Acid-resistant composite reverse osmosis film

A reverse osmosis membrane, acid-resistant technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, membrane technology, etc., can solve problems restricting the application of composite reverse osmosis membranes, and achieve the effects of acid resistance and hydrophilicity, and simple preparation methods

Inactive Publication Date: 2010-07-28
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0009] Therefore, most of the composite reverse osmosis membranes for commercial production and industrial application are prepared by interfacial polymerization between aromatic polyamines and polyacyl chlorides. The desalination functional layer of the composite membrane is polyamide, and the minimum operating pH of the membrane is 2 , which restricts the application of composite reverse osmosis membranes in some acidic conditions (such as pH<2)

Method used

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  • Acid-resistant composite reverse osmosis film
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  • Acid-resistant composite reverse osmosis film

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Embodiment Construction

[0036] The implementation of the present invention is described in detail below:

[0037] Porous supporting membrane preparation: prepare by conventional method, the present invention is to dissolve N with 13% Udel PS3500LCD polysulfone, 0.2% water and 0.1% tensio-active agent, in N-dimethylacetamide, be coated with scraping on polysulfone After immersing in water to gel and remove the solvent, a support membrane with a molecular weight cut off (MWCO) of about 80,000 was obtained. Wherein the surfactant includes at least one of alkylphenol polyoxyethyl ester phosphate, sodium dodecylsulfonate and alkylphenol polyoxyethyl ester phosphate.

[0038] Preparation of 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 dry it with compressed air, then contact with the polyacyl chloride solution on one side for interfacial polymerization reaction. The nascen...

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Abstract

The invention discloses a structure of a polymer composite film, in particular to an acid-resistant composite reverse osmosis film. The invention is realized by compositing a polymer desalination layer on a porous support membrane, and arranging an acid-resistant hydrophilic polymer material layer on the polymer desalination layer. The invention has the advantages that the desalination and the water flux rate are no lower than those of the amide composite reverse osmosis film, the film is acid resistant, the surface of the film is more hydrophilic and the like, and the preparation method is simpler. The invention can be widely applied to acid solution separation places.

Description

technical field [0001] The invention relates to a structure of a polymer composite membrane, in particular to an acid-resistant polymer composite reverse osmosis membrane. 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 core of reverse osmosis technology is a high-performance reverse osmosis membrane. The reverse osmosis membranes that have been commercially produced and industrialized so far mai...

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Application Information

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IPC IPC(8): B01D69/10B01D69/12B01D61/08
CPCY02A20/131
Inventor 俞三传刘梅红
Owner ZHEJIANG SCI-TECH UNIV
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