Naslov
NMR, CHEMOMETRIC AND GCxGC STUDIES OF CRUDE OILS, VACUUM RESIDUES AND VACUUM GAS OIL

Autori
Parlov Vuković, Jelena ; Hrenar, Tomica ; Plavec, Janez ; Friedrich, Miha ; Štajduhar, Luka ; Telen, Sanda ; Marinić Pajc, Ljiljana ; Novak, Predrag

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Skup
SMASH 2015

Mjesto i datum
Baveno, Italija, 20.09.2015. - 23.09.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
crude oil, NMR, statistical methods

Sažetak
NMR spectroscopy in combination with statistical methods was used to study vacuum residues and vacuum gas oils from 32 crude oils of different origin. Two chemometric metodes were applied. Firstly, principal component analysis on complete spectra was used to perform classification of samples and clear distinction between vacuum residues and vacuum light and heavy gas oils were obtained. To quantitatively predict the composition of asphaltenes, principal component regression models using areas of resonance signals spaned by 11 frequency bins of the 1 H NMR spectra were build. A comprehensive two dimensional gas chromatography (GCxGC) was applied to identify different classes of hydrocarbons present in a selected crude oil. Pseudo two-dimensional DOSY NMR experiments were then used to assess the composition and structural properties of asphaltenes in a selected crude oil and its vacuum residue on the basis of their different hydrodynamic behavior and translational diffusion coefficients. DOSY spectra showed the presence of several asphaltene aggregates differing in size and interactions they formed. It has been shown that NMR spectroscopy coupled with statistical methods and GCxGC is a valuable tool for the investigation of crude oil and asphaltene samples

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

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