Novel reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, a new type of technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as short service life, chlorine oxidation, flux and desalination rate limitations, etc.

Active Publication Date: 2018-08-28
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 ox

Method used

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

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 membrane disclosed by the invention comprises the steps of blade coating of a support layer, preparation of a function layer, preparation of a protection layer, etc. Through the means such as surface grafting modification, ultrasonic preparation of the function layer and mixed acid washing in aftertreatment, the problems of mutual restriction of flux and desalination rate and relatively short service life caused by pollution are overcome to a certain degree. The reverse osmosis membrane provided by the invention can realize a good effect in practical application.

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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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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