A kind of polyethersulfone microfiltration membrane and preparation method thereof

A polyethersulfone and microfiltration membrane technology, applied in the field of membrane separation, can solve the problems of small flux, low separation efficiency, irregular structure of poly-sealed microfiltration membrane, etc. The effect of prolonged membrane time

Active Publication Date: 2017-09-01
安得膜分离技术工程(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained poly-sealed microfiltration membrane structure is irregular, the separation efficiency is low, and the flux is small

Method used

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Examples

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Effect test

preparation example Construction

[0022] The embodiment of the present invention discloses a preparation method of a polyethersulfone microfiltration membrane, comprising the following steps:

[0023] (A) dissolving polyethersulfone and additives in an organic solvent to obtain a casting solution;

[0024] (B) After scraping the film from the casting solution, solidify it in a coagulation bath of liquid organic solvent and water to obtain a wet film;

[0025] The liquid organic solvent is one or more of dimethylformamide, N-methylpyrrolidone, dimethylacetamide, γ-hydroxybutyrolactone and ethanol; the mass percentage of the liquid organic solvent The concentration is 5-40%;

[0026] (C) drying the wet membrane in an aqueous solution containing a surfactant to obtain a polyethersulfone microfiltration membrane.

[0027] In the present invention, polyethersulfone and additives are firstly dissolved in an organic solvent to obtain a casting solution. Preferably, the dried polyethersulfone and additives are diss...

Embodiment 1

[0034] Weigh 84g of DMF and 84g of GBL into a mixing bucket, then add 4g of PVP to the mixing bucket, and add 28g of polyethersulfone polymer to the mixing bucket after the additives are completely dissolved in the solvent. Keep the casting solution at 75-80°C and stir for 5 hours. After the casting solution is completely stirred, pour it into a pressure vessel, vacuumize it for 0.5 hours and put it in a 20°C incubator; select 0.1um thick polyester non-woven fabric As the support layer, the thickness of the scraping film is controlled to be 0.03-0.04um, the film-forming speed is 12m / min, the exposure time in the air bath is 5s, and the film is formed in a coagulation bath containing 20% ​​ethanol at 25°C; the prepared wet film is soaked in a solution containing 2% SDS and 48% glycerin in a drying solution, the temperature of the drying solution is controlled at 20° C., the drying speed is 2 m / min, and drying is performed at 60° C.

[0035] Determination of pure water flux 360L...

Embodiment 2

[0037]Weigh 86g of DMF and 86g of GBL into a mixing bucket, then add 4g of PVA to the mixing bucket, and add 24g of polyethersulfone polymer to the mixing bucket after the additives are completely dissolved in the solvent. Keep the casting solution at 75-80°C and stir for 5 hours. After the casting solution is completely stirred, pour it into a pressure vessel, vacuumize it for 0.5 hours and put it in a 20°C incubator; select 0.1um thick polyester non-woven fabric As the support layer, the thickness of the scraped film is controlled to be 0.03-0.04um, the film-forming speed is 18m / min, the air bath exposure time is 4s, and the film is formed in a DMF coagulation bath containing 10% at 25°C; the prepared wet film is soaked in 1% SDS and 20% glycerin drying solution, control the temperature of the drying solution at 20°C, the drying speed at 2m / min, and dry at 45°C.

[0038] Measure the pure water flux of 800L / m at 0.1MPa 2 .h, the retention rate of yeast extract powder is grea...

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Abstract

The invention provides a preparation method of a polyether sulfone micro-filtration membrane. The preparation method includes the following steps that polyether sulfone and an additive are dissolved in an organic solvent, so that a casting solution is acquired; after membrane scraping is conducted on the casting solution, the casting solution is solidified in a coagulating bath of the liquid organic solvent and water, so that a wet membrane is acquired, wherein the liquid organic solvent is one or more of dimethylformamide, N-methyl pyrrolidone, dimethylacetamide, gamma-hydroxybutanoic acid and ethyl alcohol and the mass percentage concentration of the liquid organic solvent ranges from 5% to 40%; the wet membrane is dried in an aqueous solution containing a surface active agent, so that the polyether sulfone micro-filtration membrane is acquired. The aqueous solution containing the organic solvent is adopted for solidification, so that the sediment speed of the polyether sulfone in the coagulating bath is reduced, in other words, the membrane forming speed is reduced, membrane forming time is prolonged, large holes are prevented from being formed, formed membrane hole structures are uniform, the membrane flux is increased, and separation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a polyethersulfone microfiltration membrane and a preparation method thereof. Background technique [0002] Membrane and membrane separation technology is a new type of high-efficiency separation technology, especially in line with the needs of modern industry for energy saving, improvement of production efficiency, reuse of low-grade raw materials and elimination of environmental pollution. Compared with traditional separation methods (such as evaporation, extraction or ion exchange, etc.), membrane separation technology operates at room temperature without phase change, and is especially suitable for the separation and concentration of heat-sensitive substances and biologically active substances, with high efficiency and energy saving , simple process, less investment, less pollution, etc., so membrane separation technology has broad application prospects in chemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00
Inventor 岳英李政雄刘兴甜杜德志
Owner 安得膜分离技术工程(北京)有限公司
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