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Asymmetrically porous ion exchange membranes and their method of manufacture

An ion-exchange membrane, asymmetric technology, applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of limited improvement and achieve the effect of low effective thickness, simple and effective method, and high porosity

Active Publication Date: 2018-07-31
MONASH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microstructure of the state-of-the-art membranes is still dense, so the improvement is limited

Method used

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  • Asymmetrically porous ion exchange membranes and their method of manufacture
  • Asymmetrically porous ion exchange membranes and their method of manufacture
  • Asymmetrically porous ion exchange membranes and their method of manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Example 1 - Fabrication for Anion Exchange Membrane Preparation Using a Single Modification Step

[0074] Commercially available bromomethylated poly(phenylene oxide) (BPPO) was used to prepare the ultrafiltration membranes of the present invention. BPPO is dissolved in N-methyl-2-pyrrolidone to form a casting solution, which is cast on glass through a micron film applicator, and then soaked in distilled water as a coagulation bath to obtain a solution with benzyl bromide Group (-CH 2 Br) ultrafiltration membrane. Then, the ultrafiltration membrane is modified by soaking in N,N,N',N'-tetramethylethylenediamine (TEMED) aqueous solution through a one-step method to obtain the final porous TPPO anion exchange membrane.

[0075] The concentration and thickness of the casting solution, the concentration of TEMED as a bifunctional reagent, the soaking temperature and time of the ultrafiltration membrane in the TEMED solution can be changed to produce asymmetric porous anion...

Embodiment 2

[0079] Example 2 - Fabrication for Anion Exchange Membrane Preparation Using Two-Step Modification

[0080] Commercial bromomethylated poly(phenylene oxide) (BPPO) was used as the starting material for ultrafiltration membrane preparation. It was dissolved in N-methyl-2-pyrrolidone to form a casting solution with a concentration of 30% by weight, which was cast on glass through a micron film applicator whose gap was set to 250 μm, and then soaked in distilled water In order to obtain a benzyl bromide group (-CH 2 Br) ultrafiltration membrane. The ultrafiltration membrane was then modified via a two-step process by immersing in an aqueous solution of butanediamine (BTDA) to obtain a cross-linked BBPPO membrane, which was then further immersed in an aqueous solution of trimethylamine (TMA) to obtain the final Porous BTPPO anion exchange membrane.

[0081] The concentrations of BTDA and TMA aqueous solutions as the first and second functional reagents, respectively, and the im...

Embodiment 3

[0086] Example 3 - Fabrication for Cation Exchange Membrane Preparation Using Two-Step Modification

[0087] Commercial bromomethylated poly(phenylene oxide) (BPPO) was used as the starting material for ultrafiltration membrane preparation. It was dissolved in N-methyl-2-pyrrolidone to form a casting solution with a concentration of 30% by weight, which was cast on glass through a micron film applicator whose gap was set to 250 μm, and then soaked in distilled water In order to obtain a benzyl bromide group (-CH 2 Br) ultrafiltration membrane. The ultrafiltration membrane was then modified via a two-step process by immersing in an aqueous solution of butanediamine (BTDA) to obtain a cross-linked BBPPO membrane, which was further immersed in an aqueous solution of chlorosulfonic acid to obtain the final porous cation exchange membrane.

[0088] The concentrations of BTDA and chlorosulfonic acid aqueous solutions as the first and second functional reagents, respectively, and ...

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Abstract

The invention relates to a membrane and method for its manufacture, the method including the steps of (1) providing of an ultrafiltration membrane, and (2) modification of the resultant ultrafiltration membrane to provide an asymmetric porous ion exchange membrane. The modification of the ultrafiltration membrane is typically carried out by (i) exposing said ultrafiltration membrane to a first functional reagent to provide a cross-linked ultrafiltration membrane, and then (ii) exposing said cross-lined ultrafiltration membrane to a second functional reagent to introduce positive charged groupsto produce an anion exchange membrane.

Description

technical field [0001] The present invention relates to the field of membrane technology. [0002] In one form, the present invention relates to novel asymmetric porous ion exchange membranes and methods of making the same. [0003] In a particular aspect, the invention is suitable for use as a diffusion dialysis membrane. [0004] It is convenient hereafter to describe the invention in relation to industrial diffusion dialysis membranes, however it should be realized that the invention is not limited to this use and may also be used, for example, in other applications, such as sodium salicylate (charged drug) recovery. Background technique [0005] It should be appreciated that any discussion of documents, devices, solutions or knowledge in this specification is included to explain the context of the invention. Furthermore, the discussion throughout this specification was prompted by the inventor's recognition and / or identification of certain related technical difficulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/00B01D71/00B01D67/00
CPCB01D61/243B01D69/02C08J5/2287B01D2325/14B01D2325/16B01D2325/42B01D67/0093B01D2325/0231B01D67/00933B01D71/5223B01D71/52B01D61/145B01D2325/023
Inventor 王焕庭林小城
Owner MONASH UNIV
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