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A preparation method of monolithic polysulfone bipolar membrane with porphyrin groups bonded to side groups

A porphyrin group, bipolar membrane technology, applied in chemical instruments and methods, ion exchange of chelates, membrane technology, etc. Clear and other problems, to achieve the effect of low transmembrane voltage and low resistance

Active Publication Date: 2022-04-05
河北森斯环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has several obvious disadvantages: first, the grafting rate is low, and the grafting uniformity is also poor; second, because the porous material is used as the base membrane, the grafted monomers on both sides avoid mutual penetration, and the bipolar membrane The middle interface layer is not clear; the third is that the method of co-radiation grafting will cause a large amount of monomers to self-polymerize, and the utilization rate of the monomers is very low, which is not suitable for industrial production; the fourth is to achieve the required grafting rate. The grafted membrane is cleaned and grafted again (similar to the above-mentioned U.S. patent soaking the monomer solution multiple times and polymerizing), so that the synthesis steps are increased; the fifth is affected by the grafted monomer, the bipolar membrane prepared in the paper, Regardless of its positive or negative side, the chemical stability and thermal stability of its functional groups with ion exchange capabilities are not high, thus greatly limiting its scope of use

Method used

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  • A preparation method of monolithic polysulfone bipolar membrane with porphyrin groups bonded to side groups
  • A preparation method of monolithic polysulfone bipolar membrane with porphyrin groups bonded to side groups
  • A preparation method of monolithic polysulfone bipolar membrane with porphyrin groups bonded to side groups

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 50.0g of bromomethylated polysulfone into a three-necked flask, dissolve it with 60mL of N-methylpyrrolidone, and set aside. Weigh again 38.9g 3,4,5-trimethoxyphenol and 7.85g NaOH, dissolve with 30mL N-methylpyrrolidone, stir at room temperature for 0.5h, add dropwise to bromomethylated polysulfone solution, stir at room temperature 10h, after the reaction is over, use a mixed solvent precipitant with a volume ratio of water and ethanol of 1:1 to precipitate the product. After filtering, the precipitate is rinsed with ethanol several times, and the precipitate is soaked in deionized water. After 24 hours, filter and precipitate The product was vacuum-dried at 70°C to prepare a methoxy-containing polysulfone polymer.

[0043]

[0044] (2) Weigh 50.0 g of methoxy-containing polysulfone polymer into a 500 mL three-neck flask, install a constant pressure dropping funnel, and protect it with a nitrogen balloon after vacuuming. Add 240mL of pre-dried dichloromet...

Embodiment 2

[0055] (1) Synthesis of water catalyst in the middle layer of bipolar membrane-side chain bonded porphyrin substituent PL-PSF polymer: In a 1000mL three-necked flask, add 50.0g of bromomethylated polysulfone polymer and 500mL of DMAc to be copolymerized After the substance is fully dissolved, the 200mL DMAc solution and 11.2g NaHCO 3 , put them into a three-necked flask, raise the temperature to 50°C under the protection of nitrogen, and react at a constant temperature for 5 hours. After the reaction, immediately cool the system to room temperature with an ice-water bath, and use a mixture of distilled water and methanol as a precipitant to precipitate the product polymerization The material was washed with the mixed solution several times, and dried in vacuum to obtain a polymer (PL-PSF) with porphyrin (PL) bonded to the side chain.

[0056]

[0057] (2) Take 50.0g of bromomethylated polysulfone into a three-necked flask, dissolve it with 500mL of N-methylpyrrolidone, and ...

Embodiment 3

[0068] (1) Synthesis of water catalyst in the middle layer of bipolar membrane-side chain bonded porphyrin substituent PL-PSF polymer: In a 100mL three-necked flask, add 10.0g of bromomethylated polysulfone polymer and 100mL of DMAc to be copolymerized After the substance is fully dissolved, 50mL DMAc solution and 2.4g NaHCO 3 , put them into a three-necked flask, raise the temperature to 50°C under the protection of nitrogen, and react at a constant temperature for 5 hours. After the reaction, immediately cool the system to room temperature with an ice-water bath, and use a mixture of distilled water and methanol as a precipitant to precipitate the product polymerization The material was washed with the mixed solution several times, and dried in vacuum to obtain a polymer (PL-PSF) with porphyrin (PL) bonded to the side chain.

[0069]

[0070] (2) Take 50.0g of bromomethylated polysulfone into a three-necked flask, dissolve it with 500mL of N-methylpyrrolidone, and set asi...

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Abstract

The invention relates to a method for preparing a monolithic polysulfone bipolar membrane with side groups bonded to porphyrin groups. The present invention uses bromomethylated polysulfone and bromomethylated polysulfone polymers as starting materials to synthesize polysulfone-based membrane mixed solutions containing porphyrin and epoxy group side groups respectively, and cast them on a clean A polysulfone-based membrane containing porphyrin and epoxy side groups was prepared by drying on a glass plate; after the base membrane was sulfonated, ammonized and quaternized, it was washed with deionized water to obtain a monolithic phthalocyanine-containing Poly(aryletherketone) bipolar membranes with side groups. The bipolar membrane prepared by the present invention adopts a nucleophilic substitution reaction, introduces an epoxy group on the polysulfone side group, introduces an anion and a cation exchange membrane method into the polysulfone molecular chain, and saves the film-forming process and avoids the carcinogen chlorine Use of methyl ether. The prepared bipolar membrane has self-catalysis, low bipolar membrane resistance and low transmembrane voltage. Long-term use, there will be no problems such as bubbling and cracking in the middle interface layer that are prone to occur during the use of composite bipolar membranes.

Description

technical field [0001] The invention relates to a method for preparing a monolithic polysulfone bipolar membrane with side groups bonded to porphyrin groups. Oxygen group polysulfone is blended into a membrane as a base membrane material, and anion and cation are introduced through epoxy group reaction on both sides of the base membrane to synthesize a monolithic polysulfone bipolar membrane containing porphyrin group. Background technique [0002] Bipolar membrane is a new branch developed on the basis of ion exchange membrane technology, and has rapidly developed into a research hotspot in the field of membrane technology. It is usually a functional membrane with a three-layer structure composed of an anion exchange layer, a cation exchange layer and an intermediate catalytic layer that splits water rapidly. Under the action of a DC electric field, the water in the interface layer of the bipolar membrane dissociates, and H is obtained on both sides of the membrane. + and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D71/68B01D67/00B01J45/00
CPCB01J45/00B01D71/68B01D71/82B01D67/0006
Inventor 黄雪红李晓燕丁富传
Owner 河北森斯环保科技有限公司
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