IONIC LIQUIDS AS EXTRAGENTS OF COMPOUNDS NEGATIVELY AFFECTING THE ENVIRONMENTAL PROPERTIES OF DIESEL FUEL

The results of scientific research in the field of liquid-liquid extraction purification of diesel distillates differing in the content of undesirable aromatic and sulfur compounds using various ionic liquids as a selective, environmentally friendly solvent are presented. Different extracting ability of ionic liquids (dipropylammonium, dibutylammonium and N-methylpyrrolidinium acetate, morpholinium formate) in relation to the extracted components of diesel distillate is shown. In particular, a high degree of purification of the hydrotreated diesel fraction was established when using N-methylpyrrolidinium acetate ionic liquid in the extraction process. The influence of the staged process of extraction purifica-tion of mixed diesel distillate based on straight-run diesel fraction (70% vol.) and secondary oil processing products - light gas oil coking and light gas oil catalytic cracking (30% vol.) on the degree of dearomatization and desulfurization of the fuel has been determined. A relatively high yield and degree of purification of diesel fuel were revealed when carrying out the process of extraction purification of the mixed diesel distillate with N-methylpyrrolidinium acetate ionic liquid in three stages. The extraction purification process was studied using IR and UV spectral analysis methods and the possibility of purifying three- and fourcyclic aromatic hydrocarbons from the mixture of straight-run diesel fraction and secondary petroleum products was established when carrying out the extraction process with N-methylpyrrolidinium acetate ionic liquid