Oxidative desulphurisation of diesel fraction using metal-containing imidazole-based ionic liquids
N. S. KOBOTAEVA, YU. V. SAVINYKH
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: imidazole-containing ionic liquids, metal salts, FeCl3, SnCl4, ZnCl2, СоС12, МnС12, dibenzothiophene homologues, oxidative catalytic desulphurisation, diesel fraction
Abstract
The catalytic oxidation and extraction of sulphur-containing compounds of the diesel fraction by metal-containing ionic liquids based on imidazolium bromide (IL) and metal salts (FeCl3, SnCl4, ZnCl2, СоС12, МnС12) have been investigated. The composition of sulphur-containing compounds and polycyclic aromatic hydrocarbons in the initial and purified diesel fraction was determined by gas chromatography - mass spectrometry. The optimal conditions for oxidation and extraction have been determined: temperature 30 °C, extraction time 60 min, the molar ratio IL / metal salt = 1 : 0.25. A higher degree of sulphur-containing compounds removal (80-95 %) is observed in the systems ILFeCl3, ILSnCl4, ILZnCl2. Results of the studies of group and individual composition of dibenzothiophene derivatives have shown that in terms of recovery degree the homologues are ranged as follows: dibenzothiophene > trimethyldibenzothiophene > methyldibenzothiophene > dimethyldibenzothiophene. The efficiency of extraction of naphthalene and phenanthrene homologues is 75-80 %.
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