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A novel reverse osmosis membrane and its preparation method

A reverse osmosis membrane, a new type of technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems affecting the appearance of reverse osmosis membrane, membrane surface pollution, easy oxidation and discoloration, etc., to improve water flux and rejection rate, overcoming the mutual limitation of flux and rejection rate

Active Publication Date: 2021-04-27
重庆海通环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other reverse osmosis membranes, polyamide reverse osmosis composite membranes have obvious advantages, but they still face three problems: the mutually restrictive relationship between flux and salt ion rejection, membrane surface contamination and chlorine oxidation.
Unreacted monomers, especially arylamines, are easy to oxidize and change color, which not only affects the appearance of the reverse osmosis membrane, but also has a certain impact on the separation performance of the membrane
[0012] The purpose of the present invention is to overcome the mutual limitation of flux and desalination rate and the short service life due to pollution in the prior art

Method used

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  • A novel reverse osmosis membrane and its preparation method
  • A novel reverse osmosis membrane and its preparation method
  • A novel reverse osmosis membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] (1) Configuration solution 1: add to the stirrer and account for each component of following mass fraction: the dimethyl sulfoxide of 75%, the polyaryl sulfone of 20% and the ethylene glycol of 5%, under the vacuum of 10mbar Stir at a speed of 200r / min for 24 hours to obtain solution 1;

[0109] (2) Scrape coating support layer: cast solution 1 on the surface of the non-woven fabric, scrape off the solution layer on both sides of the non-woven fabric with a scraper, and then form a support on the surface of the non-woven fabric through gel phase inversion in a 10°C cold water bath layer, and then formed by pretreatment with hot water at 90°C to form a support layer with a thickness of 120 μm to obtain a film containing the support layer;

[0110] (3) Configure solution 2: add water and triethylamine to the agitator, stir evenly at a speed of 200r / min, then add m-phenylenediamine, continue stirring at the original speed until completely dissolved, and obtain solution 2; ...

Embodiment 2

[0119] (1) Configuration solution 1: add to the stirrer and account for each component of following mass fraction: the dimethyl sulfoxide of 75%, the polyaryl sulfone of 20% and the ethylene glycol of 5%, under the vacuum of 10mbar Stirring at a speed of 200r / min and vacuum stirring for 24 hours to obtain solution 1;

[0120] (2) Scrape coating support layer: cast solution 1 on the surface of the non-woven fabric, scrape off the solution layer on both sides of the non-woven fabric with a scraper, and then form a support on the surface of the non-woven fabric through gel phase inversion in a 10°C cold water bath layer, and then formed by pretreatment with hot water at 90°C to form a support layer with a thickness of 120 μm to obtain a film containing the support layer;

[0121] (3) Configure solution 2: add water and triethylamine to the agitator, stir evenly at a speed of 200r / min, then add m-phenylenediamine, continue stirring at the original speed until completely dissolved,...

Embodiment 3

[0130] (1) Configuration solution 1: add to the stirrer and account for each component of following mass fraction: the dimethyl sulfoxide of 75%, the polyaryl sulfone of 20% and the ethylene glycol of 5%, under the vacuum of 10mbar Stirring at a speed of 200r / min and vacuum stirring for 24 hours to obtain solution 1;

[0131] (2) Scrape coating support layer: cast solution 1 on the surface of the non-woven fabric, scrape off the solution layer on both sides of the non-woven fabric with a scraper, and then form a support on the surface of the non-woven fabric through gel phase inversion in a 10°C cold water bath layer, and then formed by pretreatment with hot water at 90°C to form a support layer with a thickness of 120 μm to obtain a film containing the support layer;

[0132] (3) Configure solution 2: add water and triethylamine to the agitator, stir evenly at a speed of 200r / min, then add m-phenylenediamine, continue to stir at the original speed until completely dissolved, ...

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Abstract

The invention discloses a novel reverse osmosis membrane and a preparation method thereof. The preparation method of the film in the present invention includes the steps of scraping a support layer, preparing a functional layer, preparing a protective layer and the like. The present invention overcomes the mutual limitation of flux and desalination rate and the problem of short service life due to pollution to a certain extent through methods such as surface graft modification, ultrasonic preparation of functional layers, and mixed acid washing in post-treatment. The reverse osmosis membrane provided by the invention can achieve good results in practical applications.

Description

technical field [0001] The invention relates to a reverse osmosis membrane and a preparation method thereof. Background technique [0002] Seawater desalination methods mainly include thermal method and membrane method (reverse osmosis). Among them, the reverse osmosis membrane method has continuously expanded its application scale due to its advantages of low energy consumption and easy operation, and has surpassed thermal method to become the main technology for seawater desalination. [0003] Among them, polyamide reverse osmosis composite membrane has become the mainstream application membrane for seawater desalination by reverse osmosis membrane method due to its excellent separation performance. The polyamide reverse osmosis composite membrane generally consists of three layers: an ultra-thin (<200nm) polyamide active layer; a porous polysulfone (PSF) support layer (about 40 μm) and a non-woven (PET) mechanical support layer. The dense polyamide surface active lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/02B01D67/00B01D61/02
CPCB01D61/025B01D67/0006B01D69/02B01D71/38B01D2325/36Y02A20/131
Inventor 喻燕
Owner 重庆海通环保科技有限公司
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