The
LUKOIL Neftohim Burgas vacuum residue hydrocracking has increased
the vacuum residue conversion from 55 to 93% as a result of a proper
feed selection, optimal catalyst condition, and the use of a Mo nanodispersed
catalyst. It was found that the feed colloidal instability index estimated
from the feed saturates, aromatics, resins, and asphaltenes (SARA)
data negatively correlated with the conversion. Correlations based
on the use of the nonlinear least-squares method, which relates the
density to the aromatic structure contents for the straight run and
hydrocracked vacuum residues, were developed. Intercriteria analysis
was applied to evaluate the relations between the different properties
of the straight run and the hydrocracked vacuum residual oils. The
density of the hydrocracked vacuum residue measured by dilution with
toluene was found to strongly correlate with the conversion, Conradson
carbon content, softening point, and Fraasss breaking point.
Ten gas oils and one deasphalted hydrocracked vacuum residue obtained from ebullated‐bed vacuum residue hydrocracking have been cracked in a laboratory advanced catalyst evaluation unit on a commercial fluid catalytic cracking (FCC) catalyst. It was found that the eleven secondary heavy oils obey second‐order reaction kinetics. The relations between gas oil properties and FCC conversion, product yields, and quality were evaluated by means of intercriteria analysis. It could be stated that the FCC conversion strongly correlates with the gas oil Kw characterization factor. The product yields were established to depend on the secondary gas oil carbon atoms number, aromatic ring index, paraffinic and aromatic carbon content, and the total aromatics content.
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