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Preparation method of high-hydrophobicity polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride, high hydrophobic technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low porosity, can not meet high flux, etc., to improve hydrophobicity, improve anti-wetting ability, the effect of improving mechanical strength

Inactive Publication Date: 2016-08-17
NORTHEAST DIANLI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of the membrane produced by this method is dense and the porosity is low, which cannot meet the requirements of high flux.

Method used

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  • Preparation method of high-hydrophobicity polyvinylidene fluoride hollow fiber membrane
  • Preparation method of high-hydrophobicity polyvinylidene fluoride hollow fiber membrane
  • Preparation method of high-hydrophobicity polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of PVDF casting solution: place 0.5g of nano-silica and 3g of polyvinylpyrrolidone (K30) in 84.5g of N,N-dimethylformamide (DMF) in proportion, first ultrasonically disperse for 2 hours, and then continue at a constant speed Stir mechanically for 10 hours to obtain a base solution, dissolve 13 g of PVDF in the base solution, heat in a constant temperature water bath at 50°C, and stir mechanically for 10 hours to obtain a casting solution.

[0032] PVDF hollow fiber membrane spinning process: place the prepared casting liquid in the slurry tank of the spinning machine, vacuum remove the residual air in the casting liquid at a constant temperature of 50°C, and then let it stand for 12 hours to remove the casting film Air bubbles in the liquid, a hollow fiber liner is installed in the spinneret of the spinning machine, the extrusion rate of the cast film liquid is adjusted to 4mL / min, the extrusion rate of the liner is 1m / min, the air distance is adjusted to 10c...

Embodiment 2

[0036]Preparation of PVDF casting solution: place 1g of nano-silica and 4g of polyvinylpyrrolidone (K30) in 82g of N,N-dimethylformamide (DMF), ultrasonically disperse for 3 hours, and then continue to stir mechanically at a uniform speed After 12 hours, the base solution was obtained, and 14 g of PVDF was dissolved in the base solution, heated in a constant temperature water bath at 60° C., and mechanically stirred for 12 hours to obtain a casting solution.

[0037] PVDF hollow fiber membrane spinning process: place the prepared casting liquid in the slurry tank of the spinning machine, vacuum remove the residual air in the casting liquid at a constant temperature of 60°C, and then let it stand for 16 hours to remove the casting film bubbles in the liquid. Install a hollow fiber liner in the spinneret of the spinning machine, adjust the extrusion rate of the casting liquid to 6mL / min, the extrusion rate of the liner to 2m / min, and adjust the air gap to 10cm to carry out spinn...

Embodiment 3

[0041] Preparation of PVDF casting solution: put 1.5g of nano-titanium dioxide and 5g of polyethylene glycol-400 (PEG400) in 79.5g of N,N-dimethylacetamide (DMAC), ultrasonically disperse for 4 hours, and then continue at a constant speed Stir mechanically for 14 hours to obtain a base solution, dissolve 15 g of PVDF in the base solution, heat in a constant temperature water bath at 70°C, and stir mechanically for 14 hours to obtain a casting solution.

[0042] PVDF hollow fiber membrane spinning process: place the prepared casting solution in the slurry tank of the spinning machine, vacuum remove the residual air in the casting solution at a constant temperature of 70°C, and then let it stand for 24 hours to remove the casting film bubbles in the liquid. Install the hollow fiber liner in the spinneret of the spinning machine, adjust the extrusion rate of casting liquid to 8mL / min, the extrusion rate of the liner to 3m / min, and adjust the air distance to 15cm to carry out spin...

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Abstract

The invention relates to the technical field of gas separation membranes, and discloses a preparation method of a high-hydrophobicity polyvinylidene fluoride hollow fiber membrane. The preparation method of the high-hydrophobicity polyvinylidene fluoride hollow fiber membrane is characterized by comprising the following steps: preparation of a polyvinylidene fluoride (PVDF) membrane casting solution, a spinning process of the polyvinylidene fluoride hollow fiber membrane, curing and film forming processes, hydrophobic modification of the polyvinylidene fluoride membrane, and preparation of a finished product. The PVDF hydrophobic membrane gives consideration to both PDVF and excellent performance of the favorable wetting resistance, has a relatively good air flux, is greatly improved in air flux, mass transfer coefficient and the like in comparison with an existing hydrophobic membrane material, and is simple in preparation technique, low in cost and easy for realizing scale production. The preparation method of the high-hydrophobicity polyvinylidene fluoride hollow fiber membrane is applicable to a membrane for absorbing and capturing carbon dioxide in a coal-fired flue gas.

Description

technical field [0001] The invention belongs to the technical field of membranes for gas separation, and relates to a method for preparing a highly hydrophobic polyvinylidene fluoride hollow fiber membrane, which is used for capturing CO in coal-fired flue gas in a membrane absorption process. 2 . Background technique [0002] Currently, CO emissions from anthropogenic activities 2 The increase intensified the greenhouse effect, causing global warming, increased pests and diseases, and desertification of land, which seriously threatened the health and survival of humans, animals and plants. Therefore, it is urgent to take effective measures to reduce CO 2 emissions to mitigate the greenhouse effect. [0003] Membrane absorption method is the most economical and environmentally friendly in the existing carbon capture. Among the existing membrane materials for membrane absorption, polyvinylidene fluoride (PVDF) has good mechanical stability, chemical resistance, weather res...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D69/12B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D69/08B01D69/12B01D71/34B01D2257/504B01D2325/38
Inventor 张瑛洁袁龙飞崔学军
Owner NORTHEAST DIANLI UNIVERSITY
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