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Antioxidant reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, anti-oxidation technology, applied in chemical instruments and methods, reverse osmosis, semi-permeable membrane separation, etc., can solve the problems of short service life, limited tolerance of oxidative substances, limited application, etc. Receptivity and separation performance, good water quality for wastewater recovery, and long service life

Pending Publication Date: 2022-02-25
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing reverse osmosis membrane products on the market have limited tolerance to oxidizing substances, thus limiting their application in the field of microbial pollution and treatment of water sources containing oxidizing substances
[0003] Conventional reverse osmosis membranes contain a large number of amide groups, and amide groups have poor oxidation resistance and are easily oxidized and degraded. When used in special scenarios, there are problems such as short service life and unstable desalination rate of wastewater. Lower the cost of wastewater reuse and affect the final reverse osmosis effect
Some companies use pre-treatment methods to pre-treat microbial contamination and oxidative substances in water sources to reduce damage to the reverse osmosis membrane itself, which increases additional costs

Method used

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  • Antioxidant reverse osmosis membrane and preparation method thereof
  • Antioxidant reverse osmosis membrane and preparation method thereof

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preparation example Construction

[0023] A method for preparing an anti-oxidation reverse osmosis membrane, comprising the following steps:

[0024] Step 1) The base layer is prepared, and a polyamide desalination layer is formed on the surface of the base layer through the interfacial polymerization reaction between the polyamine solution and the polyacid chloride solution to obtain a basic reverse osmosis membrane.

[0025] The polyamine is at least one of p-phenylenediamine, m-phenylenediamine, o-phenylenediamine liquid, diethylenetriamine and triethylenetetramine, and the polyacyl chloride is isophthaloyl chloride, terephthaloyl At least one of formyl chloride, phthaloyl and trimesoyl chloride. The concentration of the polyamine solution is 0.5-5 wt%, and the concentration of the polyacyl chloride solution is 0.2-4 wt%.

[0026] Step 2) Select suitable polyvinyl alcohol, cross-linking agent, acid catalyst and anti-oxidation substance to configure anti-oxidation coating solution, coat the anti-oxidation co...

Embodiment 1

[0032] In this embodiment, the reverse osmosis membrane product is prepared by the above-mentioned method, wherein the interfacial polymerization reaction is carried out by using p-phenylenediamine aqueous solution and trimesoyl chloride solution, the degree of polymerization of polyvinyl alcohol is 700, the degree of alcoholysis is 82%, and the crosslinking agent It is glyoxal, the acid catalyst is hydrochloric acid, the antioxidant substance is sodium thiosulfate, the heat treatment temperature is 65°C, and the time is 3min.

Embodiment 2

[0034] In this embodiment, the reverse osmosis membrane product is prepared by the above-mentioned method, wherein the interfacial polymerization reaction is carried out by using p-phenylenediamine aqueous solution and isophthaloyl chloride solution, the degree of polymerization of polyvinyl alcohol is 500, the degree of alcoholysis is 78%, and the cross-linking The agent is malondialdehyde, the acid catalyst is sulfuric acid, the antioxidant substance is sodium dithionite, and the heat treatment temperature is 50° C. and the time is 4 minutes.

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Abstract

The invention discloses an antioxidant reverse osmosis membrane and a preparation method thereof. The method comprises the following steps: step 1) carrying out interfacial polymerization reaction on a polyamine solution and a polyacyl chloride solution on a base layer to obtain a basic reverse osmosis membrane containing a polyamide desalination layer; and 2) coating the basic reverse osmosis membrane with a prepared anti-oxidation coating solution, and performing heat treatment to form a protective layer on the surface of the polyamide desalination layer, thereby obtaining the anti-oxidation reverse osmosis membrane. The anti-oxidation coating solution comprises polyvinyl alcohol, a cross-linking agent, an acid catalyst and an anti-oxidation substance; the polymerization degree of the polyvinyl alcohol is 500-2000, and the alcoholysis degree of the polyvinyl alcohol is 70-100%; the acid catalyst is hydrochloric acid, sulfuric acid, phosphoric acid or nitric acid; the antioxidant substance is at least one of sodium thiosulfate, sodium dithionite, sodium pyrosulfite, sodium hydrogen sulfite and sodium sulfite. The reverse osmosis membrane provided by the invention not only meets the requirements of relatively high desalination rate and water yield, but also has good oxidation resistance.

Description

technical field [0001] The invention relates to the technical field of polymer membrane separation, in particular to an anti-oxidation reverse osmosis membrane and a preparation method of the reverse osmosis membrane. Background technique [0002] With the acceleration of the industrialization process, the deterioration of water quality caused by the discharge of various types of wastewater has become increasingly prominent, so the demand for environmental pollution control has become increasingly urgent. At present, the realization of resource recycling of wastewater is gradually becoming a trend to solve this problem. With the continuous development of my country's membrane industry and the continuous improvement of membrane technology, reverse osmosis membrane products are widely used in metallurgy, chemical industry, papermaking, printing and dyeing, medicine, food and other fields, and have an advantageous position in wastewater reuse. However, the existing reverse osmo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/56B01D61/02
CPCB01D67/0006B01D67/0088B01D67/0083B01D69/02B01D71/56B01D61/025B01D2325/30B01D2325/48Y02A20/131
Inventor 贺攀路宏伟彭博胡群辉喻慧廖骞
Owner HUNAN OVAY TECH CO LTD
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