Composition of Structural Fragments Bound through Ether and Sulphide Bridges in the Molecules of Tarry Substances of Natural Bitumen from the Ashalcha Deposit (Tatarstan)
T. V. CHESHKOVA, T. A. SAGACHENKO, R. S. MIN
Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademicheskiy, 4, Tomsk 634055 (Russia)
Keywords: natural bitumen, tar, sulphide and ether bonds, destruction, saturated and aromatic hydrocarbons, heteroatomic compounds
Abstract
It is demonstrated that the structure of tar of the natural bitumen from the Ashalcha deposit (Tatarstan). The composition of these fragments was studied using chemical destruction, liquid adsorption chromatography and gas chromatography-mass spectrometry. It was established that the ether and sulphide bridges in the molecules of tar in bitumen from the Ashalcha deposit bind bind normal and branched alkanes, alkyl cyclopentanes and alkyl cyclohexanes, phenyl alkanes with different positions of phenyl substituent, mono-, di-, tri- and tetraalkyl benzenes, alkyl substituted naphthalenes and phenanthrenes, benzo- and dibenzothiophenes, aliphatic acids and esters, cyclic alcohols and bicyclic terpenoid sulphides. Binding between saturated and aromatic hydrocarbons, dibenzothiophenes, sulphides and aliphatic acids is realized through ether and sulphide bridges. Aliphatic ethers are bound only by sulphide bridges, while cyclic alcohols are bound only by ether bridges. Among the identified compounds, predominant are saturated hydrocarbons, mainly normal alkanes. The presence of С20 and higher hydrocarbons is the evidence that long aliphatic chains are present in the structure of tarry substances in Achalcha bitumen. Among aromatic hydrocarbons, dominating are n- alkylbenzenes, naphthalenes and phenanthrenes, while among heteroatomic compounds alkyldibenzothiophenes are prevailing.
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