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Reverse osmosis membrane, and preparation method and application thereof

A technology of reverse osmosis membrane and support membrane, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem that it is difficult to ensure the desalination rate and water flux of reverse osmosis membrane, and the reduction of water flux of reverse osmosis membrane, etc. problems, to achieve the effect of increasing water flux, high water flux, and improving desalination rate

Active Publication Date: 2021-08-13
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In some water treatment devices that require desalination, such as seawater desalination devices, in order to improve the desalination rate of reverse osmosis membranes, when preparing reverse osmosis membranes, multiple coatings are generally carried out on the surface of the dense layer. If the thickness of the dense layer is increased, the water flux of the reverse osmosis membrane will be greatly reduced, and it is difficult to ensure that the reverse osmosis membrane has a high desalination rate and water flux at the same time.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0023] The preparation method of the reverse osmosis membrane provided by the invention comprises the following steps:

[0024] S10, providing a support film, and forming a polyamide layer on the surface of the support film, wherein the polyamide layer includes acid halide groups; and

[0025] S20, providing a mixed solution, the mixed solution includes polyamines, polar small molecule solvents and hydrophilic polymers, the mixed solution is placed on the surface of the polyamide layer away from the support membrane and heat-treated to make the acid halide in the polyamide layer The group reacts with the polyamine in the mixed solution, and the polyamide layer becomes a dense layer to obtain a reverse osmosis membrane.

[0026] Among them, the mass fraction of the polar small molecule solvent in the mixed solution is greater than or equal to 50%, the mass fraction of the hydrophilic polymer in the mixed solution is less than or equal to 1%, and the structure of the dense layer...

Embodiment 1

[0054] Based on the total weight of the aqueous phase solution, 2.0% by weight of m-phenylenediamine and 0.2% by weight of triethylamine were added to 97.8% by weight of water, and mixed uniformly to obtain an aqueous phase solution.

[0055] Based on the total weight of the oil phase solution, 0.25% by weight of trimesoyl chloride was added to 99.75% by weight of isododecane, and mixed uniformly to obtain an oil phase solution.

[0056] Coat the above-mentioned water phase solution on the surface of the polysulfone support membrane, pour off the excess water phase solution after standing for 60 seconds, and dry it with cold wind; then coat the above-mentioned oil phase solution on the surface of the dried polysulfone support membrane, After standing still for 30 seconds, the excess oil phase solution was poured off, and the obtained membrane was heat-treated at 80° C. for 2 minutes in a blast drying oven to obtain a polyamide layer with a thickness of 150 nm.

[0057] Based o...

Embodiment 2

[0061] Based on the total weight of the aqueous phase solution, 2.5% by weight of m-phenylenediamine and 0.2% by weight of triethylamine were added to 97.3% by weight of water, and mixed uniformly to obtain an aqueous phase solution.

[0062] Based on the total weight of the oil phase solution, 0.3% by weight of trimesoyl chloride was added to 99.7% by weight of isododecane, and mixed uniformly to obtain an oil phase solution.

[0063] Coat the above-mentioned water phase solution on the surface of the polysulfone support membrane, pour off the excess water phase solution after standing for 60 seconds, and dry it with cold wind; then coat the above-mentioned oil phase solution on the surface of the dried polysulfone support membrane, After standing still for 30 seconds, the excess oil phase solution was poured off, and the obtained membrane was heat-treated at 80° C. for 2 minutes in a blast drying oven to obtain a polyamide layer with a thickness of 210 nm.

[0064] Based on ...

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Abstract

The invention relates to a reverse osmosis membrane, and a preparation method and application thereof. The preparation method of the reverse osmosis membrane comprises the following steps: providing a supporting membrane, and forming a polyamide layer on the surface of the supporting membrane, wherein the polyamide layer comprises acyl halide groups; and providing a mixed solution which comprises polyamine, a polar small molecule solvent and a hydrophilic polymer, placing the mixed solution on the surface, far away from the supporting membrane, of the polyamide layer, and performing heat treatment to make the acyl halide groups in the polyamide layer react with the polyamine in the mixed solution and the polyamide layer become a compact layer, so as to obtain the reverse osmosis membrane, wherein the mass fraction of the polar small molecule solvent in the mixed solution is greater than or equal to 50%, the mass fraction of the hydrophilic polymer in the mixed solution is less than or equal to 1%, and the compact layer further comprises the hydrophilic polymer. The reverse osmosis membrane prepared by the preparation method of the reverse osmosis membrane has high desalination rate and water flux, and can be better applied to a water treatment device.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a reverse osmosis membrane and its preparation method and application. Background technique [0002] In some water treatment devices that require desalination, such as seawater desalination devices, in order to improve the desalination rate of reverse osmosis membranes, when preparing reverse osmosis membranes, multiple coatings are generally carried out on the surface of the dense layer. If the thickness of the dense layer is increased, the water flux of the reverse osmosis membrane will be greatly reduced, and it is difficult to ensure that the reverse osmosis membrane has a high salt rejection rate and water flux at the same time. Contents of the invention [0003] Based on this, it is necessary to provide a reverse osmosis membrane and its preparation method and application for the above problems; the reverse osmosis membrane obtained by the preparation method has h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D61/02B01D71/56C02F1/44C02F103/08
CPCB01D61/025B01D67/0006B01D69/02B01D69/105B01D71/56C02F1/441C02F2103/08Y02A20/131
Inventor 陈可可刘文超谭惠芬洪勇琦郑宏林潘巧明徐子丹
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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