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Pervaporation Composite Membrane with "Stepped" Crosslinking Degree and Preparation Method

A technology of pervaporation and cross-linking, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as increased permeation flux, separation layer thickness, and increased diffusion resistance, so as to improve separation performance , simple operation, easy to promote the effect

Active Publication Date: 2021-03-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite membrane prepared by the phase inversion method often has a thick separation layer, which limits the further improvement of its permeation flux, and according to the principle of solubility parameter, the closer the solubility parameter of the membrane material is to a certain component in the system to be separated, the better the Components are preferentially dissolved on the membrane surface
However, the solubility of the two is very good, which will cause the separated components to stay in the polymer and no longer diffuse, increasing the resistance of diffusion and affecting the increase of permeation flux.

Method used

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  • Pervaporation Composite Membrane with "Stepped" Crosslinking Degree and Preparation Method
  • Pervaporation Composite Membrane with "Stepped" Crosslinking Degree and Preparation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Rinse the polyacrylonitrile base film after hydrolysis to neutrality with deionized water, and remove the moisture on the film surface by rotating centrifugal force;

[0025] (2) The aqueous solution of polyethyleneimine with a mass fraction of 0.5wt% is evenly coated on the surface of the material obtained in step (1), placed for 2 minutes, poured off the excess solution, and removed the excess solution on the membrane surface by rotating centrifugal force , so that there are no droplets on the membrane surface;

[0026] (3) The n-hexane solution of 2,4-toluene diisocyanate with a mass fraction of 0.1wt% is evenly coated on the surface of the material obtained in step (2), placed for 120s, poured off the excess solution, and used Rotating centrifugal force removes excess solution on the membrane surface;

[0027] (4) Change the mass fraction of 2,4-diisocyanate toluene to 0.05wt% and 0.025wt% respectively, and repeat step (2) and step (3) twice on the material obt...

Embodiment 2

[0032] (1) Rinse the polyacrylonitrile base film after hydrolysis to neutrality with deionized water, and remove the moisture on the film surface by rotating centrifugal force;

[0033] (2) The aqueous solution of diethylenetriamine that the mass fraction is 1.5wt% is evenly coated on the surface of the material that step (1) obtains, stand 3min, pour off excess solution, remove excess solution on membrane surface with rotating centrifugal force , so that there are no droplets on the membrane surface;

[0034] (3) The n-hexane solution of 2,4-diisocyanate toluene with a mass fraction of 1wt% is evenly coated on the surface of the material obtained in step (2), placed for 180s, poured off the excess solution, and Centrifugal force removes excess solution on the membrane surface;

[0035] (4) Change the mass fraction of 2,4-diisocyanate toluene to 0.5wt% and 0 respectively, and repeat step (2) and step (3) twice on the material obtained in step (3);

[0036] (5) The material o...

Embodiment 3

[0040] (1) Rinse the commercial polyethersulfone bottom membrane with deionized water, and remove the moisture on the surface of the membrane by rotating centrifugal force;

[0041](2) The aqueous solution of diethylenetriamine that the mass fraction is 1.5wt% is evenly coated on the surface of the material that step (1) obtains, stand 5min, pour off excess solution, remove excess solution on membrane surface with rotating centrifugal force , so that there are no droplets on the membrane surface;

[0042] (3) The n-hexane solution of 2,4-diisocyanate toluene with a mass fraction of 1wt% is evenly coated on the surface of the material obtained in step (2), placed for 180s, poured off the excess solution, and Centrifugal force removes excess solution on the membrane surface;

[0043] (4) Change the mass fraction of 2,4-toluene diisocyanate to be 0.6wt%, 0.3wt% and 0 respectively, and repeat step (2) and step (3) 3 times on the material obtained in step (3) ;

[0044] (5) The ...

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Abstract

The invention provides a pervaporation composite membrane with step crosslinking degree and a preparation method thereof. A novel pervaporation composite membrane is prepared by using an interfacial polymerization method. By changing the concentration of an oil phase monomer (a crosslinking agent), a composite membrane with a step crosslinking degree is obtained, so that the separating performanceof the membrane is obviously improved. The preparation method of the pervaporation composite membrane with the step crosslinking degree, provided by the invention, is simple to operate and easy to popularize; and the composite membrane with step crosslinking degree and the preparation method thereof can be used for the fields of a pervaporation dehydration membrane, a pervaporation alcohol permeating membrane, a pervaporation organic matter separating membrane, a gas separating membrane, a reverse osmosis membrane and other membranes; and a new thought and a new method are opened for membraneseparation researches.

Description

technical field [0001] The invention relates to a pervaporation membrane with "ladder" crosslinking degree and a preparation method thereof, which are suitable for the production of absolute ethanol in chemical process. Background technique [0002] At present, there are many production methods of industrial anhydrous ethanol, such as molecular sieve adsorption, ternary azeotropic distillation, extractive distillation and so on. These methods can all achieve the production of absolute ethanol with a conventional water yield of less than 1%, but when the water content of absolute ethanol is further reduced, either the requirements cannot be met, or there are high energy consumption, high cost, and serious pollution in the operation process , low yield and other problems, which seriously restrict the development of related products in industries such as pharmaceuticals and fine chemicals. [0003] Pervaporation membrane separation technology has been used in many chemical pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00
CPCB01D67/0006B01D69/12B01D69/125
Inventor 孙海翔罗旭兵李国庆牛青山李鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)