Other
Scientific paper
Sep 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1043h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 9, pp.1043-1059
Other
Scientific paper
Forty one gas condensates from Alberta, Canada, from stratigraphie units ranging in age from U. Cretaceous to M. Devonian were gas chromatographically analysed for low molecular weight aromatic hydrocarbons. Aromatic hydrocarbons range from 0.5 to 45.6 per cent with benzene, toluene and the xylenes averaging 80 per cent of the aromatic content. Trimethylbenzenes (of which 1,2,4-trimethylbenzene is the most important), ethylbenzene, and naphthalene comprise the major portion of the remainder. Other alkyl substituted benzenes and naphthalenes are relatively insignificant. Factor analysis demonstrated relations amount the low molecular weight aromatic hydrocarbons, n -paraffins and sulphur. These relations are interpreted in terms of the derivation of toluene and xylenes from precursors such as the carotenes, with subsequent temperaturecontrolled disproportionation of both toluene and xylenes to yield benzene and trimethylbenzenes. Although the relative positions of benzene, toluene, xylenes and trimethylbenzenes on one hyperplane are in the same relative proportions as their free energies of formation, they are not in thermodynamic equilibrium. These positions may be interpreted also as proportional to their solubilities. Study of the distribution of the xylene and trimethylbenzene isomers suggests the dominance of specific precursors. Ethylbenzene abundance is independent of the abundance of other low molecular weight aromatic hydrocarbons, and probably arises from phenylalanine or tyrosine by decarboxylation, deamination, and conversion of vinylbenzene to ethylbenzene. Naphthalene may have a source distinct from that of benzene and the methylsubstituted benzenes.
Gawlak Mietka
Hitchon Brian
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