Method for preparing multi-channel hollow fiber nano-filtration membranes

A multi-channel, nanofiltration membrane technology, applied in the field of membrane separation, can solve the problems of industrial scale application limitations, low toughness and strength of hollow fiber nanofiltration membranes, and achieve continuous large-scale production, high strength, and broad application prospects Effect

Inactive Publication Date: 2016-12-14
江苏向阳科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Hollow fiber nanofiltration membranes have obvious advantages in flux and filling area compared with flat membranes, tubular membranes, etc. However, due to their low toughness and strength, hollow fiber nanofiltration membranes are greatly limited in industrial scale applications.

Method used

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  • Method for preparing multi-channel hollow fiber nano-filtration membranes

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Effect test

Embodiment 1

[0015] Add polyethersulfone, dimethylacetamide, and polyethylene glycol into the reactor at a mass ratio of 15%:40%:45% and stir for 24 hours to form a uniform and stable casting solution. After vacuum degassing for 12 hours, drive at 0.1MPa It is sprayed out through a multi-channel hollow fiber mold under pressure, the flow rate of the core liquid water is 10ml / min, and the air gap is 0cm, soaked in the water of the external coagulation bath for 24 hours, and dried at 50°C after taking it out.

Embodiment 2

[0017] Add polyethersulfone, dimethylacetamide, and polyethylene glycol into the reactor at a mass ratio of 15%:40%:45% and stir for 24 hours to form a uniform and stable casting solution. After vacuum degassing for 12 hours, drive at 0.1MPa It is sprayed out through a multi-channel hollow fiber mold under pressure, the flow rate of the core liquid water is 10ml / min, and the air gap is 5cm, soaked in the water of the external coagulation bath for 24 hours, and dried at 50°C after taking it out.

Embodiment 3

[0019] Add polyethersulfone, dimethylacetamide, and polyethylene glycol into the reactor at a mass ratio of 15%:40%:45% and stir for 24 hours to form a uniform and stable casting solution. After vacuum degassing for 12 hours, drive at 0.1MPa It is sprayed out through a multi-channel hollow fiber mold under pressure, the flow rate of the core liquid water is 10ml / min, and the air gap is 10cm, soaked in the water of the external coagulation bath for 24 hours, and dried at 50°C after taking it out.

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Abstract

The invention relates to a method for preparing multi-channel hollow fiber nano-filtration membranes. The method includes steps of (1), adding polymers, organic solvents and additives into a reaction kettle according to certain proportions, stirring the polymers, the organic solvents and the additives to form uniform and stable membrane casting solution, defoaming the membrane casting solution under a vacuum condition, ejecting the membrane casting solution via multi-channel hollow fiber molds under the driving effects of air pressures, feeding the membrane casting solution into external coagulating bath under certain core solution flow rate and air spacing conditions, carrying out phase transformation to form multi-channel hollow fiber basement membranes, sufficiently soaking the multi-channel hollow fiber basement membranes, then taking out the multi-channel hollow fiber basement membranes, airing the multi-channel hollow fiber basement membranes at certain temperatures, packaging the multi-channel hollow fiber basement membranes in stainless steel assemblies, plugging two ends of each stainless steel assembly by the aid of cotton and sealing the stainless steel assemblies by glue; (2), preparing aqueous-phase solution with certain concentration and oil-phase solution with certain concentration, injecting the aqueous-phase solution in multi-channel inner holes, reserving the aqueous-phase solution in the multi-channel inner holes for a certain period of time, purging the aqueous-phase solution by the aid of strong airflow, injecting the oil-phase solution into the multi-channel inner holes, reserving the oil-phase solution in the multi-channel inner holes for a certain period of time, purging the oil-phase solution by little airflow, arranging the multi-channel inner holes in an oven, carrying out reaction and taking the multi-channel inner holes out of the oven to obtain the multi-channel hollow fiber nano-filtration membranes. The method for preparing the multi-channel hollow fiber nano-filtration membranes has the advantages of high toughness and strength.

Description

technical field [0001] The invention relates to a preparation method of a multi-channel hollow fiber nanofiltration membrane. It belongs to the technical field of membrane separation. Background technique [0002] With the continuous advancement of science and technology and civilization in today's world, separation technology is widely used in daily life, and membrane separation technology is also receiving more and more attention. In addition to being used in desalination of seawater, brackish water, and preparation of pure water and ultrapure water, membrane separation technology is also widely used in the fields of food, chemical industry, electronics, environmental protection, biology, and medicine. [0003] Nanofiltration (NF) is an important part of membrane separation technology, and has a wide range of applications in pharmaceuticals, metallurgy, decolorization, dye recovery, and fruit juice concentration. The molecular weight cut-off of the nanofiltration membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/68B01D69/08B01D67/00
CPCB01D71/82B01D67/0009B01D67/0088B01D69/08B01D71/68B01D2325/24
Inventor 李祥庆许振良魏永明李文忠孙琦沈凯华任斌彬
Owner 江苏向阳科技有限公司
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