Preparation method for polyvinyl alcohol double-function asymmetric catalysis-pervaporation membrane

A technology of pervaporation membrane and polyvinyl alcohol, which is applied in the field of membrane separation, can solve the problems of low conversion rate of raw materials and product yield, long reaction time, increased equipment investment, etc., and achieves high catalytic efficiency, full utilization, and good application value. Effect

Inactive Publication Date: 2018-11-13
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional esterification reaction will be limited by the thermodynamic equilibrium, the reaction time is long, the conversion rate of raw materials and the yield of products are low, and the separation of later products will increase the investment in equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The invention provides a polyvinyl alcohol bifunctional asymmetric catalytic-pervaporation membrane preparation method, the preparation method is as follows,

[0019] Dissolve 8g of PVA in 92g of water, keep the temperature above 90°C, add 0.8g of polyethylene glycol, stir for 6 hours until completely dissolved, and let the mixed solution stand for defoaming after cooling. Pour the prepared casting solution onto a clean and flat glass plate and scrape it into a film. After evaporating at room temperature for 60 seconds, put the glass plate in isopropanol to gel for 72 hours, take it out and dry it in a vacuum oven at 55°C . The film is placed in 4wt.% glutaraldehyde acetone solution, the catalyzer of the cross-linking reaction is 1wt.% hydrochloric acid (HCl) at room temperature for 30min, after taking out the cross-linked PVA asymmetric film, continue at 55 The vacuum drying is carried out at a temperature of ℃ to obtain an asymmetric PVA film with a stable structure....

Embodiment 2

[0022] The invention provides a polyvinyl alcohol bifunctional asymmetric catalytic-pervaporation membrane preparation method, the preparation method is as follows,

[0023] Dissolve 10g of PVA in 90g of water, keep the temperature above 90°C, add 1g of polyethylene glycol, stir for 6 hours until completely dissolved, and let the mixed solution stand for defoaming after cooling. Pour the prepared casting solution onto a clean and flat glass plate and scrape it into a film. After evaporating at room temperature for 60 seconds, put the glass plate in isopropanol to gel for 72 hours, take it out and dry it in a vacuum oven at 55°C . The film is placed in 4wt.% glutaraldehyde acetone solution, the catalyzer of the cross-linking reaction is 1wt.% hydrochloric acid (HCl) at room temperature for 30min, after taking out the cross-linked PVA asymmetric film, continue at 55 The vacuum drying is carried out at a temperature of ℃ to obtain an asymmetric PVA film with a stable structure. ...

Embodiment 3

[0026] The invention provides a polyvinyl alcohol bifunctional asymmetric catalytic-pervaporation membrane preparation method, the preparation method is as follows,

[0027] Dissolve 11g of PVA in 89g of water, keep the temperature above 90°C, add 1.1g of polyethylene glycol, stir for 6 hours until completely dissolved, and let the mixed solution stand for defoaming after cooling. Pour the prepared casting solution onto a clean and flat glass plate and scrape it into a film. After evaporating at room temperature for 60 seconds, put the glass plate in isopropanol to gel for 72 hours, take it out and dry it in a vacuum oven at 55°C . The film is placed in 4wt.% glutaraldehyde acetone solution, the catalyzer of the cross-linking reaction is 1wt.% hydrochloric acid (HCl) at room temperature for 30min, after taking out the cross-linked PVA asymmetric film, continue at 55 The vacuum drying is carried out at a temperature of ℃ to obtain an asymmetric PVA film with a stable structure...

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Abstract

The invention provides a method which takes PVA (polyvinyl alcohol) as a membrane material and adds PEG (polyethylene glycol) to form a novel asymmetric structure PVA pervaporation membrane through crosslinking and the catalysis-pervaporation membrane is prepared on the basis of the asymmetric membrane. The preparation method belongs to the technical field of membrane separation and comprises thefollowing steps: dissolving the PVA in water, taking the PEG as additive, taking isopropanol for a gel bath, applying an immersion precipitated phase conversion method to prepare the asymmetric PVA membrane, taking glutaraldehyde as cross-linking agent to carry out membrane cross-linking, and dipping the asymmetric PVA membrane in the alcoholic solution of 5-sulfosalicylic acid to apply a chemicalreaction method to prepare the PVA asymmetric catalysis-pervaporation membrane of which the surface and the hole contains a sulfonic acid group. The novel membrane prepared by the invention has the advantages of high flux, good separation effect, high catalytic property and simple technology and has a relatively good application value in ethyl acetate dehydration and acetic acid and ethyl alcoholesterification reaction.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a polyvinyl alcohol bifunctional asymmetric catalytic-pervaporation membrane. Background technique [0002] The traditional esterification reaction will be limited by thermodynamic equilibrium, the reaction time is long, the conversion rate of raw materials and product yield are low, and the separation of later products will increase the investment in equipment. Therefore, the preparation of a dual-functional catalytic-pervaporation membrane, which can separate products by in-situ pervaporation during the catalytic reaction and break the limitation of thermodynamic equilibrium, is very necessary for simplifying the process, improving the conversion rate of raw materials, and reducing energy consumption and investment costs. of. [0003] Polyvinyl alcohol (PVA) is a superhydrophilic high molecular polymer, which is cheap, has the advantages of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00B01D71/38B01D61/36
CPCB01D61/362B01D67/0093B01D69/02B01D71/38B01D2325/022B01D2325/10
Inventor 孙德曲兆通孙晗硕李冰新
Owner CHANGCHUN UNIV OF TECH
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