1070-4272/01/7405-0885$25.00C2001 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 74, No. 5, 2001, pp. 885!889. Translated from Zhurnal Prikladnoi Khimii, Vol. 74, No. 5,
2001, pp. 858!862.
Original Russian Text Copyright + 2001 by Platonov, Proskuryakov, Rozental’, Ryl’tsova, Popova, Polovetskaya.
OF FOSSIL FUEL
Pyrolysis of Asphaltenes of G6 Coal Semicoking Tar
V. V. Platonov, V. A. Proskuryakov, D. A. Rozental’, S. V. Ryl’tsova,
Yu. N. Popova, and O. S. Polovetskaya
Lev Tolstoi State Pedagogical University, Tula, Russia
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received December 21, 2000
Abstract-Homogeneous pyrolysis of asphaltenes of G6 coal semicoking tar at 7503900oC was studied.
Optimization of destructive hydrogenation, high-
rate pyrolysis, and high-temperature coking requires
primarily detailed information on the chemical com-
position of the organic matter of coals (OMC), frac-
tional, group, and structural-group compositions of
the liquid products of [mild] thermal degradation of
OMC, and directions and types of high-temperature
transformations of [primary] products. Such data can
be obtained by studying various coal extracts and sep-
arate groups of compounds of semicoking tars under
conditions minimizing high-temperature transforma-
tions of primary products, which in this case can be
considered with confidence as corresponding to native
fragments of the coal macromolecule, and also by
revealing the features of high-temperature pyrolysis
of these products.
In this work we studied the high-temperature pyrol-
ysis of asphaltenes of the semicoking tar of G6 coal
(Kuznetsk Coal Fields).
The content of asphaltenes in the coal semicoking
tar reaches 30 wt %; therefore, their contribution to
formation of high-temperature liquid products and
coke structure will be significant.
The combination of elemental, quantitative func-
tional, structural-group, and emission spectrum anal-
yses, cryoscopy, IR, UV, and
H NMR spectroscopy,
and adsorption liquid, capillary gas3liquid, and pre-
parative thin-layer chromatography showed that the
asphaltenes of G6 coal semicoking tar are a complex
mixture of high-molecular-weight polycyclic com-
pounds of the alicyclic, hydroaromatic, aromatic, and
heterocyclic nature, substituted with various function-
al groups and alkyl chains .
Pyrolysis of asphaltenes was performed in a setup
consisting of a quartz pyrolyzer (d = 20 mm, l =
500 mm), a three-sectional oven, and systems for
feeding the initial substance and condensing and trap-
ping the pyrolysis products . The vapor3emulsion
mixture of asphaltenes fed to the pyrolyzer was di-
luted with argon in a ratio (1 : 25 by volume) close to
that of dilution of resin vapor with coke oven gas in
the course of high-temperature coking. Also, dilution
with argon allowed accurate measurement and fine
control of the residence time of the vapor in the pyrol-
To determine the contribution of asphaltenes to
formation of other classes of compounds, we per-
formed the chemical group analysis of the tars 
followed by study of the qualitative and quantitative
composition of separate groups of components by
elemental, functional, and structural-group analyses,
cryoscopy, capillary gas3liquid chromatography, and
IR and UV spectroscopy.
Pyrolysis of coal asphaltenes was performed at
750, 800, and 900oC; the residence time of the vapor
in the heated zone was 0.5, 1.5, 3.0, and 6.0 s.
The material balance data for asphaltene pyrolysis
and the results of chemical group analysis of the
liquid products are listed in Table 1.
It is seen that asphaltenes of G6 coal semicoking
tar undergo extensive transformations whose extent is
determined by temperature and residence time of the
asphaltene vapor in the pyrolyzer.
Within the first 0.5 s at 750, 800, and 900oC the
yield of pyrocarbon (a highly condensed product of
the carbon black type) was 11.2, 13.4, and 16.5 wt %,
the yield of liquid products, 81.3, 70.1, and 61.3 wt %,
and the yield of gaseous products, 7.5, 16.5, and
22.2 wt %, respectively. The rate of asphaltene degra-
dation in the next second at 750oC is somewhat lower,
as suggested by small changes in the yields of pyro-