Bacteria cellulose pervaporation membrane and application thereof

Abstract

The invention relates to a bacteria cellulose pervaporation membrane, which is characterized in that a method for preparing the bacteria cellulose pervaporation membrane comprises the following steps of: taking an activated Acetobacter xylinum strain, and inoculating the strain into a seed culture medium; performing shaking table shaking culture for 8 to 24 hours at a constant temperature of between 25 and 32 DEG C, and then inoculating a seed solution into a fermentation culture medium; agitating the mixture uniformly, transferring a fermentation broth into a container, and culturing the fermentation broth for 7 to 15 days at a constant temperature of between 25 and 32 DEG C so as to form a surface membrane on the surface of the fermentation broth; taking the membrane out of the container, treating the membrane by using 1 to 15 mass percent of alkali liquor; rinsing the residual alkali liquor in the membrane by using deionized water until the membrane is neutral; and drying the membrane to obtain the pervaporation membrane. The pervaporation membrane has a simple preparation method, good mechanical properties, chemical properties and thermal stability and strong hydrophilicity, and has high separation selectivity to the water in an organic matter aqueous solution at a low temperature; besides, the pervaporation membrane has a long service life, and a membrane material is biodegradable and is an environment-friendly material.

Description

Technical field [0001] The present invention relates to a membrane for pervaporation, in particular a bacterial cellulose pervaporation membrane; the invention also relates to the use of the bacterial cellulose membrane for separating organic matter aqueous solutions. Background technique [0002] Pervaporation refers to a membrane separation method in which the liquid mixture partially evaporates under the effect of the vapor partial pressure difference of the components on both sides of the membrane when the separated substance passes through the membrane, so as to achieve the purpose of separation. Because the 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 aqueous solutions, which has attracted widespread attention in the past two to three decades. . The core of pervaporation technology i...

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