Method for preparing pervaporation membrane for separating alcohol-water system

A pervaporation membrane and system technology, applied in the field of pervaporation membrane preparation, can solve the problems of violating the strategic requirements of sustainable development, unstable product quality, shortage of food supply, etc., achieve stable separation performance, simple and feasible method, easy-to-handle effects

Inactive Publication Date: 2008-09-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Multi-purpose batch fermentation process, low productivity, huge equipment, unstable product quality;
[0006] (2) The current international food supply is in short supply, and the method of fermenting and producing ethanol with agricultural products as the main raw material violates the country's strategic requirements for sustainable development;
[0007] (3) Fermentation methods generally can only produce dilute ethanol solutions below 8%-10%, and ethanol as a product has a ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, a kind of preparation method that is used to separate the pervaporation membrane of alcohol-water system, carries out following steps successively:

[0030] 1) Put 5g of polydimethylsiloxane (PDMS) and 150mL of n-hexane into the container, and stir thoroughly for 2 hours;

[0031] 2) Then, add 0.5 g of propyl orthosilicate and 0.1 g of monobutyltin dilaurate into the container, and fully stir and react at room temperature for 2 hours to obtain a mixed solution;

[0032] 3), then the above-mentioned mixed solution is successively filtered, defoamed, and rested; on the bottom membrane of the PAN (polyacrylonitrile) ultrafiltration membrane, the film is scraped with a scraper knife to obtain a membrane embryo with a thickness of 150 μm;

[0033] 4) First vulcanize the above-mentioned membrane embryo at room temperature for 48 hours, let the solvent evaporate at room temperature; then put the membrane embryo into a drying oven at 110°C for further high-tempera...

Embodiment 2

[0041] Embodiment 2, a kind of preparation method that is used to separate the pervaporation membrane of alcohol-water system, carries out following steps successively:

[0042] 1) Put 5g of polydimethylsiloxane (PDMS) and 150mL of n-octane into the container, and stir thoroughly for 2 hours;

[0043] 2) Then, add 0.5 g of propyl orthosilicate and 0.1 g of monobutyltin dilaurate into the container, and fully stir and react at room temperature for 2 hours to obtain a mixed solution;

[0044] 3), then the above-mentioned mixed solution is successively filtered, defoamed, and rested; on the bottom membrane of the PAN (polyacrylonitrile) ultrafiltration membrane, the film is scraped with a scraper knife to obtain a membrane embryo with a thickness of 150 μm;

[0045] 4) First vulcanize the above-mentioned membrane embryo at room temperature for 48 hours, let the solvent evaporate at room temperature; then put the membrane embryo into a drying oven at 110°C for further high-tempera...

Embodiment 3

[0053] Embodiment 3, a kind of preparation method that is used to separate the pervaporation membrane of alcohol-water system, carries out following steps successively:

[0054] 1) Put 5g of polydimethylsiloxane (PDMS) and 150mL of n-hexane into the container, and stir thoroughly for 2 hours;

[0055] 2), then add 0.5g ethyl orthosilicate and 0.1g dibutyltin dilaurate into the container, fully stir and react at room temperature for 2 hours to obtain a mixed solution;

[0056] 3), then the above-mentioned mixed solution is successively filtered, defoamed, and rested; on the bottom membrane of the PAN (polyacrylonitrile) ultrafiltration membrane, the film is scraped with a scraper knife to obtain a membrane embryo with a thickness of 150 μm;

[0057] 4) First vulcanize the above-mentioned membrane embryo at room temperature for 48 hours, let the solvent evaporate at room temperature; then put the membrane embryo into a drying oven at 110°C for further high-temperature vulcanizat...

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Abstract

The invention discloses a preparation method of an infiltration vaporizable membrane used for an alcohol-water separation system, comprising the following steps: (1) polydimethyl siloxane and solvent are put into a vessel and are stirred; (2) cross-linking agent and catalyst are added into the vessel and are stirred for 2 to 3 hours under room temperature to obtain a mixed liquor after reaction; (3) the mixed liquor is performed with filtering, deaeration and stewing consecutively and then membrane-scraping treatment is conducted to obtain a membrane cog; (4) the membrane cog is vulcanized under room temperature and after the solvent volatizes, the membrane cog is put into a dry box for further high temperature vulcanization to obtain the infiltration vaporizable membrane. The preparation method of the infiltration vaporizable membrane used for the alcohol-water separation system has the advantages of high separation performance and excellent stability.

Description

technical field [0001] The invention relates to a method for preparing a pervaporation membrane for separating an alcohol-water system, in particular to a method for preparing a pervaporation membrane for concentrating ethanol produced by cellulose fermentation. Background technique [0002] At present, there have been many reports on the separation of pervaporation with preferential water permeability in alcohol-water system at home and abroad, and the use of pervaporation to prepare anhydrous ethanol has entered industrial application. However, the pervaporation process with preferential water permeability is only suitable for processing systems rich in alcohols and low in water content, such as the dehydration of ethanol with a concentration of 99% (w) to produce absolute ethanol. In industrial production, there are many aqueous solutions with low alcohol content, such as in the bio-fermentation ethanol process, the ethanol concentration in the fermentation liquid is abou...

Claims

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Application Information

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IPC IPC(8): B01D71/70
Inventor 黄和白云翔张红漫张林陈欢林
Owner CHINA PETROLEUM & CHEM CORP
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