Effect of aluminium and zinc additives on the composition of nitrogenous bases generated during the conversion of natural asphaltite in supercritical water
V. R. ANTIPENKO1, S. S. ZHBANOVA1, O. N. FEDYAEVA2, A. A. VOSTRIKOV2
1Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
2Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: natural asphaltite, supercritical water, thermolysis, nitrogenous bases, composition
Abstract
A comparative analysis of the composition of low-molecular nitrogenous bases (NBs) in high-sulphur natural asphaltite and liquid products of its conversion in supercritical water (SCW) at 400 C and 30 MPa with and without the presence of aluminium and zinc additives was carried out for the first time. Based on the results of analysis of NB extracts by gas chromatography - mass spectrometry, the trends have been revealed in the changes of structural-group and molecular composition of various NB types due to changes of the conditions of SCW-conversion of asphaltite. It has been discovered that the homologous series of basic aromatic nitrogen-containing compounds containing from two to five aromatic rings are present in all the studied NB extracts from conversion products. The addition of aluminium and zinc promotes the formation of additional amounts of non-substituted structures or the structures containing smaller total number of carbon atoms in alkyl substituents, as well as pentacyclic azabenzopyrenes, dibenzoacridines and tricyclic phenylquinolines. A change in the relative content or appearance of the above-listed NBs in SCW conversion products points to the presence of such nitrogen- and nitrogen-sulphur-containing structural fragments in the resin-asphaltene components of natural asphaltite.
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