Changes in the molecular structure of asphaltenes during cracking of tars in the presence of calcium acetate

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Abstract

The results of investigation of asphaltenes isolated from liquid products of initiated cracking of two tar samples at 500°C in the presence of calcium acetate additive are presented. Characteristic changes in the composition of cracking products depending on the amount of the additive are shown. It is established that the formation of solid products of compaction depends not only on the initial content of asphaltenes, but also on their structure. Changes in the structure-group parameters of asphaltenes in the process of initiated cracking of tar sands have been studied. A distinctive feature of tar cracking in the presence of calcium acetate is that the use of the additive promotes both the destruction of structural blocks and a significant decrease in their number in the composition of asphaltene molecules. In addition, due to the destruction of aliphatic substituents and naphthenic cycles, the averaged asphaltene molecules become more compact and the proportion of condensed aromatic structures in their composition increases significantly.

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About the authors

A. V. Goncharov

FGBUN Institute of Petroleum Chemistry SB RAS

Author for correspondence.
Email: mad111-2011@mail.ru
Russian Federation, 634055 Tomsk

E. B. Krivtsov

FGBUN Institute of Petroleum Chemistry SB RAS

Email: john@ipc.tsc.ru
Russian Federation, 634055 Tomsk

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2. Fig. 1. Scheme of transformations of the average asphaltene molecule of the Omsk Oil Refinery under different conditions: (a) asphaltene molecule of the initial tar; (b) after cracking at 500°C; (c) in the presence of 0.19 wt. % calcium acetate additive; (d) in the presence of 9.75 wt. % calcium acetate additive.

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