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A kind of preparation method of high flux low pressure reverse osmosis membrane

A low-pressure reverse osmosis, high-flux technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of high driving pressure, and achieve the effect of low driving pressure, high porosity and high flux

Active Publication Date: 2022-07-08
JIANGSU JIUWU HITECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned method still belongs to modifying the surface of the reverse osmosis membrane, and there is still the problem that the required driving pressure is too high

Method used

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  • A kind of preparation method of high flux low pressure reverse osmosis membrane
  • A kind of preparation method of high flux low pressure reverse osmosis membrane
  • A kind of preparation method of high flux low pressure reverse osmosis membrane

Examples

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Comparison scheme
Effect test

Embodiment 1

[0028] The first step, preparation of modified base membrane: in parts by weight, take polysulfone (weight average molecular weight is 1 × 10 5 ~1×10 6 ) 15 parts, 2 parts of polyhydroxypropyl dimethyl ammonium chloride, and 20 parts of N-methylpyrrolidone were mixed, and the temperature was raised to 50 ° C and mixed evenly, and then defoamed to obtain a casting solution; On a flat plate with a thickness of 200 μm, it was then immersed in deionized water of a coagulation bath at 40°C for phase separation to obtain a modified polysulfone membrane;

[0029] The second step, the preparation of the intermediate layer: in parts by weight, disperse 2 parts of nano-silica in 80 parts of ethanol, then dropwise add 1 part of p-hydroxybenzoic acid under nitrogen protection, react at 25 ° C for 6 hours, and then add the solid Centrifugal separation, washing with ethanol and deionized water, and freeze-drying to obtain modified silica nanoparticles; mixing modified silica nanoparticles,...

Embodiment 2

[0032] The first step, preparation of modified base membrane: in parts by weight, take polysulfone (weight average molecular weight is 1 × 10 5 ~1×10 6 ) 18 parts, 4 parts of polyhydroxypropyl dimethyl ammonium chloride, and 70 parts of N-methylpyrrolidone were mixed, and the temperature was raised to 80 ° C and mixed evenly, and then defoamed to obtain a casting liquid; On a flat plate, the thickness is 200 μm, and then immersed in deionized water in a coagulation bath at 80 °C for phase separation to obtain a modified polysulfone membrane;

[0033] The second step, the preparation of the intermediate layer: in parts by weight, disperse 5 parts of nano-silica in 90 parts of ethanol, then dropwise add 3 parts of p-hydroxybenzoic acid under nitrogen protection, react at 40 ° C for 10 hours, and then add the solid Centrifugal separation, washing with ethanol and deionized water, and freeze-drying to obtain modified silica nanoparticles; mixing modified silica nanoparticles, dis...

Embodiment 3

[0036] The first step, preparation of modified base membrane: in parts by weight, take polysulfone (weight average molecular weight is 1 × 10 5 ~1×10 6 ) 16 parts, 3 parts of polyhydroxypropyl dimethyl ammonium chloride, and 40 parts of N-methylpyrrolidone were mixed, the temperature was raised to 60 ° C and mixed evenly, and then defoamed to obtain a casting liquid; On a flat plate with a thickness of 200 μm, it was then immersed in deionized water of a coagulation bath at 65°C for phase separation to obtain a modified polysulfone membrane;

[0037] The second step, the preparation of the intermediate layer: in parts by weight, disperse 4 parts of nano-silica in 85 parts of ethanol, then add 2 parts of p-hydroxybenzoic acid dropwise under nitrogen protection, react at 35 ° C for 8 hours, and then add the solid Centrifugal separation, washing with ethanol and deionized water, and freeze-drying to obtain modified silica nanoparticles; mixing modified silica nanoparticles, disp...

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Abstract

The invention relates to a preparation method of a high-flux and low-pressure reverse osmosis membrane, and belongs to the technical field of separation membrane materials. In this method, a layer of nanoparticles is first constructed as an intermediate layer on the surface of the base film, and a transition layer with high porosity is constructed by the nanoparticles, and then a selective separation layer is prepared on the surface of the transition layer by the method of interfacial polymerization. With the high hydrophilicity and porosity of the nanoparticles, the permeation channel of water can be formed better, and the high-flux reverse osmosis process under the driving condition of low pressure can be realized.

Description

technical field [0001] The invention relates to a preparation method of a high-flux and low-pressure reverse osmosis membrane, and belongs to the technical field of separation membrane materials. Background technique [0002] As we all know, the reverse osmosis membrane requires high operating pressure and high operating cost, which limits the application of reverse osmosis technology. Nanofiltration membrane overcomes the disadvantage of high operating pressure of reverse osmosis membrane, but the desalination rate is low, so it cannot be used for desalination. Therefore, it is necessary to develop a separation membrane material that can achieve reverse osmosis separation performance under low pressure conditions. [0003] CN102553460A discloses a preparation method of a pollution-resistant low-pressure reverse osmosis membrane, which comprises preparing a polyamide membrane by using an aqueous polyamine solution and an organic solution of polybasic acid chloride on a poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/02
CPCB01D71/68B01D69/02B01D67/0011B01D61/025Y02A20/131
Inventor 彭文博秦泗光吴正雷白祖国曹恒霞王肖虎范克银
Owner JIANGSU JIUWU HITECH
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