ISSN 1070-4272, Russian Journal of Applied Chemistry, 2015, Vol. 88, No. 4, pp. 609−616. © Pleiades Publishing, Ltd., 2015.
Original Russian Text © N.M. Maximov, P.S. Solmanov, V.S. Tsvetkov, Yu.V. Eremina, E.O. Zhilkina, N.N. Tomina, A.A. Pimerzin, 2015, published in Zhurnal
Prikladnoi Khimii, 2015, Vol. 88, No. 4, pp. 577−584.
Analysis of the popularity of thermal and
thermocatalytic methods in processing of oil residues 
shows that the delayed coking process is a key technology
for processing of residual raw materials, employed
at modern oil reﬁ neries. More than 40% of heavy oil
residues is processed in the world by this technique.
The wide use of the delayed coking [2–4] is due to its
high economical efﬁ ciency. The delayed coking process
can serve to obtain coke and to raise the oil conversion
depth (yield of light distillates). The maximum output
of distillates for obtaining motor fuels widely occurs in
modern delayed coking technologies . However, the
poor quality of distillates produced in delayed coking
makes problematic its efﬁ cient use, especially in view
of the existing stringent ecological regulations for
commercial oil products.
Analysis of published data shows that the most
widespread is the combination of delayed coking,
catalytic cracking, and hydrotreating or hydrocracking.
This combination of processes makes it possible to obtain
light oil products satisfying in quality the requirements
of regulatory documents. In view of the nearly complete
absence of hydrocracking installations at Russia’s oil
reﬁ neries , it becomes apparent that hydrotreating is
the central process in schemes for processing of coking
At present, the hydrotreating is used at Russia’s oil
reﬁ neries to process mixtures of delayed coking benzine
or light delayed coking gasoil with a straight-run diesel
fraction (SDF) . With vacuum gasoil and heavy coking
gasoil used as raw materials for hydrotreating, the oil
conversion depth and the yield of light oil products will
be raised. However, the hydrotreating of mixtures of
vacuum gasoil with heavy coking gasoil is not performed
and has not been studied.
The goal of our study was to examine the mutual
inﬂ uence of oleﬁ n and polycyclic aromatic hydrocar-
bons (PAHs) in relation to the fractional composition of
mixtures of distillates in joint hydrotreating of vacuum
gasoil in a mixture with benzine (up to 50%), light coking
gasoil (up to 40%), and heavy coking gasoil (up to 25%).
The characteristics of vacuum gasoil (VG), delayed
coking benzine (DCB), light coking gasoil (LCG), and
Hydrotreating of Vacuum Gasoil in Mixture with Delayed Coking
Products on Industrial NiMo/Al
N. M. Maximov, P. S. Solmanov, V. S. Tsvetkov, Yu. V. Eremina, E. O. Zhilkina,
N. N. Tomina, and A. A. Pimerzin
Samara State Technical University, ul. Molodogvardeiskaya 244, Samara, 443100 Russia
Received April 4, 2015
Abstract—To examine the inﬂ uence exerted on the degree of hydrogenation and hydrogenolysis by the content
of oleﬁ n (dioleﬁ n) and polycyclic aromatic hydrocarbons at different fractional compositions of distillate mix-
tures, joint hydrotreating of vacuum gasoil with benzine and light and heavy coking gasoils was performed. The
study was carried out in a laboratory installation under a hydrogen pressure of 5.0 MPa, temperature of 375°C,
volumetric ﬂ ow rate of raw materials of 1 h
, and H
/raw material ratio of 1000/1. The effect of the composi-
tion of raw materials and process conditions on the chemical composition and quality parameters of the resulting
products was demonstrated. It was shown that a pronounced competition between oleﬁ n and polycyclic aromatic
hydrocarbons in hydrogenation reactions is observed for mixtures of heavy vacuum gasoil and light coking gasoil,
in contrast to mixtures of straight-run diesel fraction and light coking gasoil.