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Preparation method of low-pressure high-flux nanofiltration membrane

A technology of nanofiltration membrane and high low pressure, applied in the field of preparation of low pressure and high flux nanofiltration membrane, can solve problems such as complex process, and achieve the effects of high separation efficiency, large water flux and strong anti-pollution ability

Inactive Publication Date: 2015-01-14
LISHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ultrafiltration membrane is prepared by the phase inversion method, the film forming process is simple, and it is generally not necessary to evaporate the solvent at high temperature before the film is formed; It is carried out step by step with solidification and film formation, and the process is more complicated

Method used

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  • Preparation method of low-pressure high-flux nanofiltration membrane
  • Preparation method of low-pressure high-flux nanofiltration membrane
  • Preparation method of low-pressure high-flux nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 4 kg of lithium chloride and 4 kg of polyvinylpyrrolidone in 74 kg of N,N-dimethylacetamide, then add 18 kg of polyethersulfone, dissolve the mixture at 60°C at a constant temperature, and Degassing by heating at 50°C to obtain a casting solution. A certain amount of the prepared film casting solution was put into the trough 2, and the polyester non-woven fabric 1 was used as the support layer, and the thickness of the film was controlled to 0.25 mm by a feeler gauge. The non-woven fabric 1 passes through the trough 2 at a speed of 3 m / min driven by the motor 5, and the 0.25 mm thick casting liquid is scraped onto the non-woven fabric 1 by controlling the scraper in the trough 2. The relative humidity of the film-making room At 45%-50%, the temperature is 25°C-30°C; after coating the casting solution on the non-woven fabric 1, stay in the oven 3 at 90°C for 0.4 min, evaporate a part of the solvent, and then enter the gel tank 4 to solidify film forming. The p...

Embodiment 2

[0029] Dissolve 4 kg of lithium chloride and 4 kg of polyvinylpyrrolidone in 74 kg of N,N-dimethylacetamide, then add 18 kg of polyethersulfone, dissolve the mixture at a constant temperature of 60°C, and ℃ heating defoaming. A certain amount of casting solution was put into the trough 2, and the polyester non-woven fabric 1 was used as the support layer, and the thickness of the film was controlled to 0.25 mm by a feeler gauge. The non-woven fabric 1 passes through the trough 2 at a speed of 3 m / min driven by the motor 5, and the 0.25 mm thick casting liquid is scraped onto the non-woven fabric 1 by controlling the scraper in the trough 2. The relative humidity of the film-making room At 45%-50%, the temperature is 25°C-30°C; after coating the casting solution on the non-woven fabric 1, stay in the oven 3 at 90°C for 0.5 min, evaporate a part of the solvent, and then enter the gel tank 4 to solidify film forming. The prepared membrane was placed in tap water for more than 2...

Embodiment 3

[0031]Dissolve 6 kg of lithium chloride and 2 kg of polyvinylpyrrolidone in 74 kg of N,N-dimethylacetamide, then add 18 kg of polyethersulfone, dissolve the mixture at a constant temperature of 60°C, and ℃ heating defoaming. A certain amount of casting solution was put into the trough 2, and the polyester non-woven fabric 1 was used as the support layer, and the thickness of the film was controlled to 0.25 mm by a feeler gauge. The non-woven fabric 1 passes through the trough 2 at a speed of 3 m / min driven by the motor 5, and the 0.25 mm thick casting liquid is scraped onto the non-woven fabric 1 by controlling the scraper in the trough 2. The relative humidity of the film-making room At 45%-50%, the temperature is 25°C-30°C; after coating the casting solution on the non-woven fabric 1, stay in the oven 3 at 90°C for 0.4 min, evaporate a part of the solvent, and then enter the gel tank 4 to solidify film forming. The prepared membrane was placed in pure water for more than 2...

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Abstract

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method of a low-pressure high-flux nanofiltration membrane. The method comprises the steps of pouring a certain amount of mould liquid into a trough, wherein the mould liquid contains polyether sulfone, a pore-foaming agent and an organic solvent; a non-woven fabric passes through the trough under the drive of a motor, the mould liquid is scraped onto the non-woven fabric through controlling a scraper in the trough, the relative humidity of a membrane room is 45-50%, and the temperature of the membrane room is 25-30 DEG C; then enabling the mould liquid to pass through a dryer with the temperature of 80-100 DEG C, evaporating a solvent for 0.2-2min in the dryer, and finally solidifying into a membrane through a gel trough, wherein the evaporating of the solvent and the solidifying into membrane are automatically and continuously carried out. The membrane prepared by adopting the preparation method has the advantages of strong anti-pollution capacity, high separating efficiency and large water flux, and can be used for concentrating and desalting of dye in industry.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a low-pressure high-flux nanofiltration membrane. Background technique [0002] Nanofiltration (Nanofiltration) is a new type of membrane separation process developed in the late 1970s, and its separation performance is between reverse osmosis and ultrafiltration. The relative molecular mass cut-off (MWCO) is between 200 and 1000, and the surface pore size of the membrane is at the nanometer level. Due to the unique separation effect of nanofiltration membrane, it has been widely used in the separation and purification of substances in seawater softening, wastewater treatment, biopharmaceutical, petrochemical and other fields. [0003] The immersion-precipitation phase inversion method is a commonly used membrane-making method in the field, and is widely used in the preparation of ultrafiltration membranes and nanofiltration membra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/12B01D69/10B01D69/00B01D67/00
Inventor 黄健舒增年叶挺梅
Owner LISHUI UNIV
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