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Nano-fiber-based composite pervaporation membrane and preparation method thereof

A technology of nanofibers and pervaporation, applied in chemical instruments and methods, semi-permeable membrane separation, membranes, etc., can solve problems such as unfavorable polymerization of dense skin, damage to composite membrane structure, and difficulty in uniform deposition, achieving efficient and long-lasting organic solvents Effects of dehydration, enhanced stability, and enhanced separation performance

Active Publication Date: 2017-07-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, it is difficult to form a strong interfacial force between the intermediate transition layer of inert carbon nanotubes and nanowires, the porous support layer and the polyamide skin layer, which may lead to the destruction of the composite membrane structure, resulting in a decrease in membrane performance and limiting its application in the field of membrane separation. Applications
In addition, the polydopamine transition layer is difficult to deposit uniformly on the porous support layer, which is not conducive to the controllable preparation of interfacial polymerization dense cortex on its surface.

Method used

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Effect test

Embodiment 1

[0033] A nanofiber-based pervaporation composite membrane is composed of a base layer, an intermediate transition layer and a surface layer. The base layer is a nanofiber porous support layer, the intermediate transition layer is a modified graphene oxide layer, and the surface layer is an interface polymerization active separation layer. The thickness of the surface layer is 40nm.

[0034] The preparation method of the above-mentioned nanofiber-based pervaporation composite membrane is as follows:

[0035] (1) Polypropylene (PAN) (M w =120,000g / mol, Jinshan Petrochemical) 8g was dissolved in 92g of N,N-dimethylformamide (DMF) solvent, and stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution.

[0036] (2) Add the electrospinning solution in step (1) into the syringe, and extrude under the control of a micro-injection pump. The nozzle of the syringe is connected to the high-voltage positive electrode. The electrospinning parameters are controlled...

Embodiment 2

[0043] A nanofiber-based pervaporation composite membrane is composed of a base layer, an intermediate transition layer and a surface layer. The base layer is a nanofiber porous support layer, the intermediate transition layer is a modified graphene oxide layer, and the surface layer is an interface polymerization active separation layer. The thickness of the surface layer is 80nm.

[0044] The preparation method of the above-mentioned nanofiber-based pervaporation composite membrane is as follows:

[0045] (1) polyacrylonitrile (PAN) (M w =120,000g / mol, Jinshan Petrochemical) 8g was dissolved in N,N. dimethylformamide (DMF) solvent 92g, and stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution.

[0046] (2) Add the electrospinning solution in step (1) into the syringe, and extrude under the control of a micro-injection pump. The nozzle of the syringe is connected to the high-voltage positive electrode. The electrospinning parameters are controll...

Embodiment 3

[0053] A nanofiber-based pervaporation composite membrane is composed of a base layer, an intermediate transition layer and a surface layer. The base layer is a nanofiber porous support layer, the intermediate transition layer is a modified graphene oxide layer, and the surface layer is an interface polymerization active separation layer. The thickness of the surface layer is 60nm.

[0054] The preparation method of the above-mentioned nanofiber-based pervaporation composite membrane is as follows:

[0055] (1) polyacrylonitrile (PAN) (M w =120,000g / mol, Jinshan Petrochemical) 8g was dissolved in 92g of N,N-dimethylformamide (DMF) solvent, and stirred at 40°C for 6h to obtain a transparent and uniform electrospinning solution.

[0056] (2) Add the electrospinning solution in step (1) into the syringe, and extrude under the control of a micro-injection pump. The nozzle of the syringe is connected to the high-voltage positive electrode. The electrospinning parameters are contro...

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Abstract

The invention provides a nano-fiber-based composite pervaporation membrane and a preparation method thereof. The nano-fiber-based composite pervaporation membrane is characterized by including a basic layer, a middle transitional layer and a surface layer, wherein the basic layer is a nano-fiber porous support layer, the middle transitional layer is a modified oxidized graphene layer, and the surface layer is a separation layer having interfacial polymerization activity. The simple, modified, thickness-controllable, flexible and ultrathin oxidized graphene skin layer serves as the middle transitional layer, the thickness and uniformity of a function barrier layer on the surface of the composite membrane and the interface acting force of a compact separation layer and the middle transitional layer can be rapidly and accurately adjusted and controlled by controlling interfacial polymerization and optimization, and accordingly the pervaporation performance of the composite membrane is enhanced.

Description

technical field [0001] The invention belongs to the field of preparation of separation composite membranes, and in particular relates to a new method for preparing nanofiber-based pervaporation composite membranes for organic solvent dehydration. Background technique [0002] As a new and effective liquid separation technology, pervaporation has the advantages of high separation efficiency and low energy consumption in the separation of azeotropes, near-boilers and temperature-sensitive liquids. It has been used in the dehydration of organic matter, the removal of trace organic matter in water and Organic mixtures are separated into three major domains. The pervaporation separation efficiency largely depends on the separation performance of the pervaporation membrane. Therefore, in order to promote the development of the pervaporation separation field, the preparation of high-performance separation membranes is still the focus of research at home and abroad. [0003] In re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D61/36
CPCB01D61/362B01D67/0079B01D69/12B01D69/125B01D2323/39
Inventor 王雪芬程诚李霈云沈克张同辉叶浩辉
Owner DONGHUA UNIV
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