Comprehensive two-dimensional gas chromatography quantitative analysis method of aromatic sterane compound in petroleum
A two-dimensional gas chromatography and aromatic sterane technology, which is applied in the field of petroleum sample analysis, can solve the problems affecting the qualitative and quantitative of mono-aromatic sterane, etc., and achieves the effects of reliable geochemical parameters, elimination of normal alkane interference, and accurate determination.
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[0031] (1) Sample pretreatment
[0032] In this example, the crude oil sample was collected from the Yajiao-Xingou low uplift of Jianghan Oilfield. First, about 30 mg of the crude oil sample was taken, dissolved in an appropriate amount of n-hexane, and left standing for 12 hours overnight. Use a funnel plugged with absorbent cotton to filter out asphaltenes, collect the filtrate in an Erlenmeyer flask, remove the Erlenmeyer flask after filtration, replace it with a small beaker, and rinse with chloroform to obtain asphaltene. The Erlenmeyer flask was rotatably evaporated in a water bath at 46°C to about 3ml to obtain a filtrate concentrate.
[0033]Take the absorbent cotton, fine silica gel and alumina (mass ratio 3:2) activated by chloroform extraction and put them into a glass chromatography column in sequence, add n-hexane to rinse, wait until the bubbles are completely discharged, and then add the filtrate concentrate to the glass chromatography column. In the column, wh...
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