By Jorge Ancheyta
Designed for scientists operating for petroleum and catalyst businesses, this article re-examines the characterization and conversion of asphaltenes.
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Extra resources for Asphaltenes : chemical transformation during hydroprocessing of heavy oils
Hirschberg et al. 37 MPa. Hammami et al. (2000) carried out experiments at a pressure and temperature typical of a field production system indicating that precipitation is a reversible process by alternating depressurization and repressurization steps. Repressurization experiments showed, at least partially, the reversibility of asphaltene precipitation. 7 MPa and room temperature observing that asphaltene precipitation is reversible. Pina et al. (2006) conducted studies of decompression and recompression in crude and found variation in the content of asphaltenes dissolved in a sample as function of pressure.
1993). Schmitter et al. (1984) and Dorbon et al. (1984) have identified carbazole, methyl, dimethyl, and benzocarbazoles by means of gas chromatography. 17 Asphaltenes in n-heptane against heteroatoms content in different crude oils: (Δ) Ni+V in wppm × 102; () N in wt% × 10−1; () S in wt%. , 2002. Energy Fuels 16 (5): 1121–1127. indb 22 11/20/09 12:51:35 PM Definition and Structure of Asphaltenes 23 catalytic hydrotreating, it was found that benzocarbazoles are easier to remove than carbazoles in the presence of high hydrogen pressure at 10 MPa and at 360°C, whereas 1-methyl carbazol is removed at higher temperatures, such as 380°C and 5 MPa of hydrogen pressure.
Peramanu et al. (1999) have separated the Athabasca and Cold Lake bitumens into saturates, aromatics, resins, and asphaltenes, and obtained molecular weights of each fraction by VPO. 24 in which the content of each fraction and its molecular weight are observed. It can be seen that asphaltene is the smallest fraction in weight but it has the highest molecular weight. The higher the complexity of the fraction, the higher the molecular weight. Saturates and aromatics have almost the same molecular weight.