GC evaluation of the sulfur containing compounds profile in the petroleum aromatic fractions
Abstract
The possibility of using gas chromatography with flame photometric detection for estimating of the profile of sulfur-containing compounds was demonstrated for five aromatic fractions of oil of different origin. Utilization of sulfur-selective detector allows one to evaluate samples of aromatic fractions by the total content of sulfur compounds, considering the mutual overlap of peaks of aromatic hydrocarbons and their sulfur-containing analogs. This fact requires constructing a calibration characteristic for BT and/or DBT. The latter was used in the paper for construction of the Shewhart control charts. It was shown that GC-FID separation did not allow one to distinguish between samples of aromatic fractions with sufficient confidence. Using the GC-MS method, the nature of some sulfur compounds in the sample was clarified and the presence of mutual overlap of peaks of aromatic hydrocarbons and their sulfur-containing analogs was confirmed. In this regard, the construction of the profile of sulfur compounds was performed using a sulfur-selective detector, for which PFPD was chosen. To obtain a numerical description of the samples, it was proposed to use the ratio of the peak areas of isomeric methylethylbenz[b]thiophenes obtained with process control using Shewhart charts as a characteristic value. Using the one-year-long study of the same sample, it was shown that the ratio value remains constant within the error limits during the year, which allows this value to be used as a characteristic value for aromatic fractions.
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