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Solid-phase extracting method of furfural component in transformer insulating oil

A technology of transformer insulating oil and furfural, which is used in instruments, scientific instruments, material separation, etc., can solve problems such as easy emulsification, and achieve the effects of satisfying quantitative analysis requirements, stable extraction rate, and high extraction rate.

Active Publication Date: 2015-04-22
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of efficient and highly selective adsorbent (stationary phase), solid phase extraction can significantly reduce the amount of solvent; the pretreatment process of solid phase extraction is simple and low cost, which overcomes the difficulty of processing large volumes of traditional liquid-liquid extraction enrichment technology Disadvantages such as easy emulsification of samples and extraction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:

[0027] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;

[0028] 2) Take 7mL of 100% chromatographically pure n-hexane with a medical glass needle, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;

[0029] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;

[0030] 4) Take 25mL of 100% chromatographically pure hexane with a medical glass needle, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furfural c...

Embodiment 2

[0033] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:

[0034] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;

[0035] 2) Use a medical glass needle to take 3mL of 100% chromatographically pure n-hexane, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;

[0036] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;

[0037] 4) Use a medical glass needle to take 15mL of 100% chromatographically pure n-hexane, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furf...

Embodiment 3

[0040] A kind of solid-phase extraction method of furfural component in the transformer insulating oil of the present invention, comprises the steps:

[0041] 1) At room temperature, install the Sep-Pak column produced by Waters on the vacuum extractor, and the inlet of the vacuum extractor must have an adjustable flow rate and a valve that can be closed;

[0042] 2) Use a medical glass needle to take 5mL of 100% chromatographically pure n-hexane, let it flow through the PEP-SPE cartridge at a constant speed to activate the column, and then vacuum the vacuum extractor to remove the residual n-hexane in the PEP-SPE cartridge;

[0043] 3) Take 10mL oil sample and flow through the PEP-SPE cartridge at a constant speed of 2mL / min, and the furfural in the oil is adsorbed in the PEP-SPE cartridge;

[0044] 4) Use a medical glass needle to take 20mL of 100% chromatographically pure n-hexane, and let it flow through the PEP-SPE small column at a constant speed to wash off the non-furf...

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PUM

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Abstract

The invention discloses a solid-phase extracting method of a furfural component in transformer insulating oil, which extracts the furfural component by utilizing a solid-phase extracting device with a high-selectivity solid-phase extracting PEP (Polar-Enhanced Polymer)-SPE (Solid Phase Extraction) small column; the solid-phase extracting method comprises the following steps: (1) installing the PEP-SPE small column on a vacuum extractor; (2) activating the column by utilizing normal hexane, and then removing the residual normal hexane; (3) getting an oil sample and enabling the oil sample to flow through the PEP-SPE small column at a constant speed, wherein furfural in the oil is adsorbed in the PEP-SPE small column; (4) cleaning non-furfural component left in the oil sample in the column by utilizing the normal hexane, and then removing the residual normal hexane; and (5) getting methanol to clean the furfural adsorbed in the PEP-SPE small column. The solid-phase extracting method disclosed by the invention has the beneficial effects that the furfural component in the transformer insulating oil is separated by adopting the solid-phase extracting method, operation method is simple, cost is low, extracting rate is high and stable, quantitative analysis requirements are satisfied, and beneficial reference is provided for analysis of subsequent furfural content and aging assessment of the transformer solid insulating material.

Description

technical field [0001] The invention relates to a method for extracting furfural components, in particular to a solid-phase extraction method for furfural components in transformer insulating oil. Background technique [0002] The inner insulation of the transformer is mainly composed of composite insulation composed of mineral oil and insulating paper or cardboard. As an organic insulating material, the insulating paper with cellulose as the main component will undergo thermal degradation under the action of heat, including the decomposition of the main chain. The polymerization reaction and the elimination reaction that removes the side group from the main chain produce a large amount of low molecular volatiles, which diffuse into the transformer oil. The degree of polymerization is a direct reflection of the mechanical properties of insulating paper, but the deterioration of different parts of the transformer winding will be different due to the difference in operating te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/08
Inventor 陈玉峰朱文兵朱孟兆杜修明辜超周加斌李贞尹奎龙
Owner STATE GRID CORP OF CHINA
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