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Hollow fiber film pressure resistance and water flux enhancing method

A fiber membrane, water flux technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problem of hollow fiber membrane compression resistance and high water flux cost, hollow fiber membrane compression resistance is limited, hollow fiber membrane The membrane water flux is limited and other problems, to achieve the effect of improving water flux, obvious effect, good application prospect and market prospect

Inactive Publication Date: 2019-02-12
SHENZHEN RES INST OF WUHAN UNIVERISTY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the hollow fiber membranes prepared by existing methods have limited pressure resistance and need to be enhanced by post-treatment. At the same time, the water flux of hollow fiber membranes is limited and need to be enhanced by post-treatment. , the existing technologies for increasing the pressure resistance and water flux of hollow fiber membranes have defects such as high cost, many steps, long time consumption, and complicated materials.

Method used

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  • Hollow fiber film pressure resistance and water flux enhancing method
  • Hollow fiber film pressure resistance and water flux enhancing method
  • Hollow fiber film pressure resistance and water flux enhancing method

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Embodiment 1

[0038] In this embodiment, polyimide and ethylene glycol are added to N-methylpyrrolidone, heated and stirred to make a mass fraction ratio of 22.8 / 8.2 / 69 (polyimide / ethylene glycol / N-methylpyrrolidone basepyrrolidone) homogeneous polymer solution, after filtration and defoaming, the spinning solution is obtained; water and N-methylpyrrolidone are prepared into the core coagulation liquid, wherein the mass fraction of water is 50%, and N-methylpyrrolidone The mass fraction is 50%; N-methylpyrrolidone is used as the outer coagulation solution; the spinning solution, the core coagulation solution, and the outer coagulation solution are extruded with a double-layer spinneret for spinning hollow fiber membranes, using non-solvent The first product of the hollow fiber membrane is solidified by the phase separation method, wherein the air layer height of the first product of the hollow fiber membrane is 1cm, the flow rate of the spinning solution is 1.2ml / min, the flow rate of the co...

Embodiment 2

[0040] In this embodiment, polyimide and ethylene glycol are added to N-methylpyrrolidone, heated and stirred to make a mass fraction ratio of 22.8 / 8.2 / 69 (polyimide / ethylene glycol / N-methylpyrrolidone basepyrrolidone) homogeneous polymer solution, after filtering and defoaming, a spinning solution is obtained; water, ethylene glycol and N-methylpyrrolidone are formulated into a central core coagulation solution, wherein the mass fraction of water is 36%, ethylene glycol The mass fraction of alcohol is 30%, and the mass fraction of N-methylpyrrolidone is 34%; N-methylpyrrolidone is used as the outer layer coagulation liquid; The membrane is extruded from a double-layer spinneret and solidified by a non-solvent phase separation method to obtain the primary product of the hollow fiber membrane. The coagulation liquid flow rate is 0.6ml / min, and the outer layer coagulation liquid flow rate is 0.2ml / min; the hollow fiber membrane is stretched in a water bath at a temperature of 25...

Embodiment 3

[0042] In this embodiment, polyimide and ethylene glycol are added to N-methylpyrrolidone, heated and stirred to make a mass fraction ratio of 22.8 / 8.2 / 69 (polyimide / ethylene glycol / N-methylpyrrolidone basepyrrolidone) homogeneous polymer solution, after filtering and defoaming, a spinning solution is obtained; water, ethylene glycol and N-methylpyrrolidone are formulated into a central core coagulation solution, wherein the mass fraction of water is 32%, ethylene glycol The mass fraction of alcohol is 40%, and the mass fraction of N-methylpyrrolidone is 28%; N-methylpyrrolidone is used as the outer layer coagulation liquid; The membrane is extruded from a double-layer spinneret and solidified by a non-solvent phase separation method to obtain the primary product of the hollow fiber membrane. The coagulation liquid flow rate is 0.6ml / min, and the outer layer coagulation liquid flow rate is 0.2ml / min; the hollow fiber membrane is stretched in a water bath at a temperature of 25...

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Abstract

The invention discloses a hollow fiber film pressure resistance and water flux enhancing method, which comprises the following steps of adding polymers and glycol into an organic solvent; performing heating stirring to obtain a uniform polymer solution; then performing filtering and antifoaming to obtain a spinning solution; preparing water, the glycol and the organic solvent into middle core solidification liquid; mixing and preparing the organic solvent and the water into outer layer solidification liquid, wherein the mass percentage of the organic solvent is 0 to 100 percent; extruding themiddle core solidification liquid, the spinning solution and the outer layer solidification liquid from three cavities including an inner cavity, a middle cavity and an outer cavity by a double-layerspinneret for spinning the hollow fiber film at the same time; performing curing by a non-solvent phase separation method to obtain a hollow fiber film primary product; performing water bath stretching on the hollow fiber film primary product at the stretching speed of 1.5 m / min to 30 m / min; performing water bath in the environment with the temperature being 20 to 99 DEG C to eliminate residual organic solvents and rest glycol so as to obtain the hollow fiber film with enhanced pressure resistance. The method has the characteristics that the steps are simple; the cost is reduced; the effect isobvious; convenience is realized; the implementation is easy, and the like.

Description

technical field [0001] The invention relates to a method for preparing a hollow fiber membrane, in particular to a method for enhancing the pressure resistance and water flux of the hollow fiber membrane. Background technique [0002] In the prior art, the polymer hollow fiber membrane has become an important separation membrane type in the membrane industry due to its continuous spinning process, stable and controllable filament output, and no need for an additional support layer. Hollow fiber membranes in gas separation (such as CO removal from exhaust gas 2 , CH 4 / NH 3 Mixed gas separation, etc.), liquid separation (sewage treatment, purification of pharmaceutical intermediates) and other aspects have applications. Polyamide ultra-thin composite hollow fiber membrane is a kind of membrane that performs interfacial polymerization on the base of hollow fiber porous layer to form an ultra-thin polyamide active layer to achieve separation. It is used in water treatment, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/08B01D71/16B01D71/34B01D71/42B01D71/56B01D71/64B01D71/68
CPCB01D67/0002B01D69/02B01D69/08B01D71/16B01D71/34B01D71/42B01D71/56B01D71/64B01D71/68B01D2325/36
Inventor 李雪蔡韬黄文刚
Owner SHENZHEN RES INST OF WUHAN UNIVERISTY