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Preparation method of blended and cross-linked polyvinyl alcohol (PVA) pervaporation membrane

A technology of cross-linked polyvinyl alcohol and pervaporation membrane, which is applied in the field of membrane separation, can solve the problems of restricting the application of PVA membranes, poor membrane permeability, and low operating efficiency, and achieves easy industrial production, high mechanical strength, and water solubility. Good results

Active Publication Date: 2015-07-08
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVA composite membranes are widely used in membrane technologies such as ultrafiltration, nanofiltration, reverse osmosis, and pervaporation. Although they have good separation selectivity, the permeability of the membrane is poor, so the operating efficiency is not high, which restricts it to a certain extent. The application of PVA film

Method used

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  • Preparation method of blended and cross-linked polyvinyl alcohol (PVA) pervaporation membrane
  • Preparation method of blended and cross-linked polyvinyl alcohol (PVA) pervaporation membrane
  • Preparation method of blended and cross-linked polyvinyl alcohol (PVA) pervaporation membrane

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preparation example Construction

[0024] (2) Preparation of pervaporation membrane: Dissolve polyvinyl alcohol with a degree of polymerization of 1750±50 in water at 80~100°C, prepare a PVA solution with a mass concentration of 1%~10%, and add it to step (1) to prepare Water-soluble hyperbranched polymer with a mass concentration of 1% to 50%, stir and mix evenly, cool to room temperature, filter to remove impurities, add a crosslinking agent with a mass ratio of 0.5% to 10%, and adjust the mixed solution to PH=2, The coating solution can be obtained after static defoaming; wherein the chemical crosslinking agent is selected from glutaraldehyde, formaldehyde, terephthalaldehyde, maleic acid, adipic acid, succinic anhydride, pyromellitic anhydride Any one of them, the pH adjustment can be either sulfuric acid or hydrochloric acid;

[0025] (3) Scrape-coat the polyvinyl alcohol coating solution prepared in step (2) on the porous polymer base film with an average pore size of 50-100 μm, and put it in a vacuum at ...

Embodiment

[0036] The water-soluble hyperbranched polymer is synthesized by the inventor, taking the synthesis of the fourth generation water-soluble hyperbranched polymer as an example, the specific steps are as follows:

[0037] (1) Add DMPA (120mmol, 16.34g), pentaerythritol (10mmol, 1.36g) and catalyst p-TSA (0.08g) into a three-neck flask with stirring blade, nitrogen inlet and drying tube. Under mechanical stirring and nitrogen flow, the temperature was raised to 140 ~ 170 o c. After reacting at normal pressure for 2 hours, turn off the nitrogen gas, seal the three-neck flask and depressurize to 1.2kPa, stop the depressurization after 2 hours of reaction, and obtain the second generation hyperbranched polyester (HBPE-2); then weigh 21.8g of DMPA and p-TSA 0.12 g, put it into the three-necked flask, continue to pass nitrogen and raise the temperature to 140 ~ 170 ° C, turn off the nitrogen after 2 hours of normal pressure reaction, reduce the pressure to 1.2kPa and continue the rea...

Embodiment 1

[0043] Dissolve 5g of PVA in 95g of water, the dissolution temperature is 90 ~ 95°C, add 0.25g of WHBP and stir for 4 hours until it is completely dissolved. After the mixed solution is cooled, let it stand for defoaming, add 0.25g of crosslinking agent (5% of the mass of PVA), Add sulfuric acid dropwise to adjust the mixed solution to PH = 2, stir slowly until the mixture is uniform to form a casting solution, and evenly scrape the casting solution on the PAN (polyacrylonitrile) ultrafiltration membrane. After the solvent evaporates naturally, put it in a vacuum drying oven Heat cross-linking at 100°C for 1h. The novel blended cross-linked pervaporation membrane is obtained.

[0044] The above-mentioned pervaporation membrane is used to separate n-butanol-water system, and the permeation flux is 233g / m 2 h, Separation factor 711.

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Abstract

A preparation method of a blended and cross-linked polyvinyl alcohol (PVA) pervaporation membrane belongs to the technical field of membrane separation. The preparation method aims to obtain a high-throughput and high-selectivity blended and cross-linked pervaporation PVA membrane by blending and cross-linking a water-soluble hyperbranched polymer (WHBP). The preparation method comprises the following steps: synthesizing the WHBP; preparing a pervaporation membrane; and blade-coating a high molecular porous base membrane, of which the average pore size is 50-100mu m, with a PVA coating solution prepared in the last step, after a solvent naturally volatilizes for 12-48h, placing the high molecular porous base membrane in a vacuum drying oven at 80-100DEG C for heat treatment for 1-3h, thereby obtaining the blended and cross-linked PVA pervaporation membrane. The WHBP / PVA membrane prepared according to the preparation method has high separation performance and high throughput when used for pervaporation separation of n-butyl alcohol and water, and is widely applicable to dehydration of organic solvents, especially dehydration of alcohol.

Description

technical field [0001] The invention belongs to the technical field of membrane separation. Background technique [0002] Pervaporation (PV) is a new liquid mixture membrane separation technology that has been developed rapidly in the past 30 years. It can be used for the separation of azeotropes and near-boiling systems that are difficult to handle by traditional separation methods, the removal of trace water, and Removal of trace organic matter in water. Pervaporation membrane separation technology has the characteristics of high efficiency, energy saving, and simple process. It may replace traditional separation methods such as complex and energy-intensive rectification, crystallization, and adsorption. It will become one of the key points of new separation technologies in the fields of chemical industry and environmental protection in the future. [0003] Polyvinyl alcohol (PVA) is a water-soluble polymer with a wide range of uses. It has good film-forming properties, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D69/02B01D67/00
Inventor 孙德杨萍李静邵晓凤张金艳李鹏仙
Owner CHANGCHUN UNIV OF TECH
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