POLYCYCLOALCANE HYDROCARBONS IN TARIBANI OIL

Natela Khetsuriani; Elza Topuria; Madlena Chkhaidze; Vladimer Tsitsishvili

doi:10.31435/rsglobal_ws/30092018/6132

Natela Khetsuriani doctor, Head of the Petroleum Chemistry laboratory, Chief Research Workers; Georgia, Tbilisi, TSU, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry,
Elza Topuria PhD, Chief research workers
Madlena Chkhaidze MS, Scientific workers; Georgia, Tbilisi, TSU, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry,
Vladimer Tsitsishvili Academy Members, Professor, Georgia, Tbilisi, TSU, Petre Melikishvili Institute of Physical and Organic Chemistry, Laboratory of Petroleum Chemistry

DOI: https://doi.org/10.31435/rsglobal_ws/30092018/6132

Keywords: oil, polycyclic hydrocarbons, thermal diffusion separation, thiourea adduction

Abstract

For the purpose of extraction and identification of cyclic alkane hydrocarbons in oil from the Taribani field, Georgia, concentrates isolated from 200-350oC fractions have been studied. The concentrate preparation included the following steps: (a) distillation of a crude oil, (b) dearomatization of distillates by silica gel, (c) three-stage thermal diffusion separation of isoalkanes and cycloalkanes, and (d) thiourea adduction. Ten thermal diffusion fractions were obtained. A mixture of the IX and X fractions and separately the VIII fraction were studied. The extracts from these fractions with thiourea were studied as well. Composition of concentrates has been determined by the gas chromatography – mass spectrometry (GC-MS) method.
The main components of the VIII thermodiffusion fraction were C11- C22 isoprenoid alkanes. Among them the predominant were pristane C19 and the phytane C20, the well-known biomarkers of oil. In the VIII thermodiffusion faction including dimethyl-, trimethyl-, tetramethyl-, ethyl-, methyl-ethyl-, diethyl-, propyl, methyl-propyl adamantanes, were identified.

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