Collect. Czech. Chem. Commun. 1979, 44, 1160-1166

Characterization of heavy crude oil fractions by means of the 13C NMR technique

Milan Hájeka, Gustav Šeborb, Ivo Langc, Zenon Starčukd, Otto Weisserb and Luděk Vodičkaa

a Laboratory of Synthetic Fuels
b Department of Petroleum Technology and Petrochemistry, Prague Institute of Chemical Technology, 166 28 Prague 6
c Mining Institute, Czechoslovak Academy of Sciences, 180 42 Prague 8
d Institute of Scientific Instruments, Czechoslovak Academy of Sciences, Brno


The 13C NMR spectra of samples of heavy crude oil fractions were interpreted. The spectra of all samples were of the same character. In the region of the aliphatic carbon shifts, ten different carbon atom types were discerned; some possible structure types of hydrocarbons were attributed to them and the arrangement of the aromatic rings in a mean molecule of the samples examined was discussed.