pressure for 1 hour, and no The woven fabric was taken out and put into a 1% sodium hydroxide solution for neutralization, washed with clean water, and put into an oven to heat and dry the water on the surface of the non-woven fabric to obtain a sulfonated non-woven fabric.

[0036] Scraping of the polysulfone porous support layer: Weigh 1.5 kg of polysulfone and put it in a 110°C oven for 1 h. The polysulfone was added to 8.4 kg of DMF solvent, and after stirring at 70° C. to fully dissolve, 0.1 kg of PEG-400 was added, and the mixture was uniformly stirred to obtain a good casting solution. The film casting liquid was stored at a constant temperature of 40°C for 8 hours to remove the bubbles in the film casting liquid, and the film casting...

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Abstract

The invention discloses a method for preparing a composite reverse osmosis membrane. The composite reverse osmosis membrane comprises non-woven cloth, a porous support layer coated on the non-woven cloth, and a polyamide desalting layer coated on the porous support layer; the non-woven cloth is subjected to chlorosulfonic acid sulfonation treatment and is grafted with sulfonic acid groups; the porous support layer is a casting film liquid to be coated on the non-woven cloth and is prepared by using a phase conversion method; the polyamide desalting layer is prepared through an interface polymerization reaction of a water phase solution with two or more amino compounds and an oil phase solution with two or more acyl chloride compounds on the porous support layer. The prepared composite reverse osmosis membrane has a high water flux.

Description

technical field [0001] The invention relates to membrane separation technology, and furthermore, relates to a preparation method of a composite reverse osmosis membrane. Background technique [0002] With the rapid development of national industrialization, water pollution has become a major problem to be solved urgently in the country. People's pursuit of a healthy life forms a sharp contradiction with the deteriorating drinking water. In order to solve the problems of industrial wastewater treatment and people's daily water use, various water treatment technologies have emerged. Among them, composite reverse osmosis has the advantages of excellent separation performance of small organic molecules and inorganic salt ions, as well as safety, environmental friendliness, and easy operation. And become one of the key technologies of water treatment. Composite reverse osmosis technology is widely used, including seawater and brackish water desalination, hard water softening, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D69/10C02F1/44
CPCB01D61/025B01D67/0011B01D69/105B01D69/12C02F1/44Y02A20/131
Inventor 刘星武少禹
Owner NANJING DELNAMEM TECH CO LTD
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