Antibacterial oxidation-resistant composite reverse osmosis membrane

A technology of reverse osmosis membrane and oxidation resistance, which is applied in the direction of semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., can solve the problems that restrict the popularization and application of polyamide composite reverse osmosis membrane, and achieve the improvement of antibacterial performance and oxidation resistance , good antibacterial and oxidation resistance, simple preparation method

Active Publication Date: 2012-06-27
徐州世恒环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These have seriously restricted the popularization and application of polyamide composite reverse osmosis membranes, especially in the fields of highly polluted water treatment, water reuse, and chemical separation.

Method used

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  • Antibacterial oxidation-resistant composite reverse osmosis membrane
  • Antibacterial oxidation-resistant composite reverse osmosis membrane
  • Antibacterial oxidation-resistant composite reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation of porous supporting membrane: prepare by conventional method, the present invention is to dissolve in the polar organic solvent with the UDEL PS3500LCD polysulfone of 13.0wt%, the water of 0.3wt% and the tensio-active agent of 0.1wt%, be coated with scraping on polyester After immersing in water to remove solvents and additives, a porous support membrane with a molecular weight cut off (MWCO) of about 80,000 is obtained. Wherein, the surfactant includes at least one of alkylphenol polyoxyethyl ester phosphate, sodium dodecyl sulfonate and alkylphenol polyoxyethyl ester phosphate; the polar organic solvent is N,N-dimethyl Acetamide, or N,N-dimethylformamide, or N-methylpyrrolidone, or a mixture thereof.

[0034] Preparation of polyamide polymer desalination layer: immerse one side of the wet polysulfone support membrane into the polyamine solution, roll the surface of the support membrane with a rubber roller and squeeze it dry, then contact with the pol...

Embodiment 5-8

[0060] Composite reverse osmosis membranes containing different desalination layer materials are prepared by using the existing technology, and then the desalination layer materials are processed in the following three steps in sequence:

[0061] (1) Soak the polymer desalting layer in a solution with a formaldehyde concentration of 5.0 wt %, a pH of 10.0, and a temperature of 60°C for 60 minutes, take it out and wash it with pure water.

[0062] (2) Soak the polymer desalination layer treated above at a pH of 3.0, a temperature of 60° C., and contain 5.0 wt % of hydroxymethylhydantoin in the solution for 30 minutes, and keep it in an oven at 120 degrees for 5 minutes after taking it out. minute.

[0063] (3) Soak the above-treated polymer desalination layer in a solution with an active chlorine concentration of 0.5 wt% and a temperature of 20° C. for 100 minutes, take it out and wash it with pure water.

[0064] The separation performance, antibacterial performance and chlor...

Embodiment 9-14

[0069] The composite reverse osmosis membrane was prepared by the same preparation method as in Example 5 except that the soaking treatment process in the first step was different. The separation performance, antibacterial performance and chlorine resistance performance of the prepared composite reverse osmosis membrane are shown in Table 3.

[0070] Table 3: Examples 9-14

[0071]

[0072]

[0073] The above examples show that the antibacterial and oxidation resistance of the composite reverse osmosis membrane can be improved by soaking the polyamide composite reverse osmosis membrane with formaldehyde solutions of different concentrations, or different pHs, or different temperatures for different times.

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Abstract

The invention relates to a high-molecular composite membrane, in particular to an antibacterial oxidation-resistant composite reverse osmosis membrane for water treatment. The antibacterial oxidation-resistant composite reverse osmosis membrane comprises a non-woven fabric layer, a porous supporting layer and a polyamide polymer desalination layer on the porous supporting layer, and is characterized by being prepared by the following steps of: (1) soaking the polyamide polymer desalination layer in a formaldehyde solution, taking out the polyamide polymer desalination layer and washing with purified water; (2) soaking the polyamide polymer desalination layer in a solution containing hydroxymethyl hydantoin or hydroxymethyl ethyleneurea or hydroxymethyl oxazolidine, and then drying; and (3) soaking the treated polyamide polymer desalination layer in a solution containing active chlorine, taking out and then washing with the purified water to obtain the antibacterial oxidation-resistant composite reverse osmosis membrane. The antibacterial oxidation-resistant composite reverse osmosis membrane disclosed by the invention further has the characteristics of easy preparation, high desalination rate and large water flux, and also has wide application.

Description

technical field [0001] The invention belongs to a polymer composite membrane in the field of water treatment, and specifically refers to a conventional composite reverse osmosis membrane with better antibacterial and oxidation resistance after post-treatment. technical background [0002] Reverse osmosis technology is a new green separation technology with high efficiency and energy saving. It has the outstanding characteristics of simple equipment, mild operating conditions, large processing capacity and high separation efficiency. Separation, environmental engineering, food, medicine and other fields have been widely used, and have achieved good economic and social benefits; in recent years, with the increasing shortage of global water resources and increasing water pollution, reverse osmosis technology has The field of water reuse has been more widely used and valued. [0003] The polyamide composite reverse osmosis membrane is currently the most widely used reverse osmo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/40
Inventor 俞三传刘梅红
Owner 徐州世恒环保科技有限公司
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