Home – Home – Jornals – Chemistry for Sustainable Development 2018 number 1

The paper presents results of comparative study of composition and structure of nitrogen-containing resin bases of heavy oil from the Usinsk field before and after thermal effects at 450 ^oС for 30 min. Different molecular mass nitrogen-containing bases are isolated using sedimentation methods with hydrogen chloride and sulphuric-acid extraction from initial and thermolised resins. High molecular mass compounds comprise the bulk of bases in both cases, however, their fraction in thermolysed resins is substantially lower. Thermally transformed bases have lower masses compared to the initial ones. Structural group analysis and gas chromatographic mass spectrometry techniques examine the composition of the isolated compounds. Middle molecules of nitrogen-containing resin bases of both types consist of polycyclic rings that include aromatic and saturated cycles with different alkyl frames, as demonstrated. Average species of thermolysed resin compounds are more aromatic due to a decrease in the fraction of naphthene and alkyl fragments. In the composition of bases of initial and thermolysed resins, there are alkyl derivatives of quinoline, benzoquinoline, dibenzoquinoline, and azapyrene, the maximum of the distribution of which falls at alkylbenzoquinolines. The fraction of alkylquinolines is elevated among azaarenes of thermolysed resins. A higher fraction of structures with a lower number of carbon atoms in alkyl substituents is typical for all types of bases of thermolysed resins. It may be assumed that the identified compounds would enter into the composition of distillate fractions during thermal processing of heavy hydrocarbon raw materials. This is necessary to consider in solving issues related to preparation of high-quality fuels and lubricants based thereon.