Molecular characterization of polar heteroatom species in oilsands bitumen-derived vacuum residue fractions by Fourier transform ion cyclotron resonance mass spectrometry

Abstract

A Canadian in situ oilsands bitumen-derived vacuum residue (VR) was subjected to supercritical fluid extraction and fractionation (SFEF) into 13 extractable fractions and an unextractable end-cut and characterized by positive-and negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). The results of negative-ion ESI FT-ICR MS showed that the N 1 class species was the most abundant and the multifunctional group compounds, such as class species became abundant as the SFEF fraction became heavier. In positive-ion ESI mode, the relative abundance of N 1 class species decreased gradually in the heavy SFEF fractions while that of multifunctional group compounds increased. The relative abundance of N 4 V 1 O 1 increased dramatically in heavy fractions and the end-cut. The distributions of polar heteroatom species of VR derived from oilsands bitumen were similar with those of VR derived from the Venezuela Orinoco extra heavy oil.

Fractionation and Characterization of Petroleum Asphaltene: Focus on Metalopetroleomics

“…SFEF was usually devoted to separating heavy oils, residues, and oil sands. Afterwards, various aspects of narrow SFEF subfractions were investigated, such as hindered diffusion, solubility parameters, information on alkyl side chains, average structure, and molecular composition [131].…”

Molecular Characterization of Fossil and Alternative Fuels Using Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry: Recent Advances and Perspectives

“…This indicates that the molecules in various SFEF subfractions are separated by both their aromaticity and molecular weight. The characterization was carried out for a Canadian oilsands bitumen-derived VR, and similar results were obtained . Zhang et al using (+) and (−)­ESI characterized the SFEF fractions and their S-methylation products of the Venezuelan VR and compared them with (+)­APPI analysis.…”

“…To make a deep characterization of the heavy resides, a supercritical fluid extraction and fractionation (SFEF) method has been established in the State Key Laboratory of Heavy Processing, China . Heavy distillation resides can be fractionated into a dozen of fractions without molecular destruction by using solvents such as propane, butane, and pentane . Zhang et al analyzed the 13 SFEF extracts and an unextractable end-cut from a Venezuelan heavy oil by (−)­ESI FT-ICR MS.…”

“…83 Heavy distillation resides can be fractionated into a dozen of fractions without molecular destruction by using solvents such as propane, butane, and pentane. 228 Zhang et al 229 analyzed the 13 SFEF extracts and an unextractable end-cut from a Venezuelan heavy oil by (−)ESI FT-ICR MS. The mass range and maximum peak of the SFEF fraction increased as the fraction became heavier.…”

Characterization of Vanadium and Sulfur Containing Compounds of Kazakhstan Petroleum Vacuum Residuum

“…Methods for the separation of mixtures based on the application of new principles have been developed [4,5], which makes it possible to quickly obtain quantitative data on the composition of petroleum fractions [6]. The most important chemical types and structural features of many heteroatoms have been characterized [7], as well as some patterns of individual classes of these compounds [8]. However, despite all this, further in-depth studies of the composition and structure of petroleum heteroatoms are needed, as they study the researchers face almost insurmountable difficulties due to the complexity and variability of the oil composition, the extraordinary molecular diversity of hetero-organic compounds, and the lack of effective, accessible analytical methods.…”