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

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...

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