Chitosan quaternary ammonium salt and phytic acid porous composite membrane and method for removing metal impurities

A technology of chitosan quaternary ammonium salt and porous composite membrane, which is applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of undiscovered modified chitosan, etc., and achieve The regeneration process is simple and the operation is simple and convenient.

Inactive Publication Date: 2018-12-28
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there is no discovery about the application of modified chitosan, especially chitosan quaternary ammonium salt and phytic acid in reducing metal impurities in transformer oil.

Method used

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  • Chitosan quaternary ammonium salt and phytic acid porous composite membrane and method for removing metal impurities
  • Chitosan quaternary ammonium salt and phytic acid porous composite membrane and method for removing metal impurities
  • Chitosan quaternary ammonium salt and phytic acid porous composite membrane and method for removing metal impurities

Examples

Experimental program
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Effect test

Embodiment 1

[0045] S101. Dissolve 2g of chitosan quaternary ammonium salt in deionized water, add 0.5g of glycerin, and stir evenly to obtain a solution with a concentration of 2g / 100ml chitosan quaternary ammonium salt; dissolve 0.6g of phytic acid powder in deionized In water, obtain the phytic acid aqueous solution that concentration is 0.05g / ml;

[0046] S102. Slowly add the phytic acid aqueous solution dropwise into the chitosan quaternary ammonium salt solution under stirring to obtain a chitosan quaternary ammonium salt phytic acid mixture;

[0047] S103. placing the chitosan quaternary ammonium salt phytic acid mixture in a refrigerator, freezing overnight under 0°C, and then freeze-drying to obtain a porous composite membrane;

[0048] S104. Finally, the freeze-dried porous composite membrane is placed at a temperature of 20° C. and a relative humidity of 95% in a constant temperature and humidity chamber for 24 hours to balance the moisture content of the obtained chitosan quate...

Embodiment 2

[0052] S201. Dissolve 2g of chitosan quaternary ammonium salt in deionized water, add 0.3g of propylene glycol and 0.3g of butanediol, stir well, and obtain a concentration of 1.5g / 100ml chitosan quaternary ammonium salt solution; Phytic acid powder was dissolved in deionized water to obtain a phytic acid aqueous solution with a concentration of 0.3g / ml;

[0053] S202. Slowly add the phytic acid aqueous solution dropwise into the chitosan quaternary ammonium salt solution under stirring state to obtain the chitosan quaternary ammonium salt phytic acid mixture;

[0054] S203. placing the chitosan quaternary ammonium salt phytic acid mixture in a refrigerator, freezing overnight under 0°C, and then freeze-drying to obtain a porous composite membrane;

[0055] S204. Finally, placing the freeze-dried porous composite membrane at a temperature of 25° C. and a relative humidity of 85% in a constant temperature and humidity chamber for 18 hours to balance the moisture content of the ...

Embodiment 3

[0059] S301. Dissolve 2g of chitosan quaternary ammonium salt in deionized water, add 0.1g of glycerin, 0.25g of propylene glycol and 0.2g of butanediol, stir well to obtain a concentration of 3g / 100ml chitosan quaternary ammonium salt solution ; Dissolving 1 g of phytic acid powder in deionized water to obtain a phytic acid aqueous solution with a concentration of 0.1 g / ml;

[0060] S302. Slowly add the phytic acid aqueous solution into the chitosan quaternary ammonium salt solution dropwise under stirring state to obtain the chitosan quaternary ammonium salt phytic acid mixture;

[0061] S303. placing the chitosan quaternary ammonium salt phytic acid mixture in a refrigerator, freezing overnight under 0°C, and then freeze-drying to obtain a porous composite membrane;

[0062] S304. Finally, placing the freeze-dried porous composite membrane at a temperature of 40° C. and a relative humidity of 80% in a constant temperature and humidity chamber for 12 hours to balance the moi...

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Abstract

The invention provides a chitosan quaternary ammonium salt and phytic acid porous composite membrane and a method for removing metal impurities. The chitosan quaternary ammonium salt and phytic acid porous composite membrane is prepared with the following method: dissolving chitosan quaternary ammonium salt in water, adding a plasticizer, and performing stirring uniformly to obtain a chitosan quaternary ammonium salt solution; dissolving phytic acid powder in water to obtain a phytic acid aqueous solution; adding the phytic acid aqueous solution dropwise slowly to the chitosan quaternary ammonium salt solution under stirring to obtain a mixed solution; freezing the mixed solution, and performing freeze-drying to obtain the porous composite membrane; placing the porous composite membrane ina constant temperature and constant humidity box to obtain the chitosan quaternary ammonium salt and phytic acid porous composite membrane. The method for removing the metal impurities comprises thefollowing steps: mixing the chitosan quaternary ammonium salt and phytic acid porous composite membrane with to-be-treated mineral oil, and performing filtering after reaction. The chitosan quaternaryammonium salt and phytic acid porous composite membrane has larger specific surface area, excellent structural integrity and good contact adsorption, can effectively remove the metal impurities, is simple and convenient to operate, and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to the field of modified chitosan composite membranes, in particular to a chitosan quaternary ammonium salt phytic acid porous composite membrane and a method for removing metal impurities. Background technique [0002] As one of the important components of transformers, the quality of insulating oil plays an important role in the safe and stable operation of transformers. In order to ensure the normal operation of the transformer, it is necessary to continuously detect the quality of the transformer oil and update the transformer oil. In recent years, due to the impurity metals contained in transformer oil at home and abroad, a large number of power accidents have been caused, resulting in major economic losses, and the discarded transformer oil contains a large amount of harmful substances, which will seriously pollute the environment if it is not handled carefully. How to effectively remove metal impurities in transformer oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01D15/08
CPCB01D15/08B01J20/24B01J20/28033
Inventor 郑科旺李伟王伟黄超凡覃彩芹
Owner HUBEI ENG UNIV
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