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Method for preparing alcohol permselective silicon rubber composite membrane

A silicone rubber composite membrane, a technology that preferentially penetrates alcohol, is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., and can solve the problems of ethanol separation selectivity and low permeation flux, difficult to achieve industrial applications, and film-forming properties. , poor mechanical properties and other issues, to achieve the effect of good industrial application prospects

Active Publication Date: 2011-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the many preferred alcohol-permeable membrane materials, polydimethylsiloxane is the most researched and most promising one because of its rubbery state, high free volume fraction, strong hydrophobicity, and low cost. Alcohol-permeable membrane material, but its own film-forming and mechanical properties are poor, and the separation selectivity and permeation flux to ethanol are low. Currently, the separation factor of pure PDMS membrane for ethanol aqueous system is 4.4 to 4.4. Within the range of 10.8, it is difficult to meet the needs of industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing a preferential alcohol-permeable silicone rubber composite film, comprising the following steps:

[0017] 1) Prepare a PVDF porous bottom membrane, dissolve PVDF in an organic solvent, prepare a PVDF solution with a concentration of 15wt%, stir evenly at 70°C, filter, defoam, scrape the membrane on a polyester non-woven fabric, and the water is a gel Bath, using the immersion precipitation phase inversion method to obtain the PVDF porous bottom membrane supported by non-woven fabric, after the solvent exchange is complete, let it dry naturally,

[0018] The organic solvent is triethyl phosphate, and the polyester non-woven fabric is a full polyester non-woven fabric of model NAS-222;

[0019] 2) To prepare silicone rubber film liquid, mix liquid silicone rubber containing vinyl, hydrogen-containing silicone oil, MQ silicone resin, chloroplatinic acid solution, nano-silica and solvent, stir evenly, filter and defoam, and vinyl liquid silicon Rubbe...

Embodiment 2

[0024] A method for preparing a preferential alcohol-permeable silicone rubber composite film, comprising the following steps:

[0025] 1) Prepare a PVDF porous bottom film, dissolve PVDF in an organic solvent, prepare a PVDF solution with a concentration of 12wt%, stir evenly at 70°C, filter, defoam, scrape the film on a polyester non-woven fabric, and the water is a gel Bath, using the immersion precipitation phase inversion method to obtain the PVDF porous bottom membrane supported by non-woven fabric, after the solvent exchange is complete, let it dry naturally,

[0026] The organic solvent is N, N-dimethylformamide, and the polyester non-woven fabric is a full polyester non-woven fabric of model NAS-222;

[0027] 2) To prepare silicone rubber film liquid, mix liquid silicone rubber containing vinyl, hydrogen-containing silicone oil, MQ silicone resin, chloroplatinic acid solution, nano-silica and solvent, stir evenly, filter and defoam, and vinyl liquid silicon Rubber: h...

Embodiment 3

[0032] A method for preparing a preferential alcohol-permeable silicone rubber composite film, comprising the following steps:

[0033] 1) Prepare a PVDF porous bottom membrane, dissolve PVDF in an organic solvent, prepare a PVDF solution with a concentration of 18wt%, stir evenly at 70°C, filter, defoam, scrape the membrane on a polyester non-woven fabric, and the water is a gel Bath, using the immersion precipitation phase inversion method to obtain the PVDF porous bottom membrane supported by non-woven fabric, after the solvent exchange is complete, let it dry naturally,

[0034] The organic solvent is N-methylpyrrolidone, and the polyester non-woven fabric is a full polyester non-woven fabric of model NAS-222;

[0035] 2) To prepare silicone rubber film liquid, mix liquid silicone rubber containing vinyl, hydrogen-containing silicone oil, MQ silicone resin, chloroplatinic acid solution, nano-silica and solvent, stir evenly, filter and defoam, and the vinyl liquid silicon ...

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Abstract

The invention relates to a method for preparing an alcohol permselective silicon rubber composite membrane, comprising the following steps of: firstly preparing a PVDF (polyvinylidene fluoride) porous base membrane, dissolving PVDF in an organic solvent to prepare a PVDF solution, stirring to be uniform, filtering, defoaming, wiping a membrane on a polyester non-woven fabric, carrying out a gel bath with water, obtaining a non-woven fabric supported PVDF porous base membrane by adopting an immersion sedimentation phase inversion method, and drying in the air after solution exchange is complete; then preparing a silicon rubber membrane solution, namely mixing liquid silicon rubber containing vinyl, silicon oil containing hydrogen, MQ silicon resins, a chloroplatinic acid solution, nano silicon dioxide and a solvent, stirring to be uniform, filtering and defoaming; and finally preparing the silicon rubber composite membrane, namely coating the membrane solution on the PVDF porous supported base membrane, and carrying out deep crosslinking to obtain an addition-type silicon rubber composite membrane. The composite membrane provided by the invention breaks through the optimal separating property of the traditional pure silicon rubber membrane, has an excellent pervaporation alcohol permselective effect and also has a large-scale industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of pervaporation membrane separation, in particular to a method for preparing an alcohol-preferred permeable silicone rubber composite membrane. Background technique [0002] The separation of ethanol / water mixture is of great significance to the production of renewable new energy-bio-ethanol fuel, especially the separation and extraction of low-concentration ethanol from fermentation broth to ensure the continuous production of bio-ethanol fuel has become a worldwide concern hot and cutting-edge issues. [0003] The coupling of pervaporation membrane separation technology and biological fermentation can solve the problem of product inhibition and realize the continuous production of bioethanol. Its outstanding advantages are: typical energy-saving technology, that is, low energy consumption, generally 1 / 2 to 3 times less energy than azeotropic distillation / 4; typical clean production technology, that is, ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/12
Inventor 李继定展侠陈剑樊铖
Owner TSINGHUA UNIV
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