Effect of oxidation process of asphaltenes present in oil refining wastes followed by XANES spectroscopies

BAVA, YANINA B.; M. F. ERBEN; GERONES, M; L. ANDRINI, L. , M. PELUFFO, N. A. DI CLEMENTE, T. DEL PANNO, GRIOVANETTI,

Campinas, San Pablo

Congreso; 28 Reunión Anual de Usuarios del LNLS; 2018

Laboratorio Nacional de Luz Sincrotrón

Asphaltenes are complex mixture of heteroatom rich aromatic hydrocarbons that are present as a solid suspension in crude oils. Sulphur is the most abundant heteroatom in the oil, present in the heavier fractions as asphaltenes and resins. Besides sulfur is a good marker of the alteration of oils because it is very sensitive to oxidation, and exhibits a range of oxidation states from -2 to +6. [1] The XANES spectroscopy is an appropriated technique for the speciation of chemical species and provide qualitative and quantitative information about the sulphur content in asphaltenes. [2] A large fraction of oil refining wastes contains hydrocarbons of high molecular weight and heteroatom rich aromatic hydrocarbons. [3] The general aim of this project is the remediation of oil bottom tank sludge and of a chronically hydrocarbon contaminated soil combining chemical oxidation followed by biological treatment. The knowledge of the Sulphur chemistry in asphaltenes extracted from oils bottom tank sludge before and after different oxidation treatments constitutes an important information for understanding such a complex system.