Preparation method of high performance seawater desalination reverse osmosis membrane

A reverse osmosis membrane and seawater desalination technology, applied in chemical instruments and methods, seawater treatment, semi-permeable membrane separation, etc., can solve the problems of membrane instability and achieve the effect of compact structure, uniform pore distribution and high stability

Active Publication Date: 2019-05-24
HUNAN KEENSEN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing diaphragm is unstable under high-pressure operation, and the use of polysulfone support layer to solve the problem of less research on the instability of the diaphragm under high-pressure operation proposes a formula prepared by The process is improved to produce a high-performance seawater desalination reverse osmosis membrane preparation method, and the produced reverse osmosis membrane can maintain stable performance under long-term operation

Method used

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Effect test

Embodiment 1

[0015] The preparation method of seawater desalination permeable membrane in the present embodiment is as follows:

[0016] 1) Preparation of polysulfone support layer: Weigh 16% polysulfone resin and dissolve it in N,N-dimethylformamide, stir at 70°C for 4 hours, and prepare a uniformly dispersed solution; the solution is filtered , After vacuum degassing, it is evenly coated on the non-woven fabric on a high-speed slit spraying machine, the wet film thickness is about 150 μm, and then immediately immersed in 18 ℃ pure water to gel and solidify into a film to obtain a polysulfone support layer;

[0017] 2) Configure an amine-containing aqueous phase solution: dissolve m-phenylenediamine in water, and its weight concentration in the aqueous solution is 3.5%. After it is completely dissolved, add surface activity that accounts for 1.5% by weight of the aqueous solution to the aqueous solution. After stirring evenly, add sodium hydroxide to adjust the pH value of the solution be...

Embodiment 2

[0021] The preparation method of seawater desalination permeable membrane in the present embodiment is as follows:

[0022] 1) Preparation of polysulfone support layer: Weigh 18% polysulfone resin and dissolve it in N,N-dimethylformamide, stir at 70°C for 4 hours, and prepare a uniformly dispersed solution; the solution is filtered , After vacuum degassing, it is evenly coated on the non-woven fabric on a high-speed slit spraying machine, the wet film thickness is about 150 μm, and then immediately immersed in 18 ℃ pure water to gel and solidify into a film to obtain a polysulfone support layer;

[0023] 2) Configure an amine-containing aqueous phase solution: dissolve m-phenylenediamine in water, and its weight concentration in the aqueous solution is 3.5%. After it is completely dissolved, add surface activity that accounts for 1.5% by weight of the aqueous solution to the aqueous solution. After stirring evenly, add sodium hydroxide to adjust the pH value of the solution be...

Embodiment 3

[0027] 1) Preparation of polysulfone support layer: Weigh 16% by weight of polysulfone resin and dissolve it in N,N-dimethylformamide, add 1.5% by weight of PVP-K30, and stir at 70°C for 4 hours , prepared into a uniformly dispersed solution; the solution was filtered and vacuum degassed, and then evenly coated on the non-woven fabric on a high-speed slit spraying machine, the wet film thickness was about 150μm, and then immediately immersed in 18°C ​​pure water to gel curing into a film to obtain a polysulfone support layer;

[0028] 2) Configure an amine-containing aqueous phase solution: dissolve m-phenylenediamine in water, and its weight concentration in the aqueous solution is 3.5%. After it is completely dissolved, add surface activity that accounts for 1.5% by weight of the aqueous solution to the aqueous solution. After stirring evenly, add sodium hydroxide to adjust the pH value of the solution between 9 and 10 to obtain an amine-containing solution;

[0029] 3) con...

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Abstract

The invention discloses a preparation method of a high performance seawater desalination reverse osmosis membrane. The method comprises the following steps of 1) preparing a polysulfone support layer,wherein a polysulfone resin having a weight ratio of 16%-18% is weighed and dissolved in n,n,-dimethyl formamide, an additive in a weight ratio of 1.5%-3.0% is added, stirring is conducted at 70 DEGC for 4 h, and a uniformly dispersed solution is prepared, the solution is filtered, vacuum-degassed and then evenly applied on a non-woven fabric through a high speed slit coating machine, the wet membrane thickness is about 150 micrometers, immediate immersing in 15-18 DEG C pure water is conducted, and a membrane is formed through gel solidification to obtain the polysulfone support layer; 2) preparing an amine-containing aqueous phase solution; 3) preparing an acid chloride oil phase solution; 4) preparing the seawater desalination membrane. The method studies the polysulfone support layerto make the formed polysulfone support layer have a compact structure and uniform pore distribution, so that the finally obtained membrane has better performance and higher stability under long-termhigh-pressure operation conditions.

Description

technical field [0001] The invention relates to the field of reverse osmosis membrane preparation, more specifically, to a preparation method of a high-performance seawater desalination reverse osmosis membrane. Background technique [0002] For a long time, the global shortage of freshwater resources has been a problem faced by human beings. Although seawater accounts for less than 99% of the world's total water resources, it cannot be directly used due to its large amount of inorganic salts. Seawater desalination technology has matured after more than half a century of development. The main desalination methods are: multi-stage flash (MSF) technology, low temperature multiple effect (LT-MDE) technology, reverse osmosis (RO-SW) technology, etc. Among them, the first two distillation methods have high energy consumption and gradually lose economic benefits. With the continuous improvement and improvement of reverse osmosis membrane technology, it has the advantages of low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D67/00C02F1/44C02F103/08
CPCY02A20/131
Inventor 曾浩浩龙昌宇余普韧石世业唐学军
Owner HUNAN KEENSEN TECH CO LTD
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