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Preparation method of high-performance composite membrane used for water treatment

A composite membrane, high-performance technology, applied in the direction of osmosis/dialysis water/sewage treatment, chemical instruments and methods, membrane technology, etc., can solve the problem without considering the influence of phenolic antioxidant flux and retention rate, without considering chlorine resistance Sexuality, antibacterial and other issues, to achieve long-term stable hydrophilicity, excellent antibacterial effect

Active Publication Date: 2015-12-23
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent document CN104587845 introduces a composite membrane with a hydrophilic separation layer. The separation layer is prepared on the porous support membrane by interfacial polymerization. amine, the prepared separation layer has long-term stable hydrophilicity, and can be used in processes such as nanofiltration, reverse osmosis, pervaporation, and forward osmosis, but the nanofiltration membrane prepared by this method does not consider the presence of ether oxygen groups in the separation layer. Introducing the effect on membrane chlorine resistance, antibacterial properties, etc.
Chinese patent document CN104379243 has developed a polyamide water treatment separation membrane with excellent oxidation resistance and chlorine resistance and its preparation method. The polyamide layer in the membrane contains a solubility parameter value of 9 to 22 (J / cm 3 ) 1 / 2 phenolic antioxidants, but this method does not consider the effect of the addition of phenolic antioxidants on membrane separation performance, including flux and rejection

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a high-performance composite membrane for water treatment, the steps are as follows:

[0025] (1) Preparation of aqueous phase reaction solution: prepare a copper chloride aqueous solution with a concentration of 0.5wt%, and obtain a clear and translucent solution after the dissolution is complete. Add an equal stoichiometric sodium hydroxide aqueous solution to the solution drop by drop until the pH of the solution reaches 7 up to; add m-phenylenediamine in this solution, make its concentration be 3wt%, then stir 30min at 30 ℃;

[0026] (2) Prepare the organic phase reaction solution: add trimesoyl chloride to n-hexane solvent to make the concentration of trimesoyl chloride 0.1wt%, and after the solution is completely dissolved at room temperature, put it into a closed container and fill it with nitrogen to store it for later use;

[0027] (3) Composite membrane coating: The porous support membrane is a polysulfone flat membrane scraped on the no...

Embodiment 2

[0031] A method for preparing a high-performance composite membrane for water treatment, the steps are as follows:

[0032] (1) Preparation of aqueous phase reaction solution: prepare a zinc chloride aqueous solution with a concentration of 0.5wt%, and obtain a clear and translucent solution after complete dissolution, and add an equal stoichiometric sodium hydroxide aqueous solution drop by drop to the solution system pH Up to 7, add piperazine to the solution to make the concentration 3wt%, and stir at 20°C for 60min;

[0033] (2) Prepare the organic phase reaction solution: add biphenyltetrayl chloride to the n-heptane solvent to make the concentration 3wt%, and after it is completely dissolved at room temperature, put it into a closed container and store it with nitrogen gas;

[0034] (3) Composite membrane coating: The porous support membrane is a dry-wet spinning polysulfone hollow fiber membrane. Completely immerse the porous support membrane in the aqueous phase react...

Embodiment 3

[0038] A method for preparing a high-performance composite membrane for water treatment, the steps are as follows:

[0039] (1) Prepare the aqueous phase reaction solution: prepare a mixed aqueous solution of magnesium chloride and copper chloride with a concentration of 4wt% (mass ratio = 25%: 75%), and obtain a clear and translucent solution after the dissolution is complete. Add the solution drop by drop, etc. Stoichiometric sodium hydroxide aqueous solution, until the pH of the solution system reaches 7, add o-phenylenediamine to the solution to make the concentration 4wt%, and stir at 40°C for 45min;

[0040] (2) Prepare the organic phase reaction solution: add isophthaloyl chloride to the mixed solvent of n-heptane and n-hexane (volume ratio = 10%:90%) to make the concentration 0.6wt%, and dissolve it completely at room temperature , into an airtight container, filled with nitrogen for storage.

[0041] (3) Composite membrane coating: The porous support membrane is a bl...

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PUM

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Abstract

The invention relates to a preparation method of a high-performance composite membrane used for water treatment. According to the preparation method, interfacial polymerization is adopted so as to prepare a functional layer on a porous support membrane. In preparation processes, an adopted water-phase reaction solution contains an in-suit generated inorganic nano hydroxide with excellent dispersity; interaction of the nano-scale hydroxide with groups in the functional layer enables that the nano-scale hydroxide can be coated by the network structure of the functional layer firmly, and the high-performance composite membrane is provided with long-term stable hydrophilic performance, chlorine resistance, pollution resistance, antibacterial properties, and excellent separation performance.

Description

Technical field [0001] The present invention is a high -molecular membrane technology field, which involves a preparation method for a high -performance composite film for water treatment. Background technique [0002] At present, most of the composite membrane for water treatment is composite filtrate or reverse osmosis membrane obtained by polylamine and polyramide on the surface interface of the polyunolic support membrane.As a result, the decline in membrane performance is shortened or even failure, and the service life of the membrane is shortened, which greatly limits the application of nanofiltration / reverse osmosis composite membrane in water treatment.In addition, the hydrophilicity and pollution resistance of conventional cross -linking the surface of the functional layer of the aromatherapy also need to be further improved.When the composite membrane is applied to water treatment, the fungus substances in various water quality will lead to a sharp decline in the genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/02B01D69/12B01D67/00C02F1/44
Inventor 李红宾石文英朱进忠邹青云魏兵兵
Owner HENAN INST OF ENG
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