ISSN 1070-4272, Russian Journal of Applied Chemistry, 2014, Vol. 87, No. 6, pp. 767−772. © Pleiades Publishing, Ltd., 2014.
Original Russian Text © E.V. Chuparev, P.A. Zernov, O.I. Parputs, N.V. Lisitsyn, 2014, published in Zhurnal Prikladnoi Khimii, 2014, Vol. 87, No. 6, pp. 760−766.
Low Temperature Isomerization of n-Hexane
on Catalyst Systems Al
E. V. Chuparev
, P. A. Zernov
, O. I. Parputs
, and N. V. Lisitsyn
St. Petersburg State Technological Institute (Technical University), Moskovskii pr. 26, St. Petersburg, 190013 Russia
JSC “RRТ Ltd.” ul. Serpukhovskaya 10, St. Petersburg, 190013 Russia
Received May 5, 2014
Abstract— As a result of investigating low temperature isomerization of n-hexane at 130, 140, 150, 160°C in
a ﬂ ow reactor with a ﬁ xed bed of catalyst of the Al
/Pt type a ratio of components in the catalyst
system was selected and process conditions were deﬁ ned, which allow to obtain highly branched high-octane
isomers with a yield of up to 40% relative to a transformed raw material. A kinetic model of the process was
proposed and kinetic parameters were calculated.
There is a need to implement new processes of
production of synthetic gasoline components to meet
contemporary more stringent requirements for fuels .
Isomerization of parafﬁ nic hydrocarbons C
of the cheapest ways to increase the production of high-
octane gasoline components with improved environmen-
Known isomerization processes can be divided
into three types, which are differed mainly by applied
catalysts. Each of these processes has advantages and
The high-temperature process based on the use of
platinum catalysts on zeolite occurs at 250–290°C. This
type of catalyst is less sensitive to sulfur, water, and other
catalyst poisons contained in raw material and hydrogen-
containing gas (HCG) than other types of catalysts. How-
, the product is of a low octane number and requires
circulation of hydrogen.
Medium temperature isomerization based on the use of
platinum catalysts on sulfated zirconium oxide occurs at
120–180°C. The catalyst is characterized by a resistance
to catalyst poisons in a raw material and HCG and by high
yield of branched isomers of pentane and hexane with
a high octane number, but there is a need of hydrogen
Low temperature isomerization process based on
platinum catalysts on chlorided alumina proceeds at
100–160°C. The catalyst does not require hydrogen cir-
culation. It allows to obtain a product with high octane
, however, it is the most sensitive to sulfur, water,
and other catalyst poisons contained a raw material and
HCG, and also requires impregnation by organochlorines
and subsequent puriﬁ cation from them that leads to the
formation of waste water.
, a process using platinum catalysts on sulfat-
ed zirconia is the most promising isomerization process.
The aim of the study was determination of the optimal
ratio of the components in the catalyst of this type, selec-
tion of process conditions, which give highly branched
isomers of hydrocarbons characterized by the highest
octane numbers, and also construction of a kinetic model
of isomerization reaction of hexane on an optimum cata-
Studies of samples of catalysts in the isomerization
reaction of n-hexane were conducted in a ﬂ ow-through
setup (JSC “RRT Ltd.” equipped with isothermal tubular
reactor of a radial type with stationary catalyst bed (Fig. 1).