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Hydrophobic separation membrane and preparation method

A hydrophobic, separation membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low efficiency, high energy consumption, difficult to achieve engineering applications, etc. Drying problem, the effect of promoting large-scale industrial application

Inactive Publication Date: 2012-08-29
TIANJIN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the membrane pores of the hydrophobic separation membrane are hydrophilized during use, usually the membrane can only be dried by heating and air drying, which has high energy consumption and low efficiency, making it difficult to realize engineering applications

Method used

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  • Hydrophobic separation membrane and preparation method
  • Hydrophobic separation membrane and preparation method
  • Hydrophobic separation membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare a coating solution, stir and dissolve polyvinylidene fluoride resin (Solef, 6010) and propylene glycol in dimethylacetamide solvent to obtain 1.5wt% polyvinylidene fluoride, 30wt% propylene glycol, and 68.5wt% dimethylacetamide After degassing, the coating solution is coated on the outer surface of a dry hydrophilic polyvinylidene fluoride hollow fiber microporous membrane with a pore size of 0.2 μm, and after being exposed to air for 30 seconds, it is solidified in water to form a film. The thickness of the hydrophobic layer of the obtained polyvinylidene fluoride hydrophobic membrane was 1.1 μm, the membrane separation pore size was still 0.20 μm, and the contact angle on the outer surface of the hollow fiber membrane was 163 degrees. The contact angle of the outer surface of the hydrophilic polyvinylidene fluoride hollow fiber base membrane is 57 degrees.

Embodiment 2

[0041] Stir and dissolve 10 grams of fluorosilicone rubber (Shanghai Sanaifu Company, FE2801) and 990 grams of methyl ethyl ketone, and defoam to prepare a casting solution. The casting solution is coated on the inner surface of a polyethersulfone hollow fiber membrane with a pore diameter of 0.2 μm and a thickness of 0.25 mm, and solidified in water to form a membrane. The membrane separation pore diameter of the obtained hydrophobic membrane was 0.20 μm, the thickness of the hydrophobic layer was 2.0 μm, and the contact angle of the inner surface of the hollow fiber membrane was 151 degrees. The contact angle of the inner surface of the polyethersulfone hollow fiber base membrane is 54 degrees.

Embodiment 3

[0043] 10 grams of fluororubber (Shanghai Sanaifu Company, FE2651) and 990 grams of methyl ethyl ketone were stirred and dissolved evenly, and defoaming was performed to prepare a casting solution. The casting solution is coated on the inner surface of a polysulfone hollow fiber membrane with a pore size of 0.2 μm, and solidified in water to form a membrane. The membrane separation pore diameter of the obtained hydrophobic membrane was 0.20 μm, the thickness of the hydrophobic layer was 2.0 μm, and the contact angle of the inner surface of the hollow fiber membrane was 137 degrees. The contact angle of the inner surface of the polysulfone hollow fiber base membrane is 58 degrees.

[0044] Description of vacuum membrane distillation experiment system

[0045] The process flow of the vacuum membrane distillation experimental system is as follows: figure 1 As shown, the system is mainly composed of two loops on the hot side and vacuum side and polyvinylidene fluoride hydrophobi...

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Abstract

The invention discloses a hydrophobic separation membrane which has a self-dehydrating effect. The hydrophobic porous separation membrane coats a hydrophobic coating material with the thickness of 100 micrometers to 20 micrometers on the surface of a hydrophilic ultrafiltration / microfiltration base membrane or a hydrophobic macroporous microfiltration base membrane to form a hydrophobic surface layer; the aperture range of the hydrophobic porous separation membrane is 0.01-2 micrometers; the thickness of the base membrane is 20-800 micrometers; a contact angle of the hydrophobic surface layer and water is 100-179 degrees; and preferably, the thickness of the hydrophobic surface layer coated on the surface of the base membrane is 150 micrometers to 2 micrometers. The invention further discloses a preparation method of the hydrophobic separation membrane and a using method of the hydrophobic separation membrane.

Description

technical field [0001] The invention relates to a method for preparing a hydrophobic porous separation membrane and a method for using the same. The hydrophobic porous separation membrane has a self-dehydration effect and is suitable for membranes such as seawater desalination, high-salinity wastewater treatment, and reverse osmosis concentrated water treatment in the field of water treatment. In distillation equipment, it is also suitable for membrane absorption equipment such as wastewater deamination, water degassing, bromine extraction, and other membrane separation equipment involving the use of hydrophobic porous separation membranes in water phase / gas phase separation. Background technique [0002] Membrane distillation has attracted worldwide attention and research in recent years. Compared with ordinary evaporators, one of the most notable features of membrane distillation is that the evaporation area per unit volume is large, so that the device can operate efficien...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D61/36
Inventor 吕晓龙
Owner TIANJIN POLYTECHNIC UNIV
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