Isolation and f.i.m.s. analysis of saturated hydrocarbons from tar sand bitumens |
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| Affiliation: | 1. Laboratory of Computational Chemistry and Modelling, Faculty of Natural Science, Quy Nhon University, Quy Nhon, Vietnam;2. LAQV-REQUIMTE and HERCULES, IIFA, University of Évora, Evora, Portugal;3. Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam and Department of Chemistry, KU Leuven, Leuven, Belgium |
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| Abstract: | Saturated hydrocarbons in two Utah tar sand bitumens were determined via compound-type isolation and mass spectral analyses. Four analytical methods for isolating saturated hydrocarbons were evaluated: - 1.1) dewaxing,
- 2.2) modified deasphaltening,
- 3.3) adsorption and complexation chromatography,
- 4.4) desorptive Soxhlet extraction followed by complexation chromatography.
The latter method was preferred for concentrating the greatest amount of saturated hydrocarbons without overlap from aromatic or heteroatom-containing species. Field ionization mass spectrometry (f.i.m.s.) adequately profiled these hydrocarbons by molar mass (m/z) and by Z-series type. The sample of Northwest Asphalt Ridge bitumen was comprised of a wax of mostly acyclic and monocycloalkanes; whereas, the saturates from the sample of Asphalt Ridge bitumen were mostly tetracyclo- and penatcycloalkanes. Based upon a comparison of the saturate distributions in the samples of bitumen, the sample from the Northwest Asphalt Ridge deposit was found to have undergone less biodegradation. This wax-like sample of bitumen may have migrated to the deposit at a later time than the major bitumen generation and/or resulted from physicochemical segregation of waxy organic matter in the reservoir. |
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