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A kind of pervaporation membrane for separating N,N-dimethylformamide aqueous solution and preparation method thereof

A technology of dimethylformamide and pervaporation membranes, applied in chemical instruments and methods, semipermeable membrane separation, membranes, etc., can solve the problems of poor swelling resistance, low permeation flux, and low separation coefficient of polyvinyl alcohol membranes , to achieve the effect of increasing permeation flux and separation coefficient, increasing adsorption content, and increasing adsorption specific surface area

Active Publication Date: 2022-05-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: the present invention aims at separating the specific substance system (DMF / H 2 O) the problems of low permeation flux, low separation coefficient and poor swelling resistance of polyvinyl alcohol membranes during the existence of O) provide a kind of polyvinyl alcohol pervaporation membrane utilizing modified silicon dioxide modification, and this membrane has high permeation flux Quantity and Separation Factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention is used for separating the preparation method of the pervaporation membrane of N,N-dimethylformamide aqueous solution, specifically:

[0020] According to the mass ratio of 9:1:10, mix polyvinyl alcohol (polyvinyl alcohol molecular weight is 1500-5000, alcoholysis degree is 50%-88%), polyacrylic acid (solid powder, polyacrylic acid molecular weight is 2000-45000) and water , weighed 50g of the mixture, stirred at 80°C for 2h, and after the polyvinyl alcohol was fully dissolved, cooled to room temperature to obtain an aqueous solution of polyvinyl alcohol; weighed 4g of silicon dioxide and added it to 40mL of nitric acid (69wt.%), Reflux for 30 minutes, then filter the reactant, wash with water until neutral, and dry under vacuum at 60°C to obtain dry sample A; take 3g of dry sample A and 1g of aminopropyltrimethoxysilane and add it to 6mL of toluene. Sonicate for 10 minutes, then heat and stir at 50°C and 500rpm for 30min, and then vacuum-dry at 60...

Embodiment 2

[0022] The present invention is used for separating the preparation method of the pervaporation membrane of N,N-dimethylformamide aqueous solution, specifically:

[0023] Mix polyvinyl alcohol, polyacrylic acid and water according to a mass ratio of 9:1:10, weigh 50 g of the mixture, stir at 80°C for 4 hours, and after the polyvinyl alcohol is fully dissolved, cool down to room temperature to obtain an aqueous solution of polyvinyl alcohol; Add 4g of silicon dioxide to 60mL of nitric acid (69wt.%), reflux at 65°C for 60min, then filter the reactant, wash with water until neutral, and dry in vacuum at 70°C to obtain dry sample A; take 3g of dry sample A, Add 1g of aminopropyltrimethoxysilane to 6mL of toluene, sonicate at 80MHz for 20min, then heat and stir at 65°C and 500rpm for 60min, and dry in vacuum at 70°C after reaction to obtain dry sample B; weigh 1g of dry Sample B, 3g of maleic anhydride and 15mL of methanol were mixed, heated and stirred at 40°C and 2000rpm for 20h,...

Embodiment 3

[0025] The present invention is used for separating the preparation method of the pervaporation membrane of N,N-dimethylformamide aqueous solution, specifically:

[0026]Mix polyvinyl alcohol, polyacrylic acid and water according to a mass ratio of 9:1:10, weigh 50 g of the mixture, stir at 90°C for 6 hours, and after the polyvinyl alcohol is fully dissolved, cool down to room temperature to obtain an aqueous solution of polyvinyl alcohol; Add 4g of silicon dioxide to 80mL of nitric acid (69wt.%), reflux at 80°C for 90min, then filter the reactant, wash with water until neutral, and dry in vacuum at 80°C to obtain dry sample A; take 3g of dry sample A, Add 1g of aminopropyltrimethoxysilane to 6mL of toluene, sonicate at 80MHz for 30min, then heat and stir at 80°C and 500rpm for 90min, and dry in vacuum at 80°C after reaction to obtain dry sample B; weigh 1g of dry Sample B, 6g chitosan and 20mL methanol were mixed, heated and stirred at 50°C and 2000rpm for 25h, filtered, wash...

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Abstract

The invention discloses a pervaporation membrane for separating N,N-dimethylformamide aqueous solution, and the pervaporation membrane is a composite membrane formed of polyvinyl alcohol and polyacrylic acid doped with modified silicon dioxide . The present invention also discloses the preparation method of the above-mentioned pervaporation membrane for separating N,N-dimethylformamide aqueous solution, specifically: mixing polyvinyl alcohol, polyacrylic acid and water, and obtaining polyvinyl alcohol aqueous solution after heating; The polyvinyl alcohol aqueous solution is added to the modified silica, and after stirring and mixing, the cast film solution is obtained, and the film is cast into a film; the obtained film is placed in the cross-linking solution for cross-linking treatment, and then dried to obtain the required pervaporation membrane. The present invention can effectively increase the number of hydrophilic groups inside the composite membrane by doping the modified silicon dioxide in the polyvinyl alcohol and polyacrylic acid composite membrane, thereby increasing the hydrophilicity of the composite membrane, and further improving the membrane's ability to separate DMF aqueous solution. The permeation flux and separation coefficient at that time can improve the separation performance of the membrane.

Description

technical field [0001] The present invention relates to a pervaporation membrane for separating N,N-dimethylformamide aqueous solution, and also relates to a preparation method of the above-mentioned pervaporation membrane for separating N,N-dimethylformamide aqueous solution. Background technique [0002] As an excellent solvent, N, N-dimethylformamide (DMF) is widely used in various fields such as chemical production, medicine and leather industry. However, after DMF is used, waste liquid with a mass concentration of 5% to 25% will be formed. Common separation methods for DMF in waste liquid include adsorption, supercritical water oxidation, extractive distillation, etc., but these methods have high costs and high energy efficiency. Due to problems such as high consumption, complex operation and poor safety, it is necessary to choose a more cost-effective separation method. Pervaporation is a new type of separation technology, which is based on the mechanism of dissolutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/36B01D69/12B01D71/38
CPCB01D61/362B01D69/12B01D71/38B01D69/125B01D2325/36B01D2325/24
Inventor 肖国民张宗琦阮芳玲
Owner SOUTHEAST UNIV
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