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Separation membrane and preparation method and application thereof

A separation membrane and phase separation technology, applied in the field of membrane separation, can solve the problems of exacerbating the consumption of chemical polymer materials and non-renewable petrochemical resources, human health and ecological environment hazards

Inactive Publication Date: 2020-07-31
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Along with a series of unavoidable problems such as membrane fouling and membrane aging, in order to ensure the treatment efficiency of membrane separation, it is necessary to replace the separation membrane regularly, which intensifies the consumption of chemical polymer materials and non-renewable petrochemical resources, and also produces Huge amount of waste separation membrane
In addition to the shortage of production raw materials, chemical polymer separation membranes are also prone to produce a variety of solid, liquid, and gaseous wastes that are harmful to human health and the ecological environment during the production and preparation process. , no matter what treatment and disposal method is adopted (such as decomposition, incineration, landfill, etc.), the process is very likely to cause harm to human health and the ecological environment

Method used

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  • Separation membrane and preparation method and application thereof
  • Separation membrane and preparation method and application thereof
  • Separation membrane and preparation method and application thereof

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preparation example Construction

[0036] see figure 1 , the preparation method of the separation membrane of an embodiment, comprises the steps:

[0037] Step S110: Dissolving the degradable natural polymer to obtain a casting solution, the degradable natural polymer includes one of chitosan, cellulose and chitin.

[0038] The sources of the above-mentioned degradable natural polymers are abundant. By selecting different degradable natural polymers, the production cost can be reduced, the structure of the separation membrane can be optimized, the performance of the separation membrane can be improved, and the scope of application of the separation membrane can be expanded.

[0039] In one embodiment, the degradable natural polymer is chitosan. Chitosan is obtained by deacetylation of chitin. Chitin, also known as chitin and chitin, is a natural polysaccharide extracted from the exoskeleton of crustaceans such as shrimps, crabs, insects, and higher fungi. It has a wide range of sources, abundant reserves, ra...

Embodiment 1

[0079] The separation membrane of the present embodiment is a modified chitosan separation membrane containing silver nanoparticles, and the preparation process is as follows:

[0080] Lithium hydroxide monohydrate (LiOH·H 2 O), potassium hydroxide and urea were dissolved in ultrapure water, among them, lithium hydroxide monohydrate (LiOH·H 2 O), the mass ratio of potassium hydroxide, urea and water is 8:7:8:77. After being completely dissolved, add 1% silver nanoparticles of the mass of chitosan, and ultrasonically disperse the silver nanoparticles in the solution for 1 h in an ultrasonic pot, then add a certain amount of chitosan powder to make the shell in the casting solution The mass concentration of polysaccharide is 4%, and it is stirred evenly. Then put it into a low-temperature freezer to freeze at -80°C, take it out and stir it with an electric mixer, repeat 3 times until the chitosan powder is evenly dissolved, and then centrifuge at a speed of 11000rpm for 12min ...

Embodiment 2

[0082] The separation membrane of this embodiment is a modified cellulose separation membrane containing thymol oil, and the preparation process is as follows:

[0083] Lithium hydroxide monohydrate (LiOH·H 2 O) and urea were dissolved in ultrapure water, in which lithium hydroxide monohydrate (LiOH·H 2 O), the mass ratio of urea and water is 8: 15: 77. After it is completely dissolved, add thymol oil with a volume mass fraction of 1% of cellulose, and ultrasonically disperse the thymol oil in the solution for 1 hour in an ultrasonic pot, and then add a certain amount of cellulose powder to make the cast film The mass fraction of cellulose in the liquid is 4%, and it is stirred evenly. Then put it into a low-temperature freezer to freeze at -50°C, take it out and stir it with an electric mixer, repeat 3 times until the cellulose powder is evenly dissolved, and then centrifuge at 8000rpm for 15min in a refrigerated centrifuge at -5°C to remove air bubbles , to obtain the mod...

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Abstract

The invention relates to a separation membrane as well as a preparation method and application thereof. The preparation method of the separation membrane comprises the following steps: dissolving a degradable natural polymer, which comprises one of chitosan, cellulose and chitin to obtain a membrane casting solution; dispersing a slow-release anti-degradation substance in the membrane casting solution to obtain a modified membrane casting solution, wherein the slow-release anti-degradation substance comprises one of silver nano particles, copper nano particles, thymol oil, ginger oil and cloveessential oil; forming a membrane from the modified membrane casting solution to obtain a liquid membrane; and carrying out phase inversion or phase separation on the liquid membrane to obtain the separation membrane. The raw material sources are wide, the prepared separation membrane has little environmental pollution, the separation performance of the separation membrane can be maintained in the using process, and the separation membrane is naturally decomposed after the service life of the separation membrane is reached.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a separation membrane and its preparation method and application. Background technique [0002] Membrane separation technology emerged in the 1960s and has developed rapidly in the past 30 years. It has been widely used in water treatment, seawater desalination, gas separation, chemical production, food and beverage, medical treatment and energy storage, etc. In many industries in China, it has made great contributions to improving people's living standards and promoting national economic development. The key to membrane separation technology is to prepare high-performance separation membranes, that is, to ensure high permeation flux while retaining target components. At present, most of the separation membranes in the domestic and foreign markets are made of chemical polymer materials (such as polysulfone, polyethersulfone, polytetrafluoroethylene, polyacrylonitrile, etc.) ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/08B01D71/10B01D67/00C02F1/44B01D53/22A61M1/16
CPCA61M1/16B01D53/228B01D67/0079B01D71/08B01D71/10B01D2325/48C02F1/44
Inventor 刘鑫李炜怡石述宇涂国权杜东宇李卓
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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