Estimation of average structural parameters of bitumens by 13C nuclear magnetic resonance spectroscopy

Abstract The determination of the average molecular parameters of bitumens represents an important step in describing the skeletons of asphalt cements. A new investigation method is presented, based only on the analysis of 13 C nuclear magnetic resonance (n.m.r.) data and molecular weights. This method is proved to be an efficient procedure to give independent parameters and to try to define a ‘fingerprint’ of the bitumens. In particular, the aromatic part of these complex mixtures is described by comparison with an exhaustive list of possible models.

[1]  P. Rubini,et al.  Quantitative carbon-13 and proton nuclear magnetic resonance spectroscopy of crude oil and petroleum products. I. Some rules for obtaining a set of reliable structural parameters , 1981 .

[2]  P. Rubini,et al.  Structural analysis by NMR and FIMS of the tar-sand bitumen of Bemolanga (Malagasy) , 1994 .

[3]  D. Grant,et al.  Carbon-13 solid-state NMR of Argonne-premium coals , 1989 .

[4]  Tadashi Yoshida,et al.  Derivation of structural parameters for coal-derived oil by carbon-13 nuclear magnetic resonance spectrometry , 1980 .

[5]  D. T. Pegg,et al.  Complete accurate editing of decoupled 13C spectra using DEPT and a quaternary-only sequence , 1983 .

[6]  P. Rubini,et al.  Quantitative carbon-13 and proton nuclear magnetic resonance spectroscopy of crude oil and petroleum products. 2. Average structure parameters of representative samples , 1981 .

[7]  J. Newman,et al.  Petroleum-derived carbons , 1986 .

[8]  E. Dickinson.  Structural comparison of petroleum fractions using proton and 13C n.m.r. spectroscopy , 1980 .

[9]  S. DeCanio,et al.  Molecular representations of Ratawi and Alaska north slope asphaltenes based on liquid- and solid-state NMR : Resid upgrading , 1994 .

[10]  Pradeep Kumar,et al.  Estimation of average structural parameters of petroleum crudes and coal-derived liquids by 13C and 1H n.m.r. , 1986 .

[11]  M. Bendall,et al.  Application of the DEPT pulse sequence for the generation of 13CHn subspectra of coal-derived oils , 1984 .