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N-trimethyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil

A technology of trimethyl chitosan microspheres and trimethyl chitosan, which is applied in the fields of refining hydrocarbon oil, chemical instruments and methods, petroleum industry, etc., can solve the problem of reducing chelation, electric neutralization and adsorption bridging. , The separation of adsorbent and oil is difficult, unfavorable for practical production and application, etc., to achieve the effect of convenient operation, no pollution hazards, stable and reliable structure

Inactive Publication Date: 2018-04-06
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art documents cited above show obvious deficiencies in the application of chitosan adsorbents in transformer oil regeneration. This technical document utilizes chitosan and oil products for stirring and blending, resulting in flocculent chitosan being dispersed in Among lubricating oils with high viscosity, although the purpose of reducing the acid value through flocculation can be achieved, it is difficult to separate the suspended adsorbent from the oil, which is not conducive to practical production and application. In addition, the hydrogen bond of chitosan itself The force will reunite the molecular chains, reduce the actual contact area with the oil, and reduce its chelation, electrical neutralization and adsorption bridging effects

Method used

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  • N-trimethyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil
  • N-trimethyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil
  • N-trimethyl chitosan microsphere, and preparation method and application thereof in reducing dielectric loss of mineral oil

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preparation example Construction

[0033] The present embodiment provides a kind of preparation method of N-trimethyl chitosan microsphere, comprises the following steps:

[0034] S1, after mixing chitosan, sodium iodide and N-methyl-2-pyrrolidone, the reaction solution is obtained in the dark, and the first sodium hydroxide solution and methyl iodide are added to the reaction solution to obtain the solution in the dark reaction, and then the The solution is precipitated with ethanol, separated and dried to obtain N-trimethyl chitosan; wherein the degree of quaternization substitution of N-trimethyl chitosan is 10-20%; wherein the viscosity of chitosan is preferably 0.25 ~0.65Pa·s; preferably, chitosan, sodium iodide and N-methyl-2-pyrrolidone are mixed in a mass ratio of 1~2:3~4:30~40 and protected from light at 50~70°C React for 0.5-2 hours to obtain a reaction solution. Further preferably, adding the first sodium hydroxide solution and methyl iodide to the reaction solution with a mass fraction of 5 to 20% ...

Embodiment 1

[0044] The present embodiment provides a kind of N-trimethyl chitosan microsphere, and its specific preparation method is as follows:

[0045] S101, prepare N-trimethyl chitosan solution with a mass fraction of 0.5% (quaternization degree of substitution 14.6%); mix chitosan, sodium iodide and N-methyl-2-pyrrolidone at 2:4: Mix at a mass ratio of 40 and react in the dark at 60°C for 1 h to obtain a reaction solution, add 20 ml of the first sodium hydroxide solution with a mass fraction of 10% and 20 ml of methyl iodide to react for 1 to 2 h to obtain a solution, and then add the solution Precipitate, separate and dry with ethanol to obtain N-trimethyl chitosan, and dissolve N-trimethyl chitosan in water to prepare a N-trimethyl chitosan solution with a mass fraction of 0.5%; wherein the shell The viscosity of polysaccharide is 0.48Pa·s;

[0046] S102. Disperse the N-trimethyl chitosan solution with a mass fraction of 0.5% in an aqueous solution of sodium polyphosphate with a ...

Embodiment 2

[0050] The present embodiment provides a kind of N-trimethyl chitosan microsphere, and its specific preparation method is as follows:

[0051] S201, prepare N-trimethyl chitosan solution with a mass fraction of 2% (quaternization degree of substitution 14.6%); mix chitosan, sodium iodide and N-methyl-2-pyrrolidone at 2:4: Mix at a mass ratio of 40 and react in the dark at 60°C for 1 h to obtain a reaction solution, add 20 ml of the first sodium hydroxide solution with a mass fraction of 10% and 20 ml of methyl iodide to react for 1 to 2 hours to obtain a solution, and then add the solution Precipitate, separate and dry with ethanol to obtain N-trimethyl chitosan, and dissolve N-trimethyl chitosan in water to prepare a N-trimethyl chitosan solution with a mass fraction of 2%; wherein the shell The viscosity of polysaccharide is 0.54Pa·s;

[0052] S202. Disperse an aqueous solution of N-trimethyl chitosan with a mass fraction of 2% in an aqueous solution of sodium polyphosphate...

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Abstract

The invention provides an N-trimethyl chitosan microsphere, and a preparation method and an application thereof in reducing dielectric loss of mineral oil, and belongs to the field of modified chitosan. The preparation method comprises the following steps: mixing chitosan, sodium iodide, and N-methyl-2-pyrrolidone to carry out reactions, then adding sodium hydroxide and methyl iodide to carry outreactions; adding ethanol to carry out precipitation, performing separation and freeze-drying to obtain N-trimethyl chitosan with a quaternization substitution degree of 10-20%; preparing a N-trimethyl chitosan solution, spraying the N-trimethyl chitosan solution into sodium polyphosphate to carry out crosslinking reactions; washing the reaction product by water, filtering, adding the reaction product into a sodium hydroxide solution, stirring, adding epoxy chloropropane to carry out reactions to obtain microspheres; washing the microspheres by water, then washing microspheres by organic solvents with volume percentages of 10-20%, 30-40%, 70-80%, and 90-95%, and carrying out freeze-drying. The prepared modified chitosan can reduce the dielectric loss of mineral oil.

Description

technical field [0001] The invention relates to the field of modified chitosan, in particular to a kind of N-trimethyl chitosan microsphere, its preparation method and its application in reducing the dielectric loss of mineral oil. Background technique [0002] 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. The simplified inspection of transformer oil includes the following items: oil appearance, flash point, pressure resistance, water-soluble acid (pH value), acid value, micro-water, chromatography, gas content in oil, dielectric loss factor, etc., among which the transformer oil is not The main reasons for the qualification are as follows: 1. The micro-water in the oil exceeds the standard, which will cause the oil pressure to fail to meet the r...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C10G25/00
CPCB01J20/24B01J20/28021B01J2220/4825C10G25/003
Inventor 李伟郑科旺黄超凡罗彪陈阳王振宇彭科张贤覃彩芹
Owner HUBEI ENG UNIV
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