Method for preparing large-diameter hollow fiber membrane and apparatus for implementing the method

A fiber membrane, large pore size technology, applied in the field of hollow fiber membrane and its preparation, can solve the problems of increasing the amount of solvent and the like

Inactive Publication Date: 2016-05-04
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering industrial factors such as film formation and environmental protection, increasing the temperature of the gel bath or increasing the amount of solvent will obviously bring other defects

Method used

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  • Method for preparing large-diameter hollow fiber membrane and apparatus for implementing the method
  • Method for preparing large-diameter hollow fiber membrane and apparatus for implementing the method
  • Method for preparing large-diameter hollow fiber membrane and apparatus for implementing the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 and 2 As shown, a conventional hollow fiber membrane wet spinning machine is used, the spinneret 4 is set inside the temperature and humidity control device 6 , and the supporting fiber 1 passes through the hollow cavity 608 of the temperature and humidity control device 6 . The hollow cavity 608 is provided with an air inlet and an air outlet, which are connected to the air inlet valve 604 and the air outlet valve 605 respectively, and the air inlet valve 604 is connected to the steam generator 603 . The walls of the hollow cavity 608 are jacketed with a water bath and connected to a liquid heating device 606 (for example realized by a liquid heating box). In addition, a temperature and humidity detector 602 is installed in the middle of the hollow cavity 608 and is connected to the temperature and humidity controller 601. The temperature and humidity controller 601 controls the inlet valve 604, the exhaust valve 605 and the temperature-controlled hea...

Embodiment 2

[0038] Wet spinning was carried out with the same formulation as in Example 1, except that the spinning was carried out at 70° C. and a humidity of 95% RH. The pure water flux of the obtained hollow fiber membrane is 3130L / m 2 .h, the average pore size of the membrane is 0.2 microns, such as Figure 4 .

Embodiment 3

[0043] Wet spinning was carried out with the same formula as in Example 1, except that the gel bath was 30% DMAC aqueous solution, and the coating was carried out at a dry range of 70° C. and a humidity of 95% RH.

[0044] The pure water flux of the obtained hollow fiber membrane is 4600L / m 2 .h, the average pore size of the membrane is 0.28 microns, such as Figure 6 .

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Abstract

The present invention provides a method for preparing a large-diameter hollow fiber membrane. The method comprises the steps of: outputting support fiber by a wire feeder; the fiber coating a membrane-making liquid on the support fiber; sending the support fiber coated with the membrane-making liquid into a coagulation bath; and drying and collecting filaments to obtain a hollow fiber membrane, wherein the coating of the membrane-making liquid is carried out at a temperature of 60-70 DEG C and humidity of 95%-100% RH. The method of the present invention can significantly increase the average pore diameter of the hollow fiber membrane, effectively improves pure water flux, and does not need adjustment of the membrane-making liquid film or the gel bath formula.

Description

【Technical field】 [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, in particular to a preparation method of a hollow fiber membrane with a large aperture and a production device for realizing the preparation method. 【Background technique】 [0002] With the development of industry, the amount and complexity of sewage production have also increased. MBR (membrane bioreactor) has been recognized by more people for replacing traditional processes to solve sewage problems, but in complex sewage environments, it becomes more complicated and sewage The composition and particle size of pollutants in the filter are various. According to different sewage conditions, hollow fiber membranes with different pore sizes are usually selected to obtain better filtration effect and lower filtration cost. [0003] However, the existing hollow fiber membranes have a small pore size, usually less than 0.10 micron, and it is difficult to control the size. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/34C02F1/44
CPCB01D69/08B01D67/0011B01D67/0016B01D71/34C02F1/44
Inventor 陈亦力彭兴峥代攀李锁定李新涛
Owner BEIJING ORIGIN WATER FILM TECH
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