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High-flux low-pressure composite reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane and high-flux technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of decreased desalination rate of low-pressure reverse osmosis membrane, increase flux of low-pressure reverse osmosis membrane, and poor desalination layer Resistance to pressure scouring and other issues, to achieve the effect of improving hydrophilicity, improving channel hydrophilicity, and increasing water production

Inactive Publication Date: 2020-02-21
恩泰环保科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has the following disadvantages: 1. The thinner desalination layer will cause a serious decline in the desalination rate of the low-pressure reverse osmosis membrane, which cannot meet the water quality requirements. At the same time, the thin desalination layer is not resistant to pressure erosion, and the service life will be greatly reduced; 2. The introduction of nanomaterials has the disadvantages of easy agglomeration and precipitation, and unstable fixation in the desalination layer, which cannot effectively improve the flux of low-pressure reverse osmosis membranes in large-scale industrialization

Method used

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  • High-flux low-pressure composite reverse osmosis membrane and preparation method thereof
  • High-flux low-pressure composite reverse osmosis membrane and preparation method thereof
  • High-flux low-pressure composite reverse osmosis membrane and preparation method thereof

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Embodiment 1

[0029] A method for preparing a high-throughput low-pressure composite reverse osmosis membrane, comprising the steps of:

[0030] (1) Mix and dissolve 40g citric acid and 20g triethylamine evenly as a two-phase organic buffer, then add 20g m-phenylenediamine and 20g water phase modifier N,N dimethylformamide, deionized water Dilute to 1000g, stir evenly to obtain m-phenylenediamine aqueous phase solution, set aside;

[0031] (2) Dissolve 1g of trimesoyl chloride in an organic solvent, stir until evenly mixed, then add 1g of oil phase modifier isopropanol, add an organic solvent to dilute to 500g, stir and dissolve to obtain an organic oil phase of trimesoyl chloride Solution; Described organic solvent is that Isopar G and hexanaphthene are mixed by volume ratio 7:3;

[0032] (3) Cut the porous supporting layer of corresponding size, first soak in the m-phenylenediamine aqueous phase solution obtained in step (1) for 0.5-1min, drain the surface water drops, then soak in the h...

Embodiment 2～5

[0034] A preparation method of a high-flux low-pressure composite reverse osmosis membrane is basically the same as in Example 1, the differences are as shown in Table 1:

[0035] Table 1

[0036]

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Abstract

Belonging to the technical field of reverse osmosis membranes, the invention particularly relates to a high-flux low-pressure composite reverse osmosis membrane and a preparation method thereof. The preparation method includes: (1) mixing citric acid and triethylamine uniformly, and adding m-phenylenediamine and a water-phase modifier to obtain a m-phenylenediamine water-phase solution; (2) dissolving trimesoyl chloride in an organic solvent, and then adding an oil phase modifier to obtain a trimesoyl chloride oil-phase solution; and (3) soaking a porous support layer in the m-phenylenediaminewater-phase solution for 0.5-1min, then performing soaking in the trimesoyl chloride oil-phase solution for 0.5-1min, and conducting drying to obtain the high-flux low-pressure composite reverse osmosis membrane. According to the invention, the modifiers are introduced into the m-phenylenediamine water-phase solution and the trimesoyl chloride oil-phase solution at the same time to enhance the water flux of the low-pressure composite reverse osmosis membrane, and the low-pressure composite reverse osmosis membrane also has a high desalination rate.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membranes, in particular to a high-flux low-pressure composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] As an indispensable resource for human beings, water resources play a vital role in human daily life and production activities. On the one hand, with the intensification of the industrialization process worldwide, the pollution of water resources is becoming more and more serious, and the volume of polluted water is increasing year by year. On the other hand, with the rapid development of the human economy and population, the protection of the existing fresh water resources is neglected, which eventually leads to the fact that the existing fresh water resources are far from meeting the needs of the development of human society. The recycling of water resources purification will be an effective means to solve the current shortage of water r...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D61/08B01D67/00B01D69/02
CPCB01D61/08B01D67/0006B01D69/02B01D71/56Y02A20/131
Inventor 周兴蒙刘涛向豪周子杰单连杰
Owner 恩泰环保科技(常州)有限公司
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