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Preparation method of hydrophilic polyethersulfone microfiltration membrane

A manufacturing method and hydrophilic technology, which are applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane damage, harsh conditions of polyethersulfone sulfonation reaction, difficult to carry out stably, etc. cumbersome effect

Inactive Publication Date: 2015-01-07
NANJING SHUISI ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But the disadvantage of the above method is that, in order to achieve the expected hydrophilic effect, the amount of hydrophilic additives added is usually more. The amount of hydrophilic polyacrylonitrile blended in solution is 25% by weight of polyethersulfone; the presence of large amounts of additives in the membrane (with a corresponding reduction in the amount of PES) will reduce the important properties of PES membranes (such as in acidic and alkaline media High stability, mechanical strength and thermal stability, etc.
The low-temperature plasma treatment and chemical oxidation treatment of the membrane surface require additional equipment, which sometimes causes damage to the membrane. The technology and equipment used for this process still need further research and development
The conditions of polyethersulfone sulfonation reaction are harsh, and it is difficult to carry out stably. The cost of sulfonated polyethersulfone is high, which is 2 to 10 times the cost of polyethersulfone raw materials.

Method used

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  • Preparation method of hydrophilic polyethersulfone microfiltration membrane
  • Preparation method of hydrophilic polyethersulfone microfiltration membrane
  • Preparation method of hydrophilic polyethersulfone microfiltration membrane

Examples

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Embodiment

[0041] Dissolve 9-20% of the total mass of polyethersulfone in 20-70% of N,N-dimethylacetamide, add 5-60% of the total mass of polyethylene glycol (molecular mass 400- 20000), 1-10% alkylbenzenesulfonate and 5-50% polyvinylpyrrolidone, stir and dissolve, add 0.1-15% nano-TiO with a particle size of 10-200nm to the above solution 2 , Stir vigorously to obtain the casting solution; scrape the casting solution on the non-woven fabric at room temperature to form a 0.2-0.3mm liquid film, evaporate for 1-5min, immerse in the aqueous solution coagulation bath for phase inversion, and form a film, that is, get Nano TiO2 composite polyethersulfone membrane.

[0042] Table 1 is each material proportioning (wt%) in the embodiment:

[0043] .

[0044] Note: what embodiment 4 adds is nanometer SiO2, embodiment 5 adds nanometer ZrO2.

[0045] Table two is the process parameter of each embodiment:

[0046] .

[0047]Table 3 shows the parameters and specifications of the finished pol...

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Abstract

The invention discloses a preparation method of a hydrophilic polyethersulfone microfiltration membrane. The preparation method comprises the following steps: 1, uniformly mixing polyethersulfone, an organic solvent, a non-solvent, a surfactant, an additive and hydrophilic nanoparticles into a membrane casting solution; 2, scraping the casting solution in the step 1 into a liquid membrane with the thickness of 0.2-0.4mm; 3, evaporating the liquid membrane in the step 2 in air for 6-60s at the room temperature; 4, immersing the liquid membrane in the step 3 into a coagulation bath for phase inversion to complete a preparation process. By the preparation method, the hydrophilic polyethersulfone microfiltration membrane is good in hydrophilic effect, high in flux and low in cost.

Description

technical field [0001] The invention relates to a method for manufacturing a microfiltration membrane, in particular to a method for manufacturing a hydrophilic polyethersulfone microfiltration membrane, and the microfiltration membrane is applied to a membrane bioreactor. Background technique [0002] Compared with traditional separation technologies, such as evaporation, extraction, coagulation, ion exchange, etc., membrane separation technology is more and more widely used because it has no phase change, can be operated at room temperature, and has low energy consumption and low operating costs. . [0003] Membrane bioreactor is an efficient biological treatment technology integrating biological treatment and membrane separation. It has the following characteristics: (1) compact structure and small footprint; (2) high treatment efficiency and good effluent quality, fundamentally solving the Sludge bulking problem; (3) High volumetric load and strong impact load resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D67/00
Inventor 王勇梅翔姚文桥
Owner NANJING SHUISI ENVIRONMENTAL PROTECTION TECH
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