Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A novel double-layer hollow fiber membrane for membrane distillation and its preparation method and application

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 membrane flux, better morphology, and orderly arrangement of membrane pores

Active Publication Date: 2021-12-14
CENT SOUTH UNIV
View PDF10 Cites 0 Cited by
  • 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
[0006] 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A novel double-layer hollow fiber membrane for membrane distillation and its preparation method and application
  • A novel double-layer hollow fiber membrane for membrane distillation and its preparation method and application
  • A novel double-layer hollow fiber membrane for membrane distillation and its preparation method and application

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a novel double-layer hollow fiber membrane for membrane distillation and its preparation method and application. The double-layer hollow fiber membrane has a hydrophilic layer as an inner layer and a hydrophobic layer as an outer layer. Contain PVDF in the cast film liquid, comprise P(VDF-co-HFP) in the cast film liquid of outer layer, its preparation method is: core liquid, inner layer cast film liquid, outer layer cast film liquid from three-hole spinneret spray out, and then pass through the first outer gel bath and the second outer gel bath for phase transformation to obtain a double-layer hollow fiber membrane after soaking and freeze-drying; the first outer gel bath is alcohol water The mixed solution, the second external gel bath is water, the invention is simple and easy to operate, the material has good film-forming properties, the prepared hollow fiber membrane has a uniform structure, the membrane pores are arranged in an orderly manner, and a relatively high temperature can be obtained during the membrane distillation process. good flux.

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 technical background [0002] 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. [0003] Membrane distillation (MD) is an emerging physical separation technique that has received researchers' attention over the past few decades. Membran...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com