Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 12, pp. 2167−2185.
Pleiades Publishing, Ltd., 2011.
Original Russian Text
A.M. Aliev, A.Z. Tairov, A.M. Guseinova, A.I. Babaev, N.R. Ismailov, 2011, published in Khimicheskaya Promyshlennost’, 2011,
Vol. 88, No. 4, pp. 163−183.
PROCESSES AND DEVICES
OF CHEMICAL MANUFACTURES
Mathematical Simulation in Enhancing of Industrial Pyrolysis
of Hydrocarbon Gases and Their Mixtures with Feedback
A. M. Aliev
, A. Z. Tairov
, A. M. Guseinova
, A. I. Babaev
, and N. R. Ismailov
Institute of Chemical Problems, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
Institute of Petrochemical Processes, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
“Ethylene–Polyethylene” Plant of Group “Azerihimiya,” Sumgait, Azerbaijan
Received July 2, 2011
Abstract—A general technique was developed for optimal designing pyrolysis with feedback of hydrocarbons
and their mixtures. Based on this technique, we carried out a study of industrial processes of pyrolysis of
propane, ethane, and ethane with the butane–butylene fraction, developed their complete mathematical models that
reﬂ ected the peculiarities of recycling, and on the basis thereof we deﬁ ned optimal regimes of governing by these
processes that differed signiﬁ cantly from those used in industry. We suggested new ways of governing by all three
processes. The use of these ways will allow getting a signiﬁ cant proﬁ t by “Ethylene–Polyethylene” plant (Sumgayit).
We demonstrated advantages of carrying out pyrolysis of various raw materials with recycling of unreacted raw
materials compared with its conducting without recycling.
FORMULATION OF TASKS
OF OPTIMIZATION OF THE PROCESSES
According to the theory of recycling, developed
by M.F. Nagiyev , it is advisable that all without
exception chemical reactions in terms of achieving of
high selectivity and productivity of a unit of a reactor
volume, increasing ﬂ exibility and improving the
controllability of the process should be carried out with
Recycling, in essence, is the feedback with large
potential to affect the process dynamics. Changing the
recycling parameters simultaneously we can increase
the reactor performance relative to raw material and
absolute output of any product of a complex reaction.
In optimization of the processes in any case should be
solved the task of selection of the optimal values of the
process parameters. The set of parameters characterizing
the recycling process, can be divided into the following
(1) Input parameters, parameters of a ﬂ ow that is
input into the recirculation system from outside: a mass
ﬂ ow rate, composition, temperature and pressure of raw
material, a water vapor : raw material ratio.
(2) Output parameters, parameters of the ﬂ ow that
are removed from the system and not returned in it: the
mass ﬂ ow rate, composition, temperature and pressure
of the end products.
(3) Recirculation parameters, parameters of the
ﬂ ows that make up the recirculation loop: the mass ﬂ ow
rates, compositions, temperatures and pressures of the
total load of the reactor and returned ﬂ ows, as well as
a recycling rate and degree of conversion.
In the case of designing new chemical processes in
the number of parameters that optimize the process,
along with technological (temperature, pressure, ﬂ ow,
etc.) are also included structural (length of the reactor,
outer and inner diameters of a coil, a total length of pipes,
etc.). Some of these parameters can be ﬁ xed, other free,
and, moreover, the free parameters may be restricted
from the technological or economic considerations. For
example, the pressure at an outlet of a furnace should be
sufﬁ cient to overcome a ﬂ ow resistance in subsequent