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- W2000401250 abstract "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 α-olefins. The olefins, in the presence of acidic clays, are converted in cationic reactions into mixtures of predominantly mono- and dimethyl-branched isoalkanes." @default.
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- W2000401250 date "1987-09-01" @default.
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- W2000401250 title "Catagenesis and composition of petroleum: Origin of n-alkanes and isoalkanes in petroleum crudes" @default.
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- W2000401250 doi "https://doi.org/10.1016/0016-7037(87)90296-1" @default.
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