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Pervaporation separation membrane and preparation method thereof

A technology for pervaporation and separation membranes, which is applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problem of not considering the interaction between the base membrane and the pervaporation composite layer, and achieve good application prospects and strengthen the composite layer. Good strength and separation performance

Inactive Publication Date: 2016-11-16
JIANGSU SOPO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent "A Fluorine-Containing Acrylate Copolymer Pervaporation Composite Membrane and Its Preparation Method" discloses a fluorine-containing acrylate copolymer pervaporation composite membrane, which includes a support layer and an active separation layer, and the active separation layer is evenly distributed on the On the support layer, the support layer is a polytetrafluoroethylene microporous support membrane, and the active separation layer is a fluorine-containing acrylate copolymer, and the above-mentioned interaction between the base membrane and the pervaporation composite layer is not considered.

Method used

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  • Pervaporation separation membrane and preparation method thereof
  • Pervaporation separation membrane and preparation method thereof
  • Pervaporation separation membrane and preparation method thereof

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Embodiment 1

[0024] Polyacrylonitrile-based membranes (such as figure 1 Shown) Soak statically in 0.5% NaOH aqueous solution for 3 hours, then alternately shake and wash with ethanol and deionized water, and fully infiltrate in ethanol; dissolve dopamine in deionized water, and prepare a dopamine solution with a concentration of 2.0mg / L Soak the basement membrane in the dopamine solution, shake it in a shaking incubator with a rotation speed of 100r / min and a temperature of 25°C for 24 hours, then wash it with ethanol and deionized water alternately, and remove the basement membrane with a polydopamine composite layer. Soak in 0.5wt% polyvinyl alcohol aqueous solution at 40°C for 4h, shake and wash with deionized water; then immerse the obtained film in 0.5% glutaraldehyde aqueous solution at 60°C for cross-linking for 5h; shake and wash with deionized water , to produce a pervaporation membrane, such as figure 2 A scanning electron microscope photograph of its surface is shown, image ...

Embodiment 2

[0027] Soak the polyacrylonitrile-based membrane statically in 0.5% NaOH aqueous solution for 3 hours, then alternately wash it with ethanol and deionized water, and fully infiltrate it in ethanol; dissolve dopamine in a Tris-HCl buffer solution with a pH of 8.0, Prepare a dopamine solution with a concentration of 1.0 mg / L; soak the basement membrane in the dopamine solution, shake for 24 hours in a shaking incubator with a rotation speed of 100r / min and a temperature of 25°C, and then alternately shake and wash with ethanol and deionized water. Soak the base film with a polydopamine composite layer in a 0.5wt% polyvinyl alcohol aqueous solution at a temperature of 40°C for 4h, shake and clean it with deionized water; then immerse the obtained film in a 0.5% glutaraldehyde aqueous solution at 60°C Cross-link for 5 hours; shake and wash with deionized water to prepare a pervaporation membrane.

[0028] The dehydration performance of the membrane to ethyl acetate was measured an...

Embodiment 3

[0030] Soak the polyacrylonitrile-based membrane statically in 0.5% NaOH aqueous solution for 3 hours, then alternately wash it with ethanol and deionized water, and fully infiltrate it in ethanol; dissolve dopamine in a Tris-HCl buffer solution with a pH of 8.0, Prepare a dopamine solution with a concentration of 2.0 mg / L; soak the basement membrane in the dopamine solution, shake for 24 hours in a shaking incubator with a rotation speed of 100r / min and a temperature of 25°C, and then alternately shake and wash with ethanol and deionized water. Soak the base film with a polydopamine composite layer in a 0.5wt% polyvinyl alcohol aqueous solution at a temperature of 40°C for 4h, shake and clean it with deionized water; then immerse the obtained film in a 0.5% glutaraldehyde aqueous solution at 60°C Cross-link for 5 hours; shake and wash with deionized water to prepare a pervaporation membrane.

[0031] The dehydration performance of the membrane to ethyl acetate was measured and ...

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Abstract

The invention discloses a pervaporation separation membrane and a preparation method thereof. The pervaporation separation membrane is prepared by stably polymerizing dopa or dopamine on the surface of a base membrane, and performing grafting and cross-linking. According to the pervaporation separation membrane and the preparation method thereof, a polydopa or polydopamine composite layer which can be firmly combined with the base membrane on the basis of a biological bonding principle is obtained; the composite layer is directly cross-linked with hydroxyls in a long-chain molecule, so that the pervaporation separation membrane which is high in hydrophility, permeation flux, separation performance and membrane stability is prepared. The preparation process is simple and convenient; raw materials are easy to obtain; the condition is mild; the prepared pervaporation membrane is used for separating ethyl acetate from water, and has relatively high permeation flux and membrane stability.

Description

technical field [0001] The invention relates to a preparation method of a composite membrane, in particular to a pervaporation separation membrane and a preparation method thereof, belonging to the field of separation membrane composite materials. Background technique [0002] Pervaporation is a new type of membrane separation technology. It uses the different dissolution and diffusion properties of different components in the membrane to achieve separation. It has low energy consumption, environmental friendliness, is not limited by gas-liquid balance, simple process, and convenient operation. Etc. At the same time, pervaporation can also be coupled with rectification, adsorption and other processes to transform traditional processes, and thus obtain huge energy-saving effects. Pervaporation membranes can be divided into homogeneous membranes and composite membranes according to their structure. The homogeneous membrane is thicker, the resistance of the components to pass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D71/60B01D69/12B01D67/00B01D69/02
CPCB01D67/0006B01D67/0093B01D69/02B01D69/12B01D71/60B01D71/76B01D2323/02B01D2323/06B01D2325/30B01D2325/36
Inventor 吴青龙史宏谢吉民刘玲范俭青朱桂生周祖涛唐丽
Owner JIANGSU SOPO GRP
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