Extraction-chromatographic determination of the composition of the gasoline fraction of pyrolyzed automobile tires, hydrogenated on various catalysts

Using preliminary extraction sample preparation and subsequent GC-MS analysis, as well as standard physicochemical methods for analyzing petroleum products, the hydrocarbon composition of the gasoline fraction (boiling point range of 32–180 °C) of tire pyrolysate was determined before and after its hydrogenation on aluminoplatinum and aluminumnickel-molybdenum catalysts. Using extraction, it was found that the studied fraction contains small amounts of watersoluble components. Treatment of the fraction with oleum made it possible to selectively determine the content of saturated hydrocarbons in the pyrolysate, since alkenes and arenes are destroyed by oleum. Based on the results obtained, it was concluded that the original gasoline fraction of the pyrolysate cannot be used as a component of motor fuels due to the high content of sulfur and alkenes. Hydrogenation on a platinum catalyst significantly reduces the content of sulfur and alkenes, but it remains quite high. The use of an alumina-nickel-molybdenum catalyst in hydrotreating allows for a sharp reduction in the content of the above components, but at the same time the content of aromatic hydrocarbons increases significantly. The pyrolysate obtained during hydrogenation on this catalyst can be considered as a potential additive to commercial petroleum products, since it contains virtually no sulfur or olefins.

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