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
CN104056557BActive Publication Date: 2016-07-06NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2016-07-06

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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.
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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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