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A cyclodextrin-modified polyamide film composite membrane, its preparation and application

A cyclodextrin and composite membrane technology, applied in the field of membrane separation, can solve problems such as poor separation effect of polyamide composite membrane, achieve good pervaporation alcohol-water separation performance, improve hydrophilicity, and improve the effect of separation factor

Active Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solves the technical problem of the poor separation effect of the prior art polyamide composite membrane in the application of the alcohol / water separation system

Method used

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  • A cyclodextrin-modified polyamide film composite membrane, its preparation and application
  • A cyclodextrin-modified polyamide film composite membrane, its preparation and application
  • A cyclodextrin-modified polyamide film composite membrane, its preparation and application

Examples

Experimental program
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Effect test

preparation example Construction

[0030] A kind of preparation method of the polyamide composite film of cyclodextrin modification provided by the invention, comprises the steps:

[0031] (1) Soak the polymer base film in the polyamine aqueous solution, take it out after fully soaking, and obtain the treated polymer base film;

[0032] (2) contacting the polymer base film treated in step (1) with the polyacyl chloride solution, so that the interfacial polymerization reaction of the polyamine and the polyacyl chloride occurs to obtain a polyamide composite film;

[0033] (3) Transfer the composite membrane obtained in step (2) to soak in an aqueous solution of cyclodextrin, so that the residual polyacyl chloride on the surface of the composite membrane and the cyclodextrin in the aqueous solution of cyclodextrin undergo a secondary interfacial polymerization reaction, which The esterification reaction between the polyacyl chloride and the hydroxyl group in the cyclodextrin molecule generates polyester; or the c...

Embodiment 1

[0076] The polymer base membrane of the polyamide composite membrane prepared in this embodiment is a polyacrylonitrile hollow fiber ultrafiltration membrane. The preparation process of this composite film comprises the following steps:

[0077] (1) Basement membrane hydrolysis: same as Comparative Example 1.

[0078] (2) Soak the water phase: same as Comparative Example 1.

[0079] (3) Immersion oil phase: same as Comparative Example 1.

[0080] (4) Secondary interfacial polymerization: the composite membrane obtained in step (3) was transferred to an aqueous solution of β-cyclodextrin (pH 12, mass fraction 2%), soaked for 20 min, and then rinsed with water. Among them, β-cyclodextrin is abbreviated as β-CD, which is a raw material purchased from the market; its schematic structural formula is:

[0081]

Embodiment 2

[0083] The polymer base membrane of the polyamide composite membrane prepared in this embodiment is a polyacrylonitrile hollow fiber ultrafiltration membrane. The preparation process of this composite film comprises the following steps:

[0084](1) Synthesis of aminated cyclodextrin: first prepare an aqueous solution of KOH / cyclodextrin (molar ratio 120 / 7), heat it to 50° C., and then add excess ammonia water. Next, the temperature of the solution was raised to 60°C. Slowly add epichlorohydrin in an equimolar amount to ammonia water dropwise into the above solution. After the reaction was carried out for 1 hour, the solution was left to cool, and then the pH was adjusted to neutral with concentrated sulfuric acid. The mixture was concentrated by a rotary evaporator, and then washed sequentially with sufficient ethanol and methanol to remove inorganic salts and by-products. The final product was dried overnight in a vacuum oven at 55 °C and named β-CD-NH 4 Oh.

[0085] (2)...

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Abstract

The invention belongs to the field of membrane separation, and more specifically relates to a cyclodextrin-modified polyamide film composite membrane, its preparation and application. The preparation method of the composite film comprises the following steps: soaking the polymer base film in the polyamine aqueous solution, taking it out after soaking to obtain the treated polymer base film; contacting the treated polymer base film with the polybasic acid chloride solution, so that Interfacial polymerization of polyamines and polyacyl chlorides to obtain a polyamide composite film; transfer the composite film to an aqueous solution of cyclodextrin or an aqueous solution of aminated cyclodextrin for soaking, so that the residual polyacyl chloride solution and cyclodextrin on the surface of the composite film The fine aqueous solution or the aminated cyclodextrin aqueous solution undergoes a secondary interfacial polymerization reaction, and a cyclodextrin-modified polyamide composite membrane is obtained after washing. The process of the invention is simple, and the prepared membrane has good hydrophilicity, and when it is applied to the separation of alcohol / water, it shows high-efficiency separation performance.

Description

technical field [0001] The invention belongs to the field of membrane separation, and more specifically relates to a cyclodextrin-modified polyamide film composite membrane, its preparation and application. Background technique [0002] Membrane technology is a new chemical separation technology that has flourished in recent decades and is widely used in water, energy, food, chemical and medical fields. As one of the most significant methods, pervaporation has attracted extensive attention from industry and academia because of its low energy consumption, environmental friendliness, simple operation, and excellent separation performance. Compared with the traditional separation process, pervaporation can break the limitation of vapor-liquid equilibrium, has great advantages in the separation of liquid mixtures, and can solve the problem of dehydration of alcohols. Therefore, the preparation of pervaporation membranes for the efficient separation of alcohol-water mixtures has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/02B01D67/00B01D61/36C07C29/76C07C31/08
CPCB01D61/362B01D67/0006B01D67/0093B01D69/02B01D69/12B01D71/56B01D2325/36C07C29/76C07C31/08
Inventor 王艳虞希
Owner HUAZHONG UNIV OF SCI & TECH
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