Comparative Efficiency of Extraction Purification of Straight-Run Petroleum Fractions and Gas Oils of Secondary Oil-Refining Processes for Obtaining Marine Fuels

The work presents the results of single-stage extraction purification of straight-run kerosene, light and heavy diesel fractions, atmospheric gas oil, light vacuum gas oil, as well as visbreaking gas oil and light catalytic cracking gas oil, from sulfur- and nitrogen-containing components and polyaromatic hydrocarbons under the same conditions: a mixture of N-methylpyrrolidone–ethylene glycol of 60 : 40 wt % is used the extractant; the extractant : raw material mass ratio is 1 : 1; and the temperature is 40°C. It is established that the degree of extraction of extractable components from petroleum products of similar fractional composition increases in the following series: straight-run fractions \( < \) visbreaking gasoil \( < \) light catalytic cracking gas oil. In the production of marine fuels that meet environmental requirements, the most effective is the extraction purification of gas oils from secondary oil-refining processes, which have an increased content of heterocyclic sulfur and nitrogen compounds of an aromatic nature, and polyaromatic hydrocarbons with short alkyl substituents, stable in thermal and catalytic processes.