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Preparation method for cellulose ether-sodium alginate-tetraethylortho silicate pervaporation and hybrid membrane

A technology of tetraethyl orthosilicate and pervaporation, applied in chemical instruments and methods, semipermeable membrane separation, membrane technology, etc., can solve the problem of low pervaporation membrane separation factor, insufficient permeation flux, and complicated membrane preparation process and other problems, to achieve the effects of good controllability and production repeatability, uniform appearance, excellent solvent resistance and stability

Inactive Publication Date: 2013-04-24
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the invention is to overcome the shortcomings of the existing methanol aqueous pervaporation membrane, such as low separation factor, or insufficient permeation flux, or complicated membrane preparation process and high cost.

Method used

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  • Preparation method for cellulose ether-sodium alginate-tetraethylortho silicate pervaporation and hybrid membrane
  • Preparation method for cellulose ether-sodium alginate-tetraethylortho silicate pervaporation and hybrid membrane
  • Preparation method for cellulose ether-sodium alginate-tetraethylortho silicate pervaporation and hybrid membrane

Examples

Experimental program
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Embodiment 1

[0029] Example 1: Weigh 4g of hydroxyethyl cellulose and dissolve it in 100g of distilled water, stir at 70°C until it is completely dissolved, weigh 2g of sodium alginate and add it to the hydroxyethyl cellulose solution, and continue stirring for 12 hours until a homogeneous solution is formed. phase transparent solution. Then weigh 0.2g (5wt%, relative to HEC) TEOS, dissolve it in water to make it hydrolyzed, the molar ratio of water to TEOS is 5:1, adjust the pH of the solution to 1-3 with hydrochloric acid, wait for the TEOS aqueous solution to react to After clarification, slowly add into the hydroxyethyl cellulose-sodium alginate aqueous solution, and keep stirring to form a homogeneous transparent sol. Filter the obtained sol through a 2# sand core funnel to remove insoluble matter, let it stand still, and defoam to obtain a casting solution. Coat the sol on the surface of the polyacrylonitrile base film with a doctor blade, gel and dry at room temperature for 48 hou...

Embodiment 2

[0030] Embodiment 2: The process steps as in Example 1, wherein only the amount of TEOS added is changed to 0.4g (10wt%, relative to HEC), and the hydroxyethyl cellulose-sodium alginate organic-inorganic hybrid of the present invention is made membrane. When the feed concentration (methanol wt%) is 90% and 95% respectively, the permeation flux J (g / m 2 h) are 395 and 325 respectively, and the separation factor α is 331 and 788 respectively.

Embodiment 3

[0031] Embodiment 3: The process steps as in Example 1, wherein only the amount of TEOS added is changed to 0.6g (15wt%, relative to HEC), and the hydroxyethyl cellulose-sodium alginate organic-inorganic hybrid membrane. When the feed concentration (methanol wt%) is 90% and 95% respectively, the permeation flux J (g / m 2 h) are 347 and 253 respectively, and the separation factor α is 638 and 1207 respectively.

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Abstract

The invention discloses a pervaporation and hybrid membrane for separating methanol aqueous solution and a preparation method of the pervaporation and hybrid membrane. Raw materials for preparing the hybrid membrane comprise cellulose ether, sodium alginate and tetraethylortho silicate. The preparation method of the hybrid membrane comprises the following steps of: blending and hybridizing the cellulose ether, the sodium alginate and the tetraethylortho silicate to obtain a membrane casing liquid; forming a membrane by using a solution casting method; carrying out light cross-linking by using a chemical cross-linking agent for the membrane; and preparing a cellulose ether pervaporation and hybrid membrane for separating the methanol aqueous solution. An organic-inorganic hybrid membrane prepared by the preparation method disclosed by the invention is a highly-hydrophilic pervaporation membrane and is suitable for dehydrating organic solvent; in particular to the methanol aqueous solution which is difficultly to be effectively separated by other membranes, the organic-inorganic hybrid membrane has higher separation factor and higher permeate flux. In addition, the permeate flux also has better separating effect on methanol aqueous solution of ethanol, isopropanol and the like.

Description

technical field [0001] The invention belongs to the technical field of pervaporation membranes, in particular to a cellulose ether-sodium alginate-orthosilicate pervaporation hybrid membrane for separating methanol aqueous solution and a preparation method thereof. Background technique [0002] Pervaporation (PV) is a membrane separation process for the separation of liquid mixtures. It uses the osmotic pressure difference between the components as the driving force, and relies on the difference in the dissolution and diffusion rates of the components in the membrane to achieve the separation purpose. Compared with traditional distillation, adsorption, extraction and other separation processes, it has the advantages of high separation efficiency, simple equipment, easy operation, no pollution in the process, and low energy consumption. PV shows its unique advantages in the separation of near-boiling point mixtures, azeotropes and mixed systems with high temperature sensitiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/22B01D71/42B01D71/06B01D61/36
Inventor 董锐钱晓荣孙晓斌周冰倩
Owner YANCHENG INST OF TECH
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