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PVA-based polyion composite membrane for industrial concentrated salt sewage treatment and preparation method thereof

A sewage treatment and polyion technology, applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc., can solve the problem of small water flux, low salt rejection rate and flux, and hydrothermal stability of molecular sieve inorganic membranes Insufficient performance and other problems, to achieve the effect of improving water flux, large permeation flux, and ensuring stability

Active Publication Date: 2020-11-13
江苏微能电子科技有限公司
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  • Abstract
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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a PVA-based polyion composite membrane for industrial concentrated salt sewage treatment and a preparation method thereof, which solves the problems of low hydrothermal stability and salt interception in the treatment of high-salt wastewater with PVA organic membranes. Low rate and flux, low water flux of molecular sieve inorganic membrane, complex preparation process, etc.

Method used

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  • PVA-based polyion composite membrane for industrial concentrated salt sewage treatment and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] Embodiment 1 is used for the preparation of the PVA-based polyion composite membrane I of industrial concentrated salt sewage treatment

[0024] Step 1, the preparation of polyquaternium cationic PVA: the KOH solution that mass concentration is 5mol / L is stirred dropwise to PVA aqueous solution alkalization, then adds (3-chloro-2-hydroxymethyl) trimethyl ammonium chloride , the mass volume ratio of (3-chloro-2-hydroxymethyl)trimethylammonium chloride, KOH solution and PVA aqueous solution is 0.5g: 1ml: 100ml, stirring and reacting at 60-85°C for 1-3h, After the reaction, adding mass fraction is 95% ethanol, separating the precipitate, separating, washing and drying the precipitate to obtain polyquaternium cationic PVA with a degree of substitution of 2.5;

[0025] Preparation of polysulfonic acid group-substituted anion PVA: Stir and drop concentrated sulfuric acid into PVA aqueous solution, wherein the mass volume ratio of concentrated sulfuric acid to PVA aqueous solu...

Embodiment 2

[0030] Example 2 Preparation of PVA-based Polyion Composite Membrane II for Industrial Concentrated Salt Wastewater Treatment

[0031] Step 1, the preparation of polyquaternium cationic PVA: the KOH solution that mass concentration is 10mol / L is stirred dropwise to PVA aqueous solution alkalization, then adds (3-chloro-2-hydroxymethyl) trimethyl ammonium chloride , the mass volume ratio of (3-chloro-2-hydroxymethyl)trimethylammonium chloride, KOH solution and PVA aqueous solution is 5g: 10ml: 100ml, stirred and reacted at 60-85°C for 1-3h, and reacted After finishing, adding mass fraction is 95% ethanol, separates precipitate, separates, washes, dries the precipitate, obtains the polyquaternium cationic PVA that substitution degree is 7;

[0032] Preparation of polysulfonic acid group-substituted anion PVA: Stir and drop concentrated sulfuric acid into PVA aqueous solution, wherein the mass volume ratio of concentrated sulfuric acid to PVA aqueous solution is 3g: 100ml, stir a...

Embodiment 3

[0037] Example 3 Preparation of PVA-based Polyion Composite Membrane III for Industrial Concentrated Salt Wastewater Treatment

[0038] Step 1, the preparation of polyquaternium cationic PVA: the KOH solution that mass concentration is 6.5mol / L is stirred dropwise to PVA aqueous solution alkalization, then adds (3-chloro-2-hydroxymethyl) trimethyl chloride Ammonium, the mass volume ratio of (3-chloro-2-hydroxymethyl)trimethylammonium chloride, KOH solution and PVA aqueous solution is 1.5g: 4ml: 100ml, stirring and reacting at 60-85°C for 1-3h , after the reaction is finished, add mass fraction and be 95% ethanol, isolate precipitate, separate, wash, dry by precipitate, obtain the degree of substitution and be the polyquaternium cationic PVA of 3.5;

[0039] Preparation of polysulfonic acid group-substituted anion PVA: Stir and drop concentrated sulfuric acid into PVA aqueous solution, wherein the mass volume ratio of concentrated sulfuric acid to PVA aqueous solution is 1.5g: ...

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Abstract

The invention discloses a PVA (polyvinyl alcohol)-based polyion composite film for treatment of industrial concentrated salt sewage. The PVA-based polyion composite film is prepared by polymerizing aself-assembly type PVA base film and aminated mesoporous SiO2 (silicon dioxide) through an interface, wherein the self-assembly type PVA base film is assembled by polyquaternary ammonium salt anion PVA and polysulfonic group-substituted cation PVA according to a mass ratio of 1:(0.6 to 1.3). Compared with the prior art, the PVA-based polyion composite film has the advantages that the self-assemblytype PVA base film has stronger adsorption ability on the substances with strong polarity in the separating system, the liquid mixture with different polarity can be separated out, and the cations and anions are crosslinked to form a network structure, so as to favorably perform the permeating process; because the polyanions and the polycations are water-soluble, the film can be formed by a one-time coating method; the aminated mesoporous SiO2 can furthest increase the water flux under the condition of high salt blocking rate, and the introduced hydrophilic amino group can generate reaction with groups in the base film and then be firmly bonded together with the base film by chemical bonds, so as to ensure the stability of the composite film and the safety and purity of the separating system, and prolong the service life of the composite film.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a PVA-based polyion composite membrane used for industrial concentrated salt sewage treatment and a preparation method thereof. Background technique [0002] Chemical, printing and dyeing, medicine, food and many other industrial productions will produce a large amount of high-salt wastewater, and the discharge of such wastewater will cause serious pollution to the environment. Therefore, how to deal with high-salt wastewater has become a hot research topic. At present, the treatment of high-salt wastewater mainly adopts thermal concentration process, such as multiple effect evaporation. The principle of this process is to concentrate high-salt wastewater with heat energy to obtain concentrated water and clean water. This process consumes a lot of energy and usually needs to be used in large concentration equipment. The equipment is complex and occupies a large ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/12B01D69/02B01D67/00C02F1/44
CPCB01D67/0006B01D69/02B01D69/12B01D71/38B01D2325/36C02F1/44
Inventor 孙志锐
Owner 江苏微能电子科技有限公司
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