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Preparation method of cellulose ether-ethyl orthosilicate pervaporation hybrid membrane

A technology of tetraethyl orthosilicate and pervaporation, applied in chemical instruments and methods, semipermeable membrane separation, membrane technology, etc., can solve the problems of low separation factor, high cost, complicated membrane preparation process, etc., and achieve good separation Good effect, easy operation, controllability and production repeatability

Inactive Publication Date: 2013-04-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to overcome the shortcomings of existing methanol aqueous pervaporation membranes, such as low separation factor, complicated membrane preparation process and high cost.

Method used

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  • Preparation method of cellulose ether-ethyl orthosilicate pervaporation hybrid membrane
  • Preparation method of cellulose ether-ethyl orthosilicate pervaporation hybrid membrane

Examples

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Effect test

Embodiment 1

[0026] Example 1: Weigh 4g of hydroxyethyl cellulose and dissolve it in 100g of distilled water, stir at 70°C until it dissolves completely, weigh 0.2g (5wt%, relative to HEC) TEOS, dissolve it in water to make it hydrolyzed, water and The molar ratio of TEOS is 5:1. Use hydrochloric acid to adjust the pH of the solution to between 1-3. After the solution reacts until it becomes clear, slowly add it into the hydroxyethyl cellulose 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 hours, then vacuum-dry at 60-70°C for 24 hours, soak the obtained film in the cross-linking solution for cross-linking, cross-linking The solution is 180mL of acetone-water solution (1:2, v / v), 2.5mL of hydrochloric acid, an...

Embodiment 2

[0027] 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 organic-inorganic hybrid membrane of the present invention is prepared. When the feed liquid concentration (methanol wt%) is 90% and 95% respectively, the permeation flux J (g / m 2 h) are 270 and 235 respectively, and the separation factor α is 352 and 812 respectively.

Embodiment 3

[0028] 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 organic-inorganic hybrid membrane of the present invention is prepared. When the feed liquid concentration (methanol wt%) is 90% and 95% respectively, the permeation flux J (g / m 2 h) are 193 and 157 respectively, and the separation factor α is 699 and 1319 respectively.

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Abstract

The invention discloses a pervaporation hybrid membrane for separating a methanol water solution and a preparation method thereof. The hybrid membrane is prepared from raw materials cellulose ether and ethyl orthosilicate. The preparation method comprises the following steps: blending and hybridizing the cellulose ether and ethyl orthosilicate to obtain a membrane casting solution; forming the membrane by a solution casting method; lightly crosslinking the membrane with a chemical crosslinking agent; and preparing the cellulose ether pervaporation hybrid membrane for separating the methanol water solution. The organic-inorganic hybrid membrane prepared by the method is a high-hydrophilicity pervaporation membrane, is suitable for dehydrating organic solvents, especially has favorable separation effect on the methanol water solution which can not be effectively separated by other membranes, and also has favorable separation effect on water solutions of ethanol, isopropanol and the like.

Description

technical field [0001] The invention belongs to the technical field of pervaporation membranes, and in particular relates to a cellulose ether-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 sensitivity....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/22B01D67/00B01D61/36
Inventor 董锐钱晓荣孙晓斌张建勋
Owner YANCHENG INST OF TECH
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