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Surface mineralized composite reverse osmosis membrane with high hydrophilicity

A reverse osmosis membrane, water-based technology, applied in semi-permeable membrane separation, general water supply saving, osmosis/dialysis water/sewage treatment and other directions, can solve the problems of increasing operating costs, restricting the popularization and application of polyamide composite reverse osmosis membranes, etc. To achieve the effects of improved surface hydrophilicity, good anti-pollution performance and simple preparation method

Inactive Publication Date: 2013-11-13
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamide composite reverse osmosis membranes inevitably have membrane fouling during use. Membrane fouling and cleaning will lead to increased operating costs, which severely restricts the popularization and application of polyamide composite reverse osmosis membranes, especially in Applications in the fields of highly polluted water treatment, water reuse, and chemical separation

Method used

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  • Surface mineralized composite reverse osmosis membrane with high hydrophilicity
  • Surface mineralized composite reverse osmosis membrane with high hydrophilicity
  • Surface mineralized composite reverse osmosis membrane with high hydrophilicity

Examples

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preparation example Construction

[0031] 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 12.5wt%, 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 100,000 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.

[0032] Preparation of polyamide polymer desalination layer: Coat the surface of wet polysulfone support membrane with polyamine solution, roll the surface of the support membrane with a rubber roller and squeeze it dry, and then coat the surface of the...

Embodiment 1-8

[0050]Table 1: Membrane performance of composite reverse osmosis membranes with different desalination layer materials after surface mineralization treatment

[0051]

[0052]

[0053] The above examples show that: the barium sulfate coating is deposited on the surface of the composite reverse osmosis membrane composed of porous polysulfone support membrane and different polyamide desalination layer materials through mineralization treatment, and the desalination rate of the composite reverse osmosis membrane obtained by the new structure is maintained. Unchanged or slightly improved, the hydrophilicity and water flux of the membrane surface are superior to the traditional composite reverse osmosis membrane composed of a porous support layer and a polymer desalination layer.

Embodiment 9-15

[0055] Table 2: Performance of composite reverse osmosis membranes with different mineralized layer thicknesses

[0056]

[0057]

[0058] The above examples show that: the surface of the composite reverse osmosis membrane composed of porous polysulfone support membrane and fully aromatic polyamide desalination layer is coated with barium sulfate coating through mineralization treatment, and the hydrophilicity of the composite reverse osmosis membrane of the new structure obtained is Both are superior to the traditional composite reverse osmosis membrane composed of a porous support layer and a polymer desalination layer, but an overly thick mineralized layer will lead to a decrease in the desalination rate and water flux of the composite reverse osmosis membrane, and the membrane with a coating material thickness of less than 150nm The salt rejection rate and water flux are better than those of composite reverse osmosis membranes with unmineralized surface.

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Abstract

The invention relates to a macromolecular composite membrane and in particular relates to a surface mineralized composite reverse osmosis membrane with high hydrophilicity. The composite reverse osmosis membrane is used for performing water treatment and is characterized by compositing a polyamide macromolecular desalination layer on a porous support membrane through interfacial polycondensation between polyamine and poly-acyl chloride and compositing a barium sulfate coating on the macromolecular desalination layer through the technology of mineralization by alternate impregnation in solutions. The hydrophilicity of the composite reverse osmosis membrane is greatly improved by depositing high-hydrophilicity inorganic materials on the surface of the existing polyamide composite reverse osmosis membrane. The composite reverse osmosis membrane has the advantages that on the premise that the desalination rate is unchanged or is slightly increased, the water flux of the composite reverse osmosis membrane is higher than that of the traditional composite reverse osmosis membrane formed by a porous support layer and a macromolecular desalination layer; and a preparation method is simpler. The composite reverse osmosis membrane has a wide range of 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 polyamide composite reverse osmosis membrane with better surface hydrophilicity after surface mineralization treatment. technical background [0002] Reverse osmosis membrane separation technology is a high-efficiency, energy-saving and green new separation technology with outstanding features such as simple equipment, mild operating conditions, large processing capacity, and high separation efficiency. Biological product 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, membrane separation technology has Fields such as resource development and recycling have been more widely used and valued. [0003] Using the porous membrane ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D69/02B01D67/00C02F1/44
CPCY02A20/131
Inventor 俞三传刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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