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Hollow fiber nanofiltration membrane and preparation process thereof

A nanofiltration membrane and fiber technology, which is applied in the field of hollow fiber nanofiltration membrane and its preparation, can solve the problems of long dissolution time, long process flow, and short storage time when easy to be closed, achieve uniform pore size distribution of the membrane, and solve the problem of long process flow. , the effect of shortening the time of membrane pore retention

Inactive Publication Date: 2019-04-12
SHUANGJIE HIGH TECH DEV JILIN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a hollow fiber nanofiltration membrane and its preparation process in view of the defects in the prior art. The membrane produced in the process is peeled off from the ultrafiltration basement membrane, the material is dissolved and heated inhomogeneously, the dissolution time is long, the pore size of the membrane is not uniform, the pore size is easy to close and the storage time is short; and it solves the problems of long process flow, short service life and Low water production and high energy consumption

Method used

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  • Hollow fiber nanofiltration membrane and preparation process thereof

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Embodiment 1

[0029] Embodiment 1: a kind of preparation method of hollow fiber nanofiltration membrane, concrete steps are:

[0030] 1) Extraction of spinning solution: Put 30 parts by mass of polyethersulfone, 2 parts of pore-forming agent, and 58 parts of organic solvent into the dissolution tank, and stir for 1 hour at 90°C with a crusher at a forward speed of 66 rpm. Stop for 30 seconds, reverse speed 66 rpm, stir at 90°C for 50 minutes, stop for 30 seconds, mix and break and stir for 4 hours to fully dissolve and swell until completely dissolved into spinning solution;

[0031] 2) Spinning: pass the spinning solution in step 1) through a 300-mesh filter membrane to remove impurities, and then enter a vacuum degassing device with a vacuum degree of -0.08 MPa, and pretreatment at a temperature of 90°C to remove air bubbles for 12 minutes; The impurity-free spinning liquid is made into a hollow fiber nanofiltration membrane nascent membrane by dry-jet wet spinning;

[0032] 3) Curing: T...

Embodiment 2

[0034] Embodiment 2: a kind of preparation method of hollow fiber nanofiltration membrane, concrete steps are:

[0035] 1) Extraction of spinning solution: put 30 parts by mass of polyethersulfone, 12 parts of pore-forming agent, and 58 parts of organic solvent into the dissolution tank, and stir for 1 hour at 90°C with a crusher at a forward speed of 133 rpm. Stop for 60 seconds, reverse speed 133 rpm, stir at 90°C for 50 minutes, mix and break and stir for 4 hours to fully dissolve and swell until completely dissolved into spinning solution;

[0036] 2) Spinning: pass the spinning solution in step 1) through a 300-mesh filter membrane to remove impurities, and then enter a vacuum defoaming device with a vacuum degree of -0.1 MPa, and pretreat the air bubbles at a temperature of 90°C for 10 minutes; The impurity-free spinning liquid is made into a hollow fiber nanofiltration membrane nascent membrane by dry-jet wet spinning;

[0037] 3) Curing: The hollow fiber nanofiltratio...

Embodiment 3

[0039] Embodiment 3: a kind of preparation method of hollow fiber nanofiltration membrane, concrete steps are:

[0040] 1) Extraction of spinning solution: put 40 parts by mass of polyethersulfone, 12 parts of pore-forming agent, and 68 parts of organic solvent into the dissolution tank, and stir for 2 hours at 90°C with a crusher at a forward speed of 133 rpm. Stop for 60 seconds, reverse speed 133 rpm, stir at 90°C for 59 minutes, stop for 30 seconds, mix and break and stir for 6 hours to fully dissolve and swell until completely dissolved into spinning solution;

[0041] 2) Spinning: Pass the spinning liquid in step 1) through a 400-mesh filter membrane to remove impurities, and then enter a vacuum degassing device with a vacuum degree of -0.06 MPa, and pretreat the air bubbles at a temperature of 90°C for 14 minutes; The impurity-free spinning liquid is made into a hollow fiber nanofiltration membrane nascent membrane by dry-jet wet spinning;

[0042] 3) Curing: The hollo...

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Abstract

The invention relates to a preparation method of a hollow fiber nanofiltration membrane. The method is characterized by including the steps of spinning solution preparation, spinning, curing and post-treatment pore retention. The spinning solution preparation includes: adding polyethersulfone, a pore-making agent and an organic solvent into a dissolving tank, utilizing a crusher for forward rotating stirring, and stopping the action for 30-60s, then conducting reverse rotating stirring, and stopping the action for 30s, conducting mixing crushing stirring for full dissolution until a spinning solution is obtained; the spinning includes: subjecting the spinning solution to the bubble removal pretreatment by a vacuum defoaming device; the curing includes: passing a primary membrane of the hollow fiber nanofiltration membrane through gas bath with a casting temperature of 30-50DEG C and a relative humidity of casting of 60-80% in order for curing pre-evaporation, then letting the primary membrane subjected to gas bath curing enter coagulating bath in a 15-40% dimethyl sulfoxide aqueous solution for stretching curing under a drafting godet stretching ratio of 1.9-2.3 times; and the post-treatment pore retention includes: conducting steam washing and pore retention ultrasonic cleaning on the stretch cured hollow fiber nanofiltration membrane in order, and finally performing air-drying, thus obtaining the hollow fiber nanofiltration membrane.

Description

technical field [0001] The invention relates to a hollow fiber nanofiltration membrane and a preparation process thereof. Background technique [0002] Since the fiber nanofiltration membrane technology is a new technology under development, the existing nanofiltration membrane production process is complicated and generally consists of surface coating, interface polymerization and other preparation methods. The nanofiltration membrane is single internal pressure filtration, and the membrane pores formed on the membrane surface are blocked. Such reasons lead to the adsorption and deposition of pollutants in the membrane pores, resulting in the decrease of membrane flux and the change of membrane separation characteristics. The time for users to frequently replace the nanofiltration membrane increases the cost of use. [0003] Chinese invention patent application number CN201810537922 discloses "A Preparation Method of Hollow Fiber Composite Nanofiltration Membrane", which i...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/08B01D67/00
CPCB01D67/0013B01D69/08B01D71/68
Inventor 施展任春媛施美卉朱璐李淼金淑杰张志杰王晓亮
Owner SHUANGJIE HIGH TECH DEV JILIN CITY
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