1070-4272/05/7802-0239 + 2005 Pleiades Publishing, Inc.
Russian Journal of Applied Chemistry, Vol. 78, No. 2, 2005, pp. 239!242. Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 2, 2005,
Original Russian Text Copyright + 2005 by Bondaletov, Troyan, Chernov, Bannikova, Dmitrieva.
AND ION-EXCHANGE PROCESSES
Adsorption of Gaseous Hydrocarbons on the Surface
of Modified Petroleum-Polymeric Resins
V. G. Bondaletov, A. A. Troyan, E. B. Chernov,
E. V. Bannikova, and Z. T. Dmitrieva
Institute of Petroleum Chemistry, Siberian Division, Russian Academy of Sciences, Tomsk, Russia,
Polytechnic University, Tomsk, Russia
Received July 23, 2004
Abstract-The kinetics of adsorption of model hydrocarbons (benzene, toluene, ethyl benzene, isopropyl
benzene, cyclohexane) from the gas phase on the surface of ozonized and maleized petroleum-polymeric
resins was studied. The dependences of the dynamic equilibrium capacity of the petroleum-polymeric resins
and of the adsorption kinetic parameters on the composition of the adsorbent3adsorbate system were
Physical adsorption is low-selective process gov-
erned by the ratio of the translation kinetic energy of
sorbate molecules to the surface energy of the adsor-
bent. This predetermines the ways of improving the
adsorption-structural parameters of the adsorbent. Along
with the sorption power of porous materials, the selec-
tivity of the adsorbent is also of importance. In this
study, we examined modified (ozonized and maleized)
petroleum-polymeric resins (PPR) as new adsorbents
for adsorption of hydrocarbons from the gas phase.
To prepare adsorbents based on modified PPR,
the piperylene-amylene (C5), styrene-indene (SIF), and
dicyclopentadiene (DCPDF) fractions of the liquid
products of pyrolysis of straight-run naphtha were
subjected to catalytic polymerization at 80oC for 3 h
in the presence of the Ziegler3Natta catalytic system
based on TiCl
Al system at a 1 : 0.33 com-
ponent molar ratio and TiCl
concentration of 2 wt %
. Crystalline, insoluble in hydrocarbons, PPRs
) were prepared by
ozonation of a 10% PPR solution in xylene with an air3
ozone mixture (O
flow rate 38.5 l h
tration 2 vol %) in a bubbler at 5oC for 3 h . The
maleization was performed by the PPR reaction with
10 and 20 wt % maleic anhydride in the melt at 180oC
for 4 h. The subsequent ozonation of maleized PPR
gave modified PPRs (OPPR
The samples of modified PPRs were ground into
powders, and the 2003250-mm fraction was separated.
Before experiment, the adsorbent samples were vac-
uum-treated for 538hat50360oC and 0.133 Pa.
The true and bulk densities of the adsorbent were
found densimetrically .
Chemically and analytically pure benzene, toluene,
ethyl benzene, isopropyl benzene, and cyclohexane
were additionally distilled and stored in hermetically
sealed vessels over freshly calcined NaA zeolite.
Adsorption of the model hydrocarbons from an
air3gas mixture was performed at 20oC on a device
equipped with a compressor, Drechsel bottle charged
with the adsorbate, and a filter with the adsorbent.
The adsorbent (235 g) was loaded into the filter as
a continuous bed. An air3gas flow generated by the
compressor was filtered through the adsorbent layer
at the initial pressure of (233) 0 10
Pa. The rate of
hydrocarbon feeding with the air3gas flow was 53
. The weight of the adsorbed hydrocarbon
was determined gravimetrically at 15320 min intervals
until the equilibrium was attained.
The process duration for each adsorbent3adsorbate
system studied and the total weight of the adsorbed
hydrocarbons at equilibrium were determined from
the kinetic dependences of the hydrocarbon adsorption
(Figs. 1a, 1b). From the total increase in the weight,