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Preparation method of reverse osmosis membrane with high throughput and high salt retention rate

A technology of reverse osmosis membrane and rejection rate, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of low permeation flux, improve permeation flux, rational design, improve and eliminate salt rate effect

Inactive Publication Date: 2014-12-17
CHENGDU WISEDONE TECH
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  • Abstract
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Problems solved by technology

However, although the reverse osmosis membrane prepared according to the above-mentioned patent has a high salt rejection rate, the permeation flux is low

Method used

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  • Preparation method of reverse osmosis membrane with high throughput and high salt retention rate
  • Preparation method of reverse osmosis membrane with high throughput and high salt retention rate

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Embodiment Construction

[0017] First, the polysulfone porous membrane was immersed in m-phenylenediamine with a concentration of 1wt / v%, and Et with a concentration of 0.1wt / v%. 3 NH(F 6 acac) 2 Immerse in the aqueous solution for 0.5 minutes, take out and remove the excess solution on the surface; then immerse it in the n-hexane solution of trimesoyl chloride monomer with a concentration of 0.1wt / v%, and react for 1 minute; then at 40 o C curing 20 minutes in the oven, molding.

[0018] This film is at 25 o C, under the pressure of 0.8MPa, the separation results for 30000ppm NaCl aqueous solution are: the salt rejection rate is 99.6%, and the water flux is 37 L.m -2 .h -1 .

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Abstract

The invention discloses a preparation method of a reverse osmosis membrane with a high throughput and high salt retention rate, and belongs to the technical field of reverse osmosis membrane separation in water treatment. The reverse osmosis membrane is prepared by covering a porous carrier membrane by a mixed solution of a polyamine water solution containing a throughput increasing agent and an organic poly(acyl chloride) solution; and the throughput increasing agent will participate in the interface polymerization reactions and completely crosslinks with the polyamine and acyl chloride to form a polyamide membrane layer with a special throughput promoting function. The design of the preparation method is reasonable, and the reverse osmosis membrane has the advantages of high throughput, high salt retention rate, easy preparation, and wide application range.

Description

technical field [0001] The invention relates to a preparation method of a reverse osmosis membrane with high flux and high salt rejection rate, and belongs to the technical field of water treatment reverse osmosis membrane separation. Background technique [0002] The reverse osmosis membrane is a semi-permeable membrane made of special materials and processing methods. It can selectively permeate a certain component of the aqueous solution under the action of external pressure, so as to achieve the purpose of desalination, purification or concentration separation. Compared with other technologies, reverse osmosis technology has a simpler operation mode and can effectively remove organic substances such as salts, small molecular acids, aldehydes, and phenols in water. Applications include desalination of seawater, desalination of brackish water, purification of drinking water, production of industrial ultrapure water, and recycling and treatment of industrial wastewater suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/12B01D71/56
Inventor 惠志锋
Owner CHENGDU WISEDONE TECH
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