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Sulfonated polyethersulfone membrane, preparation method thereof and sulfonated polysulfone membrane as well as preparation method and application thereof

A technology of sulfonated polyethersulfone membrane and sulfonated polysulfone membrane, applied in the fields of sulfonated polyethersulfone membrane and its preparation, bipolar membrane electrodialysis device and separation of amino acid mixture, sulfonated polysulfone membrane and its preparation , can solve the problems of low separation efficiency, reduce the degree of separation of amino acids, and high resistance to macromolecular transmission, and achieve the effects of easy migration through the membrane, improved separation efficiency and current efficiency, and excellent mechanical properties

Inactive Publication Date: 2017-09-22
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, during the separation process, due to the migration of amino acid molecules, the pH of the solution will change, and amino acid molecules have different charges under different pH conditions, so the degree of separation of amino acids will be greatly reduced
In addition, most previous studies have focused on the separation of mixed amino acid solutions by dense commercial membranes, but due to the high resistance of dense commercial membranes to the transfer of macromolecules, the separation efficiency is low

Method used

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  • Sulfonated polyethersulfone membrane, preparation method thereof and sulfonated polysulfone membrane as well as preparation method and application thereof
  • Sulfonated polyethersulfone membrane, preparation method thereof and sulfonated polysulfone membrane as well as preparation method and application thereof
  • Sulfonated polyethersulfone membrane, preparation method thereof and sulfonated polysulfone membrane as well as preparation method and application thereof

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preparation example Construction

[0044] Specifically, the application also provides a method for preparing a sulfonated polyethersulfone membrane, including:

[0045] The sulfonated polyethersulfone is subjected to phase inversion in water to obtain a sulfonated polyethersulfone membrane.

[0046] In the process of preparing the sulfonated polyethersulfone membrane, the preparation of the sulfonated polyethersulfone has been described in detail above, and will not be repeated here. The phase inversion process is carried out in water, and the preparation of the sulfonated polyethersulfone membrane is specifically as follows:

[0047] mixing sulfonated polyethersulfone with an organic solvent to obtain a coating solution;

[0048] Coating the coating solution on the substrate, and soaking in water to obtain a sulfonated polyethersulfone membrane; the organic solvent is N-methylpyrrolidone or a mixed solution of N-methylpyrrolidone and dichloromethane; The temperature of the water is 0-35°C.

[0049] In the p...

Embodiment 1

[0089] Example 1 Preparation of Porous Sulfonated Polyethersulfone Membrane SPES-4 by Phase Inversion at Low Temperature

[0090] (1) Preparation of sulfonated polyethersulfone: 2kg polyethersulfone and 6.7L dichloromethane are mixed and added to the reaction kettle, and 6.8L dichloromethane solution is added while stirring to completely dissolve the polyethersulfone; then 1.5L Dichloromethane and 0.5L chlorosulfonic acid were mixed and added to the reaction kettle in two batches, stirred while adding, and reacted at 40°C for 20h; then the mixed solution was discharged from the bottom of the reaction kettle, put into 45°C water for precipitation, and obtained The solid was crushed with a crusher to obtain sulfonated polyethersulfone powder, which was washed with water until the cleaning solution was neutral, then filtered and dried at 90°C for 24 hours to obtain a finished sulfonated polyethersulfone product. The ion exchange capacity of sulfonated polyethersulfone was tested ...

Embodiment 2

[0098] Example 2 Porous Sulfonated Polyethersulfone Membrane SPES-4 Separation of Amino Acids by Bipolar Membrane Electrodialysis (BMED)

[0099] Carry out BMED experiment to the SPES-4 film that embodiment 1 obtains, and BMED device schematic diagram is as figure 1 , The BMED device consists of a membrane stack device (1), a feed liquid tank (2), a recovery tank (3), an electrode liquid tank (4), a first peristaltic pump (5), a second peristaltic pump (6), a third peristaltic pump Pump (7), DC power supply (8), anode plate (9) and cathode plate (10); the bipolar membranes (BP-1) and (BP-2) used in the membrane stack device (1) are German Fumatech The FBM membrane provided by the company, the cation exchange membrane (C) is the SPES-4 membrane prepared in Example 1; the placement sequence of different membranes is as follows figure 2 As shown, from the anode to the cathode, the bipolar membrane (BP-1), cation exchange membrane (C), bipolar membrane (BP-2), plexiglass separat...

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Abstract

The invention provides a sulfonated polyethersulfone membrane, a preparation method thereof, a sulfonated polysulfone membrane and a preparation method thereof. The sulfonated polyethersulfone membrane provided by the application is prepared from sulfonated polyethersulfone through a phase inversion method; similarly, the sulfonated polysulfone membrane is prepared from sulfonated polysulfone through the phase inversion method. The application also provides a bipolar membrane electrodialysis device. A cation exchange membrane of the bipolar membrane electrodialysis device adopts the sulfonated polyethersulfone membrane or the sulfonated polysulfone membrane. The application also provides a method for separating an amino acid mixed solution by utilizing the bipolar membrane electrodialysis device. The sulfonated polyethersulfone membrane and the sulfonated polysulfone membrane which are prepared by the preparation methods have excellent mechanical performance, electrical performance and stability, are of porous structures, and are used for a bipolar membrane electrodialysis process to separate the amino acid mixed solution; an amino acid molecule with a positive charge more easily migrates to pass through the membranes; thus, higher recovery rate and current efficiency are obtained.

Description

technical field [0001] The invention relates to the technical field of cation exchange membranes, in particular to a sulfonated polyethersulfone membrane and a preparation method thereof, a sulfonated polysulfone membrane and a preparation method thereof, a bipolar membrane electrodialysis device and a method for separating amino acid mixed liquid. Background technique [0002] As the raw material of many foods and chemicals, amino acids have important food and commercial value. Amino acids can be produced by fermentation, enzymatic catalysis or chemical synthesis. The amino acid mother liquor obtained has complex components and many by-products, so further separation and purification are required. Traditional membrane separation technologies such as ultrafiltration and nanofiltration mainly use the difference in membrane pore size and molecular size to separate different components, so it is difficult to separate mixed amino acids with close molecular weights. [0003] As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D61/44B01D61/48B01D67/00C07C227/40C07C229/24C07C229/26
CPCB01D61/445B01D61/48B01D61/485B01D67/0009B01D67/0088B01D71/68C07C227/40C07C229/24C07C229/26
Inventor 吴翠明汪国胜张旭吴永会徐传芹
Owner HEFEI UNIV OF TECH
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