Catagenesis and composition of petroleum: Origin of n -alkanes and isoalkanes in petroleum crudes

Details Catagenesis and composition of petroleum: Origin of n -alkanes and isoalkanes in petroleum crudes Catagenesis and composition of petroleum: Origin of n -alkanes and isoalkanes in petroleum crudes

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2445k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 9, pp.2445-2457

Computer Science

5

Scientific paper

Distribution of n -alkanes and isoalkanes in ca . 50 petroleum crudes have been examined by the gas chromatography. Molar distributions of n -alkanes with respect to their c atom numbers in the majority of crudes follow the exponential law, which signifies a random, chemical nature of n -alkane-generating processes occurring in the catagenesis stage of petroleum maturation. Similar distributions of n -alkanes were found in the products of mild thermolysis of heavy n -alkanes. Isoalkanes represent a major, 10-25%, petroleum component. The principal types of isoalkanes in crudes are monomethyl-branched, with the branches randomly positioned in the chains, and dimethyl-branched with one of the methyl groups predominantly in the second position in the chains. Thermolysis studies of individual n -alkanes, alkanoic acids, and esters in the presence of various minerals provided an explanation of the n -alkane and isoalkane distributions. Selected heavy n -alkanes are initially formed in decarboxylation reactions of heavy n -alkanoic acids and esters. Extensive thermocracking produces mixtures of lighter n -alkane and -olefins. The olefins, in the presence of acidic clays, are converted in cationic reactions into mixtures of predominantly mono- and dimethyl-branched isoalkanes.

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