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Preparation method of anti-pollution reverse osmosis composite membrane, and reverse osmosis composite membrane

A reverse osmosis composite membrane, anti-pollution technology, applied in the field of composite membranes, can solve problems such as shortening the service life of the membrane, achieve low equipment operation requirements, improve service life, and achieve the effects of scale and continuity

Inactive Publication Date: 2018-06-08
南京湶膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

After membrane fouling occurs, it is necessary to distinguish the type of membrane fouling and perform flushing or pickling or alkaline cleaning. These processes will shorten the service life of the membrane while restoring the membrane flux and desalination rate

Method used

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  • Preparation method of anti-pollution reverse osmosis composite membrane, and reverse osmosis composite membrane
  • Preparation method of anti-pollution reverse osmosis composite membrane, and reverse osmosis composite membrane

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preparation example Construction

[0021] The embodiment discloses a preferred preparation method of reverse osmosis composite membrane and the anti-pollution reverse osmosis composite membrane prepared by the method. The specific operation steps of the preparation method are as follows:

[0022] Step 1: Preparation of polysulfone support membrane:

[0023] The polysulfone support membrane can be prepared by existing techniques. Polysulfone (PSf) and additives are dissolved in a solvent to prepare a casting solution; then filtered, defoamed, and then cast on a non-woven fabric; then immersed in deionized water to gel, thereby making a polysulfone support membrane.

[0024] Among them: the additives are polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), ethylene glycol monomethyl ether (EGME), sodium dodecylbenzenesulfonate (SDBS), sodium dodecylsulfonate ( One or more of SDS); solvents are N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), N-methylpyrrolidone (NMP), dimethyl One or several kinds o...

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Abstract

The invention discloses a preparation method of an anti-pollution reverse osmosis composite membrane. The preparation method comprises the following steps: contacting a polyamine aqueous phase solution with an aromatic polyhydric acyl chloride organic phase solution on the surface of the polysulfone support membrane for carrying out an interfacial polymerization reaction to form an aromatic polyamide desalination layer, coating a prepared anti-pollution coating liquid on the aromatic polyamide desalination layer, carrying out heat treatment for forming an anti-pollution coating, wherein the anti-pollution coating liquid is an acidic mixed solution containing polyacrylamide and aldehydes. Furthermore, the invention also discloses an anti-pollution reverse osmosis composite membrane preparedby the method. According to the invention, the cross-linked anti-pollution coating is formed on the surface of the polyamide desalination layer, the coating is uniform and smooth and is not easy to elute, so that the service life of the membrane is improved; and polyacrylamide with different electric properties are selected, so that the surface of the anti-pollution reverse osmosis membrane is electrically controllable, and the application field of the prepared reverse osmosis membrane is widened.

Description

technical field [0001] The patent of the invention belongs to the composite membrane technology in the technical field of water treatment, and specifically relates to a preparation method of an anti-pollution reverse osmosis composite membrane and an anti-pollution reverse osmosis composite membrane prepared by the method. Background technique [0002] Reverse osmosis membranes are widely used in electric power, petrochemical, steel, electronics, medicine, food and beverage, municipal and environmental protection and other fields, in seawater and brackish water desalination, boiler feed water, industrial pure water and electronic grade ultrapure water preparation, pure drinking It plays an important role in water production, wastewater treatment and special separation processes. Reverse osmosis membranes are generally made of polymer materials, such as cellulose acetate membranes, aromatic polyhydrazide membranes, and aromatic polyamide membranes. In the actual application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/02B01D71/56C02F1/44
CPCB01D61/025B01D67/0006B01D69/125B01D71/56C02F1/441Y02A20/131
Inventor 钮振强朱加生赵亮南晓东高峰
Owner 南京湶膜科技有限公司
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