A high desalination polyamide composite reverse osmosis membrane for seawater desalination and its preparation method

A high desalination polyamide, reverse osmosis membrane technology, applied in chemical instruments and methods, reverse osmosis, seawater treatment, etc., to achieve the effect of complete reaction, reduce defects, and improve desalination rate

Active Publication Date: 2022-04-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these are used in nanofiltration membrane (NF) modification, not used in reverse osmosis (RO) membrane, and only the influence of a single substance

Method used

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  • A high desalination polyamide composite reverse osmosis membrane for seawater desalination and its preparation method
  • A high desalination polyamide composite reverse osmosis membrane for seawater desalination and its preparation method
  • A high desalination polyamide composite reverse osmosis membrane for seawater desalination and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] After fully dissolving 4g of camphorsulfonic acid and 2g of m-phenylenediamine in 98ml of deionized water in turn, finally adjust the pH value with 2g of triethylamine. Pour this solution into the upper surface of the polysulfone porous support layer prepared in advance for 5 minutes, pour off the excess solution, and place it under the ultra-clean workbench for 6 minutes to wait for it to dry in the shade; then add 0.15g of trimesoyl chloride 100ml of Isopar The G solution was poured into the interfacial polymerization, and placed under the ultra-clean workbench for 10 minutes to wait for it to dry in the shade, and then placed in a blast drying oven at 80°C for 10 minutes to obtain a polyamide composite reverse osmosis membrane, which was designated as the M0 membrane.

example 2

[0028] Put 0.05g of sodium dodecyl sulfate (SDS) in 98ml of deionized water first, wait for it to be fully dissolved, then fully dissolve 4g of camphorsulfonic acid and 2g of m-phenylenediamine in turn, and finally use 2g of triethylamine to adjust pH value. Pour this solution into the upper surface of the polysulfone porous support layer prepared in advance for 5 minutes, pour off the excess solution, and place it under the ultra-clean workbench for 6 minutes to wait for it to dry in the shade; then add 0.15g of trimesoyl chloride 100ml of Isopar The G solution was poured into the interfacial polymerization, and placed under the ultra-clean workbench for 10 minutes to wait for it to dry in the shade, and then placed in an 80°C blast drying oven for 10 minutes to obtain a polyamide composite reverse osmosis membrane, which was designated as M1 membrane.

example 3

[0030] Put 0.05g of Pluronic F-127 (PF127) in 98ml of deionized water first, wait for it to be fully dissolved, then fully dissolve 4g of camphorsulfonic acid and 2g of m-phenylenediamine in turn, and finally adjust the pH value with 2g of triethylamine . Pour this solution into the upper surface of the polysulfone porous support layer prepared in advance for 5 minutes, pour off the excess solution, and place it under the ultra-clean workbench for 6 minutes to wait for it to dry in the shade; then add 0.15g of trimesoyl chloride 100ml of Isopar The G solution was poured into the interfacial polymerization, and placed under the ultra-clean workbench for 10 minutes to wait for it to dry in the shade, and then placed in an 80°C blast drying oven for 10 minutes to obtain a polyamide composite reverse osmosis membrane, which was designated as the M2 membrane.

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Abstract

The invention provides a high desalination polyamide composite reverse osmosis membrane for seawater desalination and a preparation method thereof. By adjusting the ratio between Pluronic F127 and sodium lauryl sulfate, a three-dimensional network micellar structure is formed, and then Add diamine monomer to prepare water phase solution. Since the micelle network structure has the function of surfactant, it will remain in the outermost layer of the aqueous solution and play a role in regulating the migration behavior of the diamine monomer in the aqueous phase. The mixed micelles of the present invention are easy to prepare, and can significantly affect the diffusion of diamine monomers in the water phase, thereby adjusting the structure of nodules and protrusions on the surface of the membrane, so that the surface structure of the reverse osmosis membrane is more uniform and more Smooth, thereby reducing the defects on the surface of the membrane. Under the feed liquid of 32000ppm NaCl, the desalination rate of the membrane is above 99.5%, and the water flux is only slightly reduced. The invention provides a new method for preparing a high desalination polyamide reverse osmosis membrane with complete structure and few defects, and provides a new idea for the regulation and control of the polyamide membrane production process.

Description

technical field [0001] The invention relates to a preparation method of a high desalination composite polyamide reverse osmosis membrane. Background technique [0002] According to the report of the United Nations, by 2025, about 5.2 billion people in the world will not have safe drinking water and 1.8 billion people will face severe water shortage problems. Seawater accounts for 96.53% of the earth's total water volume. Desalination of seawater is one of the effective means to supplement water supply. Membrane seawater desalination has become the mainstream method in the field of seawater desalination due to its high water production efficiency. At present, reverse osmosis seawater desalination technology is one of the best means to solve the growing demand for clean water production. However, the separation performance of seawater desalination reverse osmosis (RO) membrane needs to be further improved to reduce the cost of water production, but there is a "trade-off" effe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/02B01D71/56B01D61/02B01D67/00C02F1/44C02F103/08
CPCB01D69/125B01D69/02B01D71/56B01D61/025B01D67/0002C02F1/441B01D2325/36C02F2103/08Y02A20/131
Inventor 刘立芬李洋潘杰峰赵雪婷
Owner ZHEJIANG UNIV OF TECH
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