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Preparation method of modified reverse osmosis membrane

A reverse osmosis membrane and modification technology, applied in reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve problems such as membrane pore clogging and membrane performance degradation, and achieve low manufacturing cost, simple production process, cut-off Effect of high salt rate

Inactive Publication Date: 2020-04-14
TIANJIN LONGYUAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the desalination layer of the reverse osmosis membrane is working, the organic molecules, inorganic ions, colloids and microorganisms in the sewage will have a series of reactions with the membrane surface, resulting in the clogging of the membrane pores and the decline of the membrane performance.

Method used

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  • Preparation method of modified reverse osmosis membrane
  • Preparation method of modified reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Add 1.5wt.% organic monolithic montmorillonite, 5wt.% PEO, and 18wt.% polyethersulfone to N-methylpyrrolidone, dissolve and let stand for defoaming to obtain casting solution; Apply the prepared casting solution on the non-woven fabric, immerse in water for coagulation bath after scraping the film, and prepare the reverse osmosis membrane base membrane by dipping-precipitation phase inversion method; take the base membrane and dry it vertically in the shade, and coat the surface with 2wt .% m-phenylenediamine solution, after vertical drying, then coated with 0.08wt.% trimesoyl chloride solution for interfacial polymerization reaction, poured out the solution and dried it in a 60°C oven for 10 minutes to prepare a reverse osmosis membrane; Add 0.05w / v.%SDS to the MES buffer solution as a surfactant, TEA as an acid-binding agent, adjust the pH of the solution to 4.0 with HCl, soak the prepared reverse osmosis membrane in the solution for 5h; use deionized water After rins...

Embodiment 2

[0029] Add 4.5wt.% organic monolithic montmorillonite, 5wt.% PEO, and 18wt.% polyethersulfone to N-methylpyrrolidone, dissolve and let stand for defoaming to obtain casting solution; use automatic coating Apply the prepared casting solution on the non-woven fabric, immerse in water for coagulation bath after scraping the film, and prepare the reverse osmosis membrane base membrane by dipping-precipitation phase inversion method; take the base membrane and dry it vertically in the shade, and coat the surface with 2wt .% m-phenylenediamine solution, after vertical drying, then coated with 0.08wt.% trimesoyl chloride solution for interfacial polymerization reaction, poured out the solution and dried it in a 60°C oven for 10 minutes to prepare a reverse osmosis membrane; Add 0.05w / v.%SDS to the MES buffer solution as a surfactant, TEA as an acid-binding agent, adjust the pH of the solution to 4.0 with HCl, soak the prepared reverse osmosis membrane in the solution for 5h; use deion...

Embodiment 3

[0031] Add 1.5wt.% organic monolithic montmorillonite, 5wt.% PEO, and 20wt.% polysulfone to N-methylpyrrolidone, dissolve and let stand for defoaming to obtain casting solution; use an automatic film applicator The prepared casting solution was applied to the non-woven fabric, and after scraping the film, it was immersed in water for coagulation bath, and the reverse osmosis membrane base film was obtained by the dipping-precipitation phase inversion method; after the base film was dried vertically in the shade, the surface was coated with 2wt. % m-phenylenediamine solution, dried in the shade vertically, and then coated with 0.08wt.% trimesoyl chloride solution for interfacial polymerization reaction, poured out the solution and dried it in a 60°C oven for 10 minutes to prepare a reverse osmosis membrane; Add 0.05w / v.% SDS to the buffer solution as a surfactant, TEA as an acid-binding agent, adjust the pH of the solution to 4.0 with HCl, soak the prepared reverse osmosis membr...

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Abstract

The invention relates to a nano-clay particle doped and small molecule in-situ grafted modified reverse osmosis membrane. The preparation method comprises: adding nano-clay particles, a pore-foaming agent and a polymer into N-methyl pyrrolidone, mixing to obtain a membrane casting solution, and preparing a reverse osmosis membrane base membrane by an impregnation-precipitation phase inversion method; coating the surface of the base membrane with a water-phase solution and an oil-phase solution, and carrying out interfacial polymerization to obtain a reverse osmosis membrane; and grafting smallmolecules on the surface of the reverse osmosis membrane in situ to obtain a modified reverse osmosis membrane. According to the invention, the reverse osmosis membrane prepared by the method has excellent pollution resistance, salt rejection rate and mechanical strength while the water flux is ensured, the service life is prolonged, the performance attenuation rate is reduced, the additive is low in price and easy to obtain, and the method is suitable for commercial production.

Description

technical field [0001] The invention relates to a method for preparing a modified reverse osmosis membrane, in particular to a method for preparing a reverse osmosis membrane by mixing nano-clay particles and in-situ grafting and modifying small molecules, and belongs to the field of separation membrane manufacturing. Background technique [0002] The shortage of fresh water resources is one of the major problems facing mankind at present. When membrane separation technology is used for water treatment, it has the advantages of low operating cost, low energy consumption, and high desalination rate. Reverse osmosis membranes are widely used in seawater desalination and waste liquid recovery, creating huge economic benefits. However, because the membrane material is easily polluted, the desalination rate and water flux of the reverse osmosis membrane are greatly reduced with use, and the frequency of chemical cleaning increases, which increases the operating cost of the revers...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/34B01D71/68
CPCB01D61/025B01D67/0002B01D69/02B01D71/34B01D71/68B01D2325/36
Inventor 王薇王晶蔡相宇于湉陈静
Owner TIANJIN LONGYUAN NEW MATERIAL TECH CO LTD
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