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Novel double-layer hollow-fiber membrane for membrane distillation, preparation method therefor and application of novel double-layer hollow-fiber membrane

A double-layer hollow, fiber membrane technology, used in chemical instruments and methods, membranes, pervaporation, etc., can solve the problem of poor adhesion between inner and outer layers, inconsistent hydrophobic/hydrophilic properties, and reduced temperature polarization effects, etc. problem, to achieve the effect of excellent hydrophilicity, orderly arrangement of membrane pores, and improved hydrophobicity

Active Publication Date: 2019-08-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the temperature polarization effect is reduced due to the thicker hydrophilic sublayer
[0007] However, due to the inconsistent hydrophobic / hydrophilic properties of the inner and outer layers, the polymers used for the inner and outer layers are different, and delamination may occur during the spinning process, and the boundaries of the inner and outer layers cannot be well bonded.

Method used

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  • Novel double-layer hollow-fiber membrane for membrane distillation, preparation method therefor and application of novel double-layer hollow-fiber membrane
  • Novel double-layer hollow-fiber membrane for membrane distillation, preparation method therefor and application of novel double-layer hollow-fiber membrane
  • Novel double-layer hollow-fiber membrane for membrane distillation, preparation method therefor and application of novel double-layer hollow-fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] ① Preparation of inner and outer layer casting solution, core solution and outer gel bath

[0058] The inner layer casting liquid adopts polyvinylidene fluoride (PVDF6020), additive polyvinyl alcohol (PVA), solvent N-methylpyrrolidone (NMP) three substances by weight percentage 10wt%, 0.5wt%, 89.5wt% at 60 ℃ Mix evenly; the outer casting solution is made of polyvinylidene fluoride-hexafluoropropylene (P(VDF-co-HFP)), additive ethylene glycol (EG), solvent N,N-dimethylacetamide (DMAc) A kind of material is mixed uniformly at 60 ℃ by weight percent 15wt%, 5wt%, 80wt%; The composition of core liquid is the mixture of ethanol and water, and its weight percent is formulated by 50 / 50wt%; The composition of the first outer gel bath is The mixture of ethanol and water, its weight percent is prepared by 10 / 90wt%, the second outer gel bath is water.

[0059] ②Spinning of hollow fiber membrane

[0060] The core liquid, the inner layer casting liquid and the outer layer casting l...

Embodiment 2

[0065] Compared with Example 1, adjust the flow rate of casting liquid, core liquid and the first outer gel bath, specifically as follows:

[0066] ① Preparation of casting solution, core solution and outer gel bath

[0067] The inner layer casting solution is made of polyvinylidene fluoride (PVDF6020), additive polyvinylpyrrolidone (PVP), solvent N-methylpyrrolidone (NMP) and mixed at 60°C by weight percentage of 13wt%, 8wt%, 79wt% Uniform; the outer casting film uses polyvinylidene fluoride-hexafluoropropylene (P(VDF-co-HFP)), additive ethylene glycol (EG), solvent N,N-dimethylacetamide (DMAc) three substances 13wt%, 12wt%, and 75wt% were uniformly mixed at 60°C by weight percentage; the composition of the core liquid was a mixture of N-methylpyrrolidone, ethanol and water, and its weight percentage was 5wt%, 10wt%, 85wt%. The composition of the gel bath is a mixture of ethanol and water, and its weight percentage is formulated according to 20 / 80wt%, and the second outer ge...

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Abstract

The invention discloses a novel double-layer hollow-fiber membrane for membrane distillation, a preparation method therefor and an application of the novel double-layer hollow-fiber membrane. The double-layer hollow-fiber membrane takes a hydrophilic layer as an inner layer and takes a hydrophobic layer as an outer layer, a membrane casting solution of the inner layer contains PVDF (polyvinylidenefluoride), and a membrane casting solution of the outer layer contains P(VDF-co-HFP). The preparation method for the double-layer hollow-fiber membrane comprises the steps of jetting a core solution,the inner-layer casting solution and the outer-layer casting solution from a three-hole spinneret, then, carrying out phase change molding sequentially through a first outer gel bath and a second outer gel bath, and subjecting obtained membrane filaments to soaking and freeze drying, thereby obtaining the double-layer hollow-fiber membrane, wherein the first outer gel bath contains an alcohol-water mixed solution, and the second outer gel bath contains water. According to the novel double-layer hollow-fiber membrane for membrane distillation, the preparation method therefor and the application of the novel double-layer hollow-fiber membrane, the operation is simple and easy, the material film forming property is good, the prepared hollow-fiber membrane is uniform in membrane filament structure and ordered in membrane hole arrangement, and relatively good flux can be obtained during membrane distillation.

Description

technical field [0001] The invention belongs to the field of hollow fiber membrane preparation and application, in particular to a novel double-layer hollow fiber membrane used for membrane distillation and its preparation method and application [0002] technical background [0003] As we all know, the shortage of fresh water resources has become a major social problem, and seawater desalination is one of the ways to solve this problem. At present, the main methods to obtain fresh water through seawater or brackish water are: evaporation, electrodialysis, reverse osmosis Membrane distillation technology combined with distillation method and membrane method, which has been developed rapidly in recent years, has been continuously applied in seawater desalination, providing a new way to solve the shortage of fresh water resources. [0004] Membrane distillation (MD) is an emerging physical separation technique that has received researchers' attention over the past few decades. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/02B01D71/34B01D71/32B01D67/00B01D61/36C02F1/44C02F103/08
CPCB01D69/08B01D69/02B01D71/34B01D71/32B01D67/0011B01D61/364C02F1/447B01D2325/24B01D2325/36B01D2325/38C02F2103/08Y02A20/131
Inventor 欧阳金桃蒋兰英
Owner CENT SOUTH UNIV
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