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Polysulfate flat ultrafiltration membrane and preparation method thereof

A polysulfate, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of inapplicability, complex membrane formation methods, and low membrane flux.

Inactive Publication Date: 2020-06-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although UF membranes with a range of pore sizes have been successfully prepared in these reports, the membrane formation method is complicated and the membrane flux is low.
At present, there is no report on polymer ultrafiltration membranes with a series of pore sizes that are simple in membrane formation and easy to implement.
[0004] In addition, in the separation process of crude oil extraction, pharmaceuticals, coatings and papermaking industries, the solution often has a certain degree of alkalinity, while traditional polymer materials such as cellulose and polyvinylidene fluoride are easily degraded under alkaline conditions, so they are not suitable for in the above industries

Method used

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  • Polysulfate flat ultrafiltration membrane and preparation method thereof
  • Polysulfate flat ultrafiltration membrane and preparation method thereof
  • Polysulfate flat ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Add 3.0g of polysulfate (Mn=60,000g / mol) into 27.0g of N-methylpyrrolidone (10% polymer concentration), stir at 80°C until completely dissolved, cool to room temperature, and centrifuge at 10,000rpm to defoam. Scratch coating on a glass plate, immediately immerse in a deionized water coagulation bath at 10°C to solidify to form a film, and after the solvent in the film is completely replaced by deionized water, continue to soak it in deionized water for storage until use. The tensile strength of the membrane is 1.35MPa, the average pore size of the membrane surface is 44.2nm, and the pure water flux is 356.9Lm at room temperature and 0.1MPa pressure -2 h -1 .

Embodiment 2

[0035] Add 0.3g of polyvinylpyrrolidone K30 and 1.5g of PEG-200 to 24.3g of N,N-dimethylformamide, dissolve completely at 30°C, then add 5.7g of polysulfate (Mn=90,000g / mol), at 80°C After standing still for degassing, scrape it on a glass plate, and immediately immerse it into a deionized water coagulation bath to solidify to form a film. The temperature of the coagulation bath is 15°C. After the solvent in the film is completely replaced by deionized water, continue to It was soaked in deionized water and stored until use. The film tensile strength was 1.95 MPa. At room temperature and 0.1MPa pressure, the pure water flux is 217Lm -2 h -1 , The retention rate of 1.0g / L BSA (0.1M PBS buffer solution) is 91%. After cross-flow filtration for 30 minutes with BSA as the model pollutant, backwash for 5 minutes, the flux recovery rate was 81.3%.

Embodiment 3

[0037] Add 5.7g polysulfate (Mn=60,000g / mol) into 24.3g N,N-dimethylacetamide (19% polymer concentration), stir at 80°C until completely dissolved, cool to room temperature, 10000rpm Centrifugal defoaming, scrape coating on a glass plate, immediately immerse in a deionized water coagulation bath to solidify to form a film, the temperature of the coagulation bath is 20°C, after the solvent in the film is completely replaced by deionized water, continue to soak it in deionized water Save until use. The tensile strength of the membrane is 2.05MPa, the average pore diameter of the membrane surface is 72nm, and the pure water flux is 187Lm under room temperature and 0.1MPa pressure -2 h -1 .

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Abstract

The invention discloses a polysulfate flat ultrafiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: fully dissolving or dispersing an additive and a filler in a solvent, dissolving polysulfate in the obtained solution, completely defoaming, coating a supporting plate with the solutionin a scraping manner, and finally immersing the supporting plate in a coagulating bath to form a film. A series of polysulfate ultrafiltration membranes with different pore sizes are prepared by introducing the additive and the filler and changing the concentration of the solvent or a polymer. The addition of the filler can significantly improve the antibacterial and anti-pollution properties, increase the mechanical strength and improve the structural stability, and meanwhile, the polysulfate membrane has excellent acid and alkali resistance and shows wide industrial application potential.

Description

technical field [0001] The invention relates to the technical field of polymer membrane preparation and membrane separation, in particular to a polysulfate flat ultrafiltration membrane and a preparation method thereof. Background technique [0002] As a new type of separation technology, membrane separation technology has the advantages of simple operation, high equipment packing density, mild working conditions, energy saving, and no secondary pollution. It is an important technology to solve the problems of resource-based water shortage and water quality-based water shortage. It is considered to be the key technology of the chemical industry in the 21st century. According to different separation processes, membrane technology can be divided into microfiltration, ultrafiltration, nanofiltration, reverse osmosis, pervaporation and gas separation. Ultrafiltration technology usually uses a porous membrane with a pore size of 2-100nm and a skin thickness of 0.1-10μm as the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D61/14B01D71/72B01D67/00
CPCB01D61/145B01D67/0011B01D67/0013B01D67/0016B01D69/06B01D71/72
Inventor 安全福周敬源殷明杰王乃鑫秦振平
Owner BEIJING UNIV OF TECH
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