Bacteria cellulose pervaporation membrane and uses thereof

A technology of pervaporation membrane and bacterial cellulose, which is applied in the field of bacterial cellulose pervaporation membrane and separation of organic matter aqueous solution, can solve the problems of complex process and difficult control of membrane uniformity, achieve high separation selectivity, solve chemical stability, Cost-effective preparation

Inactive Publication Date: 2008-08-06
许春元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The German GFT company has realized the industrial application of the cross-linked PVA composite membrane separation ethanol water system in 1983 (GermanPat: DE3220570A1, 1983-12-01), but its industrial application is limited due to its excessively compact structure. Widely used, and the traditional film-making method is complicated, and the uniformity of the film is difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1. A bacterial cellulose pervaporation membrane, the preparation method of which is as follows: take the activated Acetobacter xylinum DT4.2 strain and insert it into a seed culture solution, and after 8 hours of shaking culture on a constant temperature shaker at 25°C, insert the seed solution into a fermentation culture In the liquid, shake well, transfer the fermentation liquid to a container, cultivate at a constant temperature of 25°C for 7 days, form a film on the surface of the fermentation liquid, take out the film and treat it with lye with a mass concentration of 1%, and rinse the film with deionized water. The remaining lye in the medium becomes neutral, and it is dried to form a film.

Embodiment 2

[0019] Example 2. A bacterial cellulose pervaporation membrane, the preparation method of which is as follows: take the activated Acetobacter xylinum DT4.2 strain and insert it into a seed culture solution, and after 32° C. constant temperature shaker shaking culture for 24 hours, insert the seed solution into the fermentation culture In the liquid, shake well, transfer the fermentation liquid to a container, cultivate at a constant temperature of 32 °C for 15 days, form a film on the surface of the fermentation liquid, take out the film and treat it with lye solution with a mass concentration of 20%, rinse the film with deionized water The remaining lye in the medium becomes neutral, and it is dried to form a film.

Embodiment 3

[0020] Example 3. A bacterial cellulose pervaporation membrane, the preparation method of which is as follows: take the activated Acetobacter xylinum DT4.2 strain and insert it into a seed culture solution, and after 28° C. constant temperature shaker shaking culture for 10 hours, insert the seed solution into the fermentation culture In the liquid, shake well, transfer the fermentation liquid to a container, cultivate at a constant temperature of 28°C for 9 days, form a film on the surface of the fermentation liquid, take out the film and treat it with lye with a mass concentration of 3%, and rinse the film with deionized water. The remaining lye in the medium becomes neutral, and it is dried to form a film.

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Abstract

The invention provides a bacterial cellulose pervaporation membrane, which is characterized in that the preparation method is as follows: Acetobacter xylinum DT4.2 strain of the active wood fermentation is put into the seed culture fluid and shaking cultured at constant temperature of 25 to 32 DEG C for 8 to 24 hours; the seed solution is put into the fermentation culture solution to be evenly shaken; and then the fermentation culture solution is moved to the container for culturing for 7 to 15 days at the constant temperature of 25 to 32 DEG C; pellicle membrane formed on the surface of the fermentation solution is taken out and then is processed by the alkali liquor with the quality concentration of 1 to 20 percent; the residual alkali liquor in the membrane is washed to neutrality by the deionized water to prepare into the membrane after drying. The invention also discloses the application of the membrane. The preparation method of the membrane has the advantages of simple preparation, good mechanical and chemical property, excellent heat stability, strong hydrophilicity, high separation choice to the water in the organic water solution at lower temperature, long service life; moreover, the membrane material itself can be biodegradation which is a environmental friendly material.

Description

technical field [0001] The present invention relates to a membrane for pervaporation, in particular to a bacterial cellulose pervaporation membrane; the present invention also relates to the use of the above bacterial cellulose membrane for separating aqueous organic matter. Background technique [0002] Pervaporation refers to a membrane separation method in which the liquid mixture is partially evaporated under the action of the vapor partial pressure difference of the components on both sides of the membrane when the object to be separated passes through the membrane, thereby achieving the purpose of separation. Because pervaporation technology has the characteristics of good single-stage selectivity, simple operation, low energy consumption, and no pollution, it is especially suitable for the separation of azeotropic and near-boiling systems of organic matter aqueous solutions, which has attracted widespread attention in the past two or three decades. . The core of perv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D61/36
Inventor 许春元孙东平
Owner 许春元
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