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Chitosan-phytic acid porous composite membrane, and method for removing metal impurities

A porous composite membrane and chitosan technology, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems that have not been found in the application of phytic acid, and achieve excellent structural integrity, Good contact adsorption and easy regeneration

Inactive Publication Date: 2019-01-11
HUBEI ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The application of phytic acid in reducing metal impurities in transformer oil has not been found so far

Method used

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  • Chitosan-phytic acid porous composite membrane, and method for removing metal impurities
  • Chitosan-phytic acid porous composite membrane, and method for removing metal impurities
  • Chitosan-phytic acid porous composite membrane, and method for removing metal impurities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] S101. Dissolving 2g of chitosan powder in 100ml of acetic acid aqueous solution with a volume fraction of 1%, adding 0.5g of glycerin, stirring evenly to obtain a chitosan solution with a concentration of 2g / 100ml; dissolving 0.4g of phytic acid powder in 5ml In deionized water, a phytic acid aqueous solution with a concentration of 0.08g / ml was obtained;

[0048] S102. Slowly add the phytic acid aqueous solution into the chitosan solution dropwise under stirring state to obtain the chitosan phytic acid mixed solution;

[0049] S103. placing the chitosan and phytic acid mixture in a refrigerator, freezing overnight at a temperature below 0°C, and then freeze-drying to obtain a porous composite membrane;

[0050]S104. Finally, the freeze-dried porous composite membrane is placed in a constant temperature and humidity chamber with a relative humidity of 80% for 24 hours at a temperature of 25° C. to balance the moisture content of the obtained chitosan phytic acid porous ...

Embodiment 2

[0054] S201. Dissolving 1g chitosan powder in 100ml volume fraction is 2% acetic acid / hydrochloric acid aqueous solution (acetic acid and hydrochloric acid each account for half), add propylene glycol of 0.3g, stir well, obtain concentration and be 1g / 100ml chitosan solution; Dissolve 1 g of phytic acid powder in 5 ml of deionized water to obtain a phytic acid aqueous solution with a concentration of 0.2 g / ml;

[0055] S202. Slowly add the phytic acid aqueous solution into the chitosan solution dropwise under stirring state to obtain the chitosan phytic acid mixed solution;

[0056] S203. placing the chitosan and phytic acid mixture in a refrigerator, freezing overnight at a temperature below 0°C, and then freeze-drying to obtain a porous composite membrane;

[0057] S204. Finally, the freeze-dried porous composite membrane is placed in a constant temperature and humidity chamber with a relative humidity of 90% at a temperature of 20° C. for 24 hours to balance the moisture co...

Embodiment 3

[0061] S301. 2.5g chitosan powder is dissolved in 100ml volume fraction and is 1.5% acetic acid / hydrochloric acid / lactic acid mixed aqueous solution (acetic acid, hydrochloric acid, lactic acid each account for 1 / 3rd), adding mass fraction is 0.7g butanediol, Stir evenly to obtain a chitosan solution with a concentration of 2.5g / 100ml; dissolve 0.2g of phytic acid powder in 5ml of deionized water to obtain a phytic acid aqueous solution with a concentration of 0.04g / ml;

[0062] S302. Slowly add the phytic acid aqueous solution into the chitosan solution dropwise under stirring state to obtain the chitosan phytic acid mixed solution;

[0063] S303. placing the chitosan and phytic acid mixture in a refrigerator, controlling to freeze overnight below 0°C, and then freeze-drying to obtain a porous composite membrane;

[0064] S304. Finally, the freeze-dried porous composite membrane is placed in a constant temperature and humidity chamber with a relative humidity of 75% at a temp...

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Abstract

The invention provides a chitosan-phytic acid porous composite membrane, and a method for removing metal impurities. A production method of the chitosan-phytic acid porous composite membrane comprisesthe following steps: dissolving chitosan powder in an acid solution, adding a plasticizer, and performing uniform mixing to obtain a chitosan solution; dissolving phytic acid powder in water to obtain an aqueous phytic acid solution; slowly dropwise adding the aqueous phytic acid solution to the chitosan solution while stirring in order to obtain a chitosan and phytic acid mixed solution; freezeing the chitosan-phytic acid mixed solutionn, and then freeze-drying the frozen mixed solution to obtain a porous composite membrane; and placing the chitosan-phytic acid porous composite membrane in aconstant temperature and humidity chamber to obtain the chitosan-phytic acid porous composite membrane. The method for removing metal impurities comprises the following steps: mixing of the chitosan-phytic acid porous composite membrane with mineral oil to be treated, reacting, and filtration. The chitosan-phytic acid porous composite membrane has the advantages of large specific surface area, excellent structural integrity, good contact adsorption property, effectiveness in removal of the metal impurities, simplicity and convenience in operation, and suitableness for large-scale industrial applications.

Description

technical field [0001] The invention relates to the field of modified chitosan composite membranes, in particular to a chitosan phytic acid porous composite membrane and a method for removing metal impurities. Background technique [0002] The removal of metal impurities in mineral oil has always been a difficult problem in the recycling of mineral oil. There are problems such as low removal efficiency, complicated post-treatment, and easy to cause secondary pollution. [0003] Transformer oil refers to the mineral insulating oil of natural hydrocarbon mixture obtained from petroleum refining. As the main insulation and cooling medium of oil-filled high-voltage electrical appliances, transformer oil is widely used in transformers and circuit breakers. In order to ensure the economical production, smooth transmission, and safe storage and use of electric energy, it is necessary to ensure the reliable operation of transformers. However, among the faults of transformers, a con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
CPCB01J20/24B01J20/28033
Inventor 郑科旺李伟王伟黄超凡覃彩芹
Owner HUBEI ENG UNIV
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