resumo
The precipitation and deposition of asphaltenes are complex phenomena that reduce the efficiency in oil production operations. In this study, spectroscopic and thermal methods were used for the characterization of asphaltene samples extracted from deposits belonging to different locations in the Hassi Messaoud field. Structural parameters and the chemical structure of the studied asphaltenes were determined using 13C solid nuclear magnetic resonance (NMR), X-ray diffraction and Raman spectroscopy. The thermal behavior of the asphaltenes studied was examined using differential scanning calorimetry. The results obtained suggest that island is the predominent architecture for the asphaltenes studied with an average of 7 to 8 fused rings and aliphatic length chain of about 3-4 carbons. The number of aromatic sheets in a stacked cluster (N) is between 7 and 8 sheets. The aromatic sheet diameter of the four samples ranges from 12.18 to 15.52 angstrom with an average interlayer distance between aromatic sheets of 3.52 angstrom and an average interchain layer distance of 4.48 angstrom.
palavras-chave
NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE NMR; MASS-SPECTRAL ANALYSIS; X-RAY-DIFFRACTION; PETROLEUM ASPHALTENES; RAMAN-SPECTROSCOPY; GLASS-TRANSITION; CRUDE OILS; H-1; PRESSURE
categoria
Energy & Fuels; Engineering
autores
Behnous, D; Bouhadda, Y; Moffatt, B; Zeraibi, N; Coutinho, JAP
nossos autores
Projectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was developed within the scope of the project CICECO- Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC) . The NMR spectrometers are part of the National NMR Network (PTNMR) and are partially supported by Infrastructure Project N ? 022161 (co-financed by FEDER through COMPETE 2020, POCI and PORL and FCT through PIDDAC) .