A preparation method of polyethersulfone ultrafiltration membrane with improved permeability and selectivity at the same time

A polyethersulfone ultrafiltration membrane and selective technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology and other directions, can solve the problems of low permeability of polyethersulfone ultrafiltration membrane, and achieve high industrial applications Value, porosity increase, effect of separation layer thickness increase

Active Publication Date: 2016-07-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The object of the present invention is to solve the problem of low permeability of polyethersulfone ultrafiltration membrane, and propose a polyethersulfone ultrafiltration that uses water-soluble polyethyleneimine as an additive to regulate the membrane structure in the phase inversion process while improving permeability and selectivity Membrane preparation method, specifically a preparation method of polyethersulfone ultrafiltration membrane with improved permeability and selectivity

Method used

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  • A preparation method of polyethersulfone ultrafiltration membrane with improved permeability and selectivity at the same time
  • A preparation method of polyethersulfone ultrafiltration membrane with improved permeability and selectivity at the same time
  • A preparation method of polyethersulfone ultrafiltration membrane with improved permeability and selectivity at the same time

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preparation example Construction

[0025] A method for preparing a polyethersulfone ultrafiltration membrane with improved permeability and selectivity simultaneously, the method comprising:

[0026] (1) Preparation of casting solution: Mix four components of polyethersulfone, polyethyleneimine, polyvinylpyrrolidone and solvent to make a casting solution, heat and stir to dissolve, and after forming a homogeneous solution, let it stand for defoaming for later use ;

[0027] The ratio of polyethersulfone, polyvinylpyrrolidone, polyethyleneimine, and N-N dimethylformamide is as follows, and its component content is:

[0028]

[0029] All percentages are by weight;

[0030] (2) Use a scraper to form a uniform solution layer on a glass plate with the above-mentioned degassed solution, pre-evaporate, the pre-evaporation medium is air, and then immerse in a coagulation bath to form a film; after the film is formed, fully wash it with ultrapure water , remove solvent, and save.

Embodiment 1

[0033] Dissolve 0.1 g of polyethyleneimine in 78.9 g of N-N dimethylformamide, add 16 g of polyethersulfone (PES) and 5 g of polyvinylpyrrolidone (PVP) after it is completely dissolved, and place it in a 60°C oil bath Continue to stir for 6-8 hours to form a homogeneous casting solution. The casting solution is left to stand for more than 12 hours for defoaming.

[0034] The defoamed casting solution was scraped on a clean glass plate at 25°C and 60% relative humidity, and stayed in the air for 30 seconds, then soaked in a coagulation bath for half an hour, taken out and soaked in deionized water, and Store in deionized water until use. Its pure water flux is 239L / m 2 ·h·bar, bovine serum albumin (67000MW) rejection rate is 95.5%.

Embodiment 2

[0036] Dissolve 0.3 grams of polyethyleneimine in 78.7 grams of N-N dimethylformamide, add 16 grams of polyethersulfone (PES) and 5 grams of polyvinylpyrrolidone (PVP) after it is completely dissolved, and place it in an oil bath at 60 ° C Continue to stir for 6-8 hours to form a homogeneous casting solution. The casting solution is left to stand for more than 12 hours for defoaming.

[0037] The defoamed casting solution was scraped on a clean glass plate at 25°C and 60% relative humidity, and stayed in the air for 30 seconds, then soaked in a coagulation bath for half an hour, taken out and soaked in deionized water, and Store in deionized water until use. Its pure water flux is 359L / m 2 ·h·bar, bovine serum albumin (67000MW) rejection rate is 96.1%.

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Abstract

The invention discloses a preparation method of a polyethersulfone ultrafiltration membrane which improves both permeability and selectivity. The ultrafiltration membrane is prepared by a phase inversion method, and PEI is used as an additive. The addition of PEI changes the phase inversion process and regulates the structure of the PES ultrafiltration membrane to achieve high flux and high selectivity. The preparation includes: (1) dissolving PEI in a solvent (DMF), then adding polyethersulfone and polyvinylpyrrolidone (PVP) to heat and dissolve to form a homogeneous casting solution; (2) then controlling the film-forming conditions to prepare a flat film. The invention effectively regulates the structure of the PES ultrafiltration membrane, increases the opening ratio and the thickness of the selective layer, and greatly improves the permeability and selectivity. The preparation method is simple, and is suitable for industrial production and the preparation of nanofiltration membrane base membranes.

Description

technical field [0001] The invention belongs to the technical field of separation and purification ultrafiltration membranes, preparation and modification, and in particular relates to a preparation method of polyethersulfone ultrafiltration membranes with improved permeability and selectivity. Background technique [0002] Polyethersulfone (PES) has good chemical stability, high temperature resistance, acid and alkali resistance, strong mechanical stability, high oxidation resistance and chlorine resistance, and is currently one of the most commonly used ultrafiltration membrane materials. However, the low permeability of PES membrane and the inability to increase the water flux and rejection rate of the membrane limit its application and treatment efficiency. [0003] At present, researchers mainly focus on improving the permeability of ultrafiltration membranes to improve their hydrophilicity. The methods adopted are mainly three types: one is surface coating, which is si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 李健生王连军方小峰陆锐孙秀云沈锦优韩卫清刘晓东
Owner NANJING UNIV OF SCI & TECH
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