1070-4272/01/7411-1950$25.00C2001 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 74, No. 11, 2001, pp. 1950!1954. Translated from Zhurnal Prikladnoi Khimii, Vol. 74, No. 11,
2001, pp. 1888!1892.
Original Russian Text Copyright + 2001 by Begak, Syroezhko.
OF FOSSIL FUEL
Molecular Oxygen and Oxygen- and Nitrogen-Containing
Compounds in Diesel Fractions of West-Siberian Oil
O. Yu. Begak and A. M. Syroezhko
Mendeleev Russian Research Institute of Metrology, State Unitary Enterprise, St. Petersburg, Russia
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received July 30, 2001
Abstract-Heteroatomic compounds in middle-cut (2003360oC) distillates of West-Siberian oil were identi-
fied by gas chromatography3mass spectrometry.
The composition of diesel frtactions boiling in the
range from 1603200 to 360oC is complex, and the
existing analytical procedures do not allow complete
identification of the components, especially of hetero-
organic (N-, S-, and O-containing) compounds. The
most studied components of diesel fractions are al-
kanes, isoalkanes, isoprenoids, and naphthene and
aromatic hydrocarbons .
In this work we showed that in fractions boiling at
higher temperatures than benzine the content of meth-
ane hydrocarbons (oils of grades A and B) decreases,
the content of branched hydrocarbons increases, and
isoprenoids appear in significant amounts. As for
naphthenic hydrocarbons, their structure becomes
more complex in going from benzine to diesel frac-
tions; in particular, the number of rings in the mole-
cule increases to 233.
Aromatic hydrocarbons of the diesel fraction con-
sist of homologs of benzene, naphthalene, and, in part,
phenanthrene and anthracene. Also, hybrid compounds
are present, containing, along with one or two aromat-
ic rings, also one or several naphthene rings. Primarily
these are indane and tetralin derivatives. In going
from the benzine to diesel fractions, the number and
length of alkyl substituents in aromatic compounds
increase, as well as the number of rings in the mole-
cule; in particular, tricyclic condensed aromatic hydro-
carbons (phenanthrene derivatives) appear.
Heteroorganic compounds of the diesel fraction are
oxygen-, sulfur-, and nitrogen-containing derivatives
of the above-mentioned hydrocarbons.
The oxygen-containing compounds are mainly
mono- and dibasic petroleum acids and phenols (di-
methyl-, trimethyl-, and methylethylphenols) .
Sulfur-containing compounds of the diesel fraction
are sulfides (thiacyclanes) and thiophene derivatives.
The content of thiols and disulfides in the diesel frac-
tions is low.
Nitrogen-containing compounds of the diesel frac-
tion are mainly derivatives of pyridine, quinoline, and,
to a lesser extent, aniline. Very small amounts of
porphyrins can be present. On the whole, it is desira-
ble to obtain more detailed information on the compo-
sition of oxygen- and nitrogen-containing compounds
of the diesel fraction in various stages of commercial
refining of a mixture of West-Siberian crude oils
at the Kirishinefteorgsintez Production Association,
Limited Liability Company.
Molecular oxygen dissolved in diesel fractions
(sample nos. 135
) was determined chromatographi-
Hydroperoxide in diesel fractions were determined
Heteroorganic compounds were concentrated with a
Diapak silica gel cartridge (BiokhimMak, Moscow).
Diesel fractions (five samples) were taken March 28, 2001,
from L-24/6 and L-24/2000 installations of the Kirishinefte-
orgsintez Production Association. Sample nos. 133 were sup-
plied from the Parex installation (2003300oC fraction) to the
L-24/6 installation and were taken from the 225 reservoir in
the feed pumping line (sample no. 1), at the outlet of the
TsN-2 feed pump (sample no. 2), and at the outlet of the
TsN-4 feed pump (sample no. 3). Sample nos. 4 and 5 (2003
360oC fraction) were taken from the L-24/2000 installation
at the inlet of the N-201 feed pump (sample no. 4) and at the
line of pumping into reservoir 261 (sample no. 5).