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A method for preparing a small-pore hydrophobic composite membrane for membrane distillation

A small pore size, composite membrane technology, applied in the field of membrane distillation, can solve the problems of poor hydrophobicity of micropore diameter, influence on separation effect, high osmotic resistance, etc., to achieve long-term stable operation, increase membrane distillation flux, ensure mechanical The effect of intensity

Active Publication Date: 2019-01-25
浙江海禹环保科技有限公司
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Problems solved by technology

Therefore, when dealing with high-salt feed liquid, inorganic salt molecules are easily adsorbed and deposited in the membrane pores due to the large pore diameter and poor hydrophobicity of the membrane material, and membrane pore wetting and pore blocking occur, thereby affecting the separation. effect; at the same time, the thickness of the microporous membrane is hundreds of microns, which has high permeation resistance, which limits the further improvement of membrane distillation flux

Method used

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  • A method for preparing a small-pore hydrophobic composite membrane for membrane distillation
  • A method for preparing a small-pore hydrophobic composite membrane for membrane distillation
  • A method for preparing a small-pore hydrophobic composite membrane for membrane distillation

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Embodiment 1-5

[0024] Mix 16.0wt% polysulfone and 84.0wt% N,N-dimethylacetamide, stir and heat to 80°C and keep it for 12h to obtain a uniform and transparent casting solution, and then put the casting solution in a 60°C Stand in the oven for 24 hours to fully mature and defoam, and then use; add dilute acetic acid solution dropwise to the ethanol water solution with a volume ratio of 1:1 to make the pH to 4.0, stir at 70°C for 30 minutes, and then add dropwise Silane coupling agent (methyltriethoxysilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, n-octyltriethoxysilane or γ-methyl) with a mass concentration of 5.0% acryloxypropyltrimethoxysilane), 0.05% hydroxy silicone oil, continue to stir for 30 minutes, and set aside; under the air atmosphere with a relative humidity of 60-80%, use a scraper to put the polysulfone casting solution on the PP nonwoven Spread the surface of the cloth to form a thin layer of 50 μm, soak it in deionized water after staying for 5 seconds, take it ou...

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Abstract

The invention relates to a preparation method of a small-pore-size hydrophobic composite membrane used for membrane distillation. The method includes the steps of: with polysulfone as a membrane material and N,N-dimethylacetamide as a solvent, heating and stirring the components to form a transparent membrane casting solution; in an ethanol water solution, preparing a hydrophobic modifying liquid containing a silane coupling agent and hydroxyl silicone oil; with a polypropylene nonwoven cloth as a reinforcing material, preparing a nascent state polysulfone microporous membrane through a phase inversion process; soaking the nascent state polysulfone microporous membrane in the hydrophobic modifying liquid, and performing thermal treatment to produce the polysulfone microporous membrane having excellent hydrophobicity. With the polypropylene nonwoven cloth as the reinforcing material, through the phase separation-surface modification process, the pore diameter of the composite membrane is small and has narrow distribution. Hydrophobization of membrane surface is achieved and a membrane distillation process can be operated stably for a long time. The preparation method is simple. The small-pore-size hydrophobic composite membrane has wide applications.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic composite membrane with a small pore size, which belongs to the technical field of separation membrane preparation. The composite membrane has the advantages of small pore diameter, narrow pore size distribution, and good hydrophobic performance, and is suitable for membrane distillation and other fields. Background technique [0002] Membrane distillation is a membrane separation process driven by vapor pressure difference. The high-temperature feed liquid is separated from the low-temperature permeate through a hydrophobic microporous membrane. The vapor pressure measured by the high-temperature feed liquid is higher than that of the low-temperature permeate. The vapor pressure forces the vapor molecules to migrate from the feed liquid side to the permeate liquid side, thereby realizing the separation of the feed liquid. Due to its small equipment size, low operating pressure and almost al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/36
CPCB01D61/364B01D67/0002B01D69/12B01D2325/38
Inventor 俞三传吕振华刘梅红
Owner 浙江海禹环保科技有限公司
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