Composition and aggregative stability of the products of interaction between petroleum tar and phthalic anhydride at different ratios of reagents
D. S. KORNEEV1, E. M. OSNITSKY1, D. E. BELOUS1, A. S. SAVCHENKO1, N. N. SVIRIDENKO2, L. S. KLIMENKO1
1Yugra State University, Khanty-Mansiysk, Russia
2Institute of Petroleum Chemistry, Siberian Branch of Russian Academy of Sciences, Tomsk, Russia
Keywords: tar, asphaltenes, acylation, phthalic anhydride, composition, aggregation stability
Abstract
The influence of phthalic anhydride concentration in the reaction mixture on the composition and colloidal stability of the products of catalytic acylation of petroleum tar in the presence of AlCl3 has been assessed. Tar from the West Siberian oil and the products of its interaction with phthalic anhydride were used as the objects of investigation. The analysis of changes in the composition, structure and aggregation stability of tar and its components was carried out using liquid adsorption chromatography, IR spectroscopy, and visible spectrophotometry. The dynamics of asphaltene aggregate growth was estimated by the dynamic light scattering method. It has been found that at phthalic anhydride concentration of 25 % per tar mass, about 7 wt% of resins lose the ability to dissolve in n-alkanes and are converted into asphaltenes due to the incorporation of carboxybenzoyl radical into their molecular structure, which is confirmed by the results of IR spectroscopy. The process of tar acylation increases its colloidal stability by 20-30 %, depending on the ratio of reagents.
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