Self-dehydration hydrophobic separation membrane and preparation method

A separation membrane, hydrophobic technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of difficult engineering implementation method, uneven drying degree, difficult engineering application, etc., to reduce separation The effect of mass transfer resistance, large contact angle and strong mechanical strength

Inactive Publication Date: 2015-01-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of hot air blowing and drying has low efficiency and uneven drying degree, so it cannot be applied to large-sized membrane modules
If the membrane module is placed in a special vacuum oven and heat

Method used

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  • Self-dehydration hydrophobic separation membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 100 grams of polyvinylidene fluoride particles (attached figure 1 3 in 3, particle size 2 ~ 5μm, Sanaifu company, brand F904), stirring and dispersing in 2000 grams of dispersant absolute ethanol, to obtain polyvinylidene fluoride particle suspension; Aperture (attached figure 1 In 2) a hydrophilic polyvinylidene fluoride porous membrane of 0.2 μm (attached figure 1 1) in the outer surface. The hydrophilic polyvinylidene fluoride porous membrane coated with the polyvinylidene fluoride particle suspension was taken out from the ultrafiltration coating device, dried in air at room temperature, and then placed in an oven at 85°C for 4 hours to make The outer surface of the hydrophilic polyvinylidene fluoride porous membrane forms a hydrophobic polyvinylidene fluoride particle separation membrane layer with a micro-nano concave-convex structure. The thickness of the hydrophobic polyvinylidene fluoride particle separation membrane layer is 20 μm, and the pore size of the s...

Embodiment 2

[0039] 60 grams of polyvinylidene fluoride particles (particle size 80 ~ 100nm, self-made), stirred and dispersed in a mixed solvent of 1000 grams of dispersant acetone and 400 grams of ethyl acetate to obtain a suspension of polyvinylidene fluoride particles; then ultrafiltration coating It is coated on the outer surface of a hydrophilic polyvinylidene fluoride porous membrane with a thickness of 200 μm and a pore size of 0.2 μm. The hydrophilic polyvinylidene fluoride porous membrane coated with the polyvinylidene fluoride particle suspension is taken out from the ultrafiltration coating device, and dried in air at room temperature, so that the outer surface of the hydrophilic polyvinylidene fluoride porous membrane forms Hydrophobic polyvinylidene fluoride particle separation membrane layer with micro-nano concave-convex structure, the thickness of the hydrophobic polyvinylidene fluoride particle separation membrane layer is 20 μm, the pore size of the separation membrane is...

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Abstract

The invention discloses a self-dehydration hydrophobic separation membrane and a preparation method. The surface of a hydrophilic membrane is coated with polyvinylidene fluoride particles so as to form the self-dehydration hydrophobic separation membrane with a micro nano grade convex-concave structure. The preparation method comprises the following steps: preparing the polyvinylidene fluoride particles into turbid liquid; performing ultra-filtration so as to enable the the surface of the hydrophilic polyvinylidene fluoride porous membrane-based membrane to be coated with the polyvinylidene fluoride turbid liquid; drying the hydrophilic polyvinylidene fluoride porous membrane-based membrane coated with the polyvinylidene fluoride turbid liquid so as to obtain the self-dehydration hydrophobic separation membrane. The self-dehydration hydrophobic separation membrane is sufficient in mechanical strength and has a self-dehydration function, once being dissociated from an aqueous solution, the surface of the hydrophobic separation membrane can be automatically dried, so that the purpose of drying the hydrophobic separation membrane pores is realized; the hydrophobic layer of the hydrophobic separation membrane is thin, the surface pure water contact angle of the hydrophobic separation membrane is large, the separation mass transfer resistance can be effectively alleviated, the separation efficiency is improved, and the large-scale industrialization application of a membrane separation technique is facilitated.

Description

technical field [0001] The invention relates to membrane separation technology, in particular to a membrane distillation equipment suitable for seawater desalination, high-salinity wastewater treatment, reverse osmosis concentrated water treatment, etc. in the field of water treatment. Self-dehydrating hydrophobic separation membrane and preparation method in membrane absorption equipment such as extraction, and other membrane separation equipment involving hydrophobic porous separation membrane in water phase / gas phase separation. Background technique [0002] The material structure of the separation membrane has an important influence on the performance of the separation membrane. For the membrane separation process of the hydrophobic separation membrane used in membrane distillation, membrane absorption, etc., during the separation process, no liquid phase substances pass through the membrane pores, only gaseous substances Substances pass through the pores of the membrane...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 吕晓龙陈华艳程认认张如意倪文彧武春瑞高启君
Owner TIANJIN POLYTECHNIC UNIV
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