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Priority dealcoholization PDMS/PVDF multi-layer compound film and preparation method thereof

A multi-layer composite membrane and preferential dealcoholization technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low strength of separation membrane, high production cost, limited application, etc., and achieve simple production process , the effect of low production cost

Inactive Publication Date: 2008-03-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"A Pervaporation Separation Membrane for Separating Liquid Mixtures" (US5254251) discloses a preparation method of a double-layer composite membrane. The selection layer is a polyether-polyamide block copolymer, and the reinforcement matrix layer is a silk screen. The matrix strength Higher, selectivity and permeation flux are also greatly improved, but the production cost of polyether-polyamide copolymer is relatively high, which limits its large-scale industrial application
"Method for Separating Ethanol Aqueous Solution Using Polyvinylidene Fluoride Pervaporation Membrane" (CN1239012A) discloses a method of using vinylidene fluoride to prepare a preferential alcohol permeation membrane, but the separation membrane has low strength, poor pressure resistance, and separation The concentration of ethanol in membrane separation is limited between 0.1wt% and 20wt%, which limits its industrial application
"A Preparation Method for Preferential Dealcoholization Separation Membrane" (CN1640534A) discloses a method for preparing cyclosiloxane preferential dealcoholization separation membrane by means of concentrated emulsion polymerization, but the polymer preparation process is relatively complicated, and its separation system Limited to 25vol% ethanol aqueous solution, its permeation flux is only 36.2-100.3g / m 2 h, which greatly limits its application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Dissolve 6g of PVDF in 34g of triethyl phosphate (TEP) to make a solution with a concentration of 15wt%, stir evenly at 70°C, filter, defoam, and scrape the film directly on one side of the polyester non-woven fabric, water is Gel bath, using the immersion precipitation phase inversion method to obtain a PVDF porous base film supported by non-woven fabrics, with a thickness of 45 μm. After the solvent exchange is complete, soak the base film with ethanol for 5 minutes and dry it naturally; then use the same method on the non-woven Cloth another test to prepare the porous base film, soak it in ethanol for 5min, and let it dry naturally.

[0021] 2) Dissolve 6g of PDMS with a viscosity of 50,000, 0.5g of phenyltrimethoxysilane, and 0.2g of dibutyltin dilaurate as a catalyst in n-heptane, and prepare a solution with a concentration of 30wt%, and stir evenly. Before gelling, place the PVDF base film supported by non-woven fabric in the film liquid for 10 seconds, take it...

example 2~4

[0028] Examples 2-4 investigated the relationship between different film-making conditions and film properties of PDMS / PVDF multilayer composite film, see Table 3. All the other conditions are with embodiment 1.

[0029] Table 3 Example 2~4 film preparation conditions and performance list

[0030] instance number

[0031] Film thickness (μm)

[0032] The change law of the separation factor and permeation flux of the PDMS / PVDF multilayer composite membrane with temperature and concentration in Examples 2-4 is the same as that of Example 1.

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Abstract

The invention relates to an ethanol-permselective PDMS / PVDF multilayered composite membrane and the preparation method, which belongs to a pervaporation membrane separation field. The multilayered composite membrane is made based on the following processes: firstly, the PVDF porous basal membrane is prepared by a two-faced wiped film of kynoar polyvinylindene fluoride (PVDF) solution on the polyester non-woven fabric support layer using submersion and sedimentation transformation method; secondly, the membrane liquid, which contains dimethyl silicone polymer (PDMS), cross linking agent and catalyst, is prepared, and the PVDF porous basal membrane is immersed in the membrane liquid for 10s-1min. Each of two sides of the PVDF basal membrane are coated with a layer of silicone base by using immersion and painting method, and then the PVDF basal membrane is dried and cross linked, and so the multilayered composite membrane is made. The existing pure PDMS membrane has bad separability to ethanol aqueous solution, and the highest separation factor is 10.8 ([EtOH] equals to 8wt percent, 30 DGE C). The multilayered symmetrical composite membrane made of the invention has an excellent ethanol-permselective property to low concentration ethanol aqueous solution (5wt percent-30wt percent), and for the ethanol aqueous solution which has a concentration of 5wt percent, the separation factor ¿” value equals to 15, and the permeation flux J equals to 450g / m2h, under the temperature of 60 DGE C.

Description

technical field [0001] The invention relates to a PDMS / PVDF multi-layer composite membrane which can be used for pervaporation preferentially permeating alcohol and a preparation method thereof, belonging to the field of pervaporation membrane separation. Background technique [0002] With the advent of the global energy crisis and environmental crisis, people are forced to seek new energy sources to replace non-renewable energy sources such as petroleum. Among them, alcohol biofuel, as a clean energy source, can not only replace traditional petroleum energy sources, but also greatly reduce pollution of the environment. At present, developed countries such as Europe, America and Japan have replaced part of petroleum with bioethanol to varying degrees, and are committed to large-scale production of bioethanol fuel to solve the energy crisis. [0003] In the process of producing ethanol by biological fermentation, with the increase of ethanol concentration in the fermenter (5...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/70B01D71/34
Inventor 李继定展侠叶宏林阳政
Owner TSINGHUA UNIV
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