High temperature transformation of tar-asphaltene components of oil sand bitumen

Abstract

Transformations of high-molecular-weight compounds of oil sand natural bitumen under the heat treatment were studied in this work. For that purpose the natural bitumen isolated from oil sand taken from the Beke field (Kazakhstan) was used as a substrate. Thermal processing of natural bitumen leads to a general change in the chemical composition of components and to an increase in the output of certain fractions. The contents of oil, tar and asphaltenes were determined and the elemental composition of tar-asphaltene compounds was evaluated. Molecular structures of the tar and asphaltene components of natural bitumen before and after cracking have been defined from the data of elemental analysis, NMR spectroscopy and molecular weight. The high molecular compounds were presented as giant molecules containing small aromatic islands some of which were linked by aliphatic chains, that was proved by infrared spectroscopy.

Intensified Transformation of Low-Value Residual Fuel Oil to Light Fuels with TPABr:EG as Deep Eutectic Solvent with Dual Functionality at Moderate Temperatures

“…The data are graphically displayed in Figure along with images from dried samples. Possible assignments of various vibration frequencies are listed in Table . ,− We can gain some useful information on the framework of the remaining asphaltenes and pursue the events that happened during upgrading by interpreting the IR bands accurately.…”

Thermogravimetric Study of Cracking Products of Natural Bitumens

“…After our previous studies [13] were an attempt to build the molecular structure of resin-asphaltene components of natural bitumen. These analyses allow to present approximate direction of reaction at high temperature.…”

Нефтяные Асфальтены Как Наноразмерные Объекты Исследования

“…В работах [34,35] на основе данных ИК-, ПМР-спектроскопического, элементного, структурно-группового анализа методом Монте-Карло построены гипотетические усредненные структуры смол и асфальтенов природных битумов месторождения Беке до и после крекинга. Установлено, что в результате крекинга в структуре асфальтенов происходит разрушение алифатических и полинафтеновых структур, возрастает ароматичность, уменьшается количество кислородсодержащих структур.…”