Kinetics of Cavitation of an Intermediate Fraction of Coal Tar
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tics of Cavitation of an Intermediate Fraction of Coal Tar N. Zh. Balpanovaa,*, A. Tusipkhana,**, A. M. Gyul’malievb, F. Mac, A. Zh. Kyzkenovad, D. E. Aitbekovaa, Z. S. Khalikovaa, G. G. Baikenovae,f, and M. I. Baikenova,f a Buketov
State University, Karaganda, 100028 Kazakhstan Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119999 Russia c Xinjiang University, Urumqi, 830046 People’s Republic of China d Karaganda State Medical University, Karaganda, 100012 Kazakhstan e Karaganda Economic University of Kazpotrebsoyuz, Karaganda, 100009 Kazakhstan f South Ural State University, Chelyabinsk, 454080 Russia *e-mail:[email protected] **e-mail: [email protected]
b Topchiev
Received December 23, 2019; revised January 29, 2020; accepted March 30, 2020
Abstract—The kinetics of an intermediate fraction of coal tar with a boiling point of 230–300°C in the presence of a Fe3O4 nanocatalyst was studied. The rate constants of cavitation processing of coal tar were calculated using the Simpson method with a random search optimization, and the apparent activation energy of the cavitation process with the intermediate fraction of coal tar was determined. The effects of temperature, processing time, and the Fe3O4 nanocatalyst on the yield of polyaromatic hydrocarbons were shown. Keywords: kinetics, coal tar, cavitation, nanocatalyst, rate constant DOI: 10.3103/S0361521920040023
It is well known [1, 2] that the use of various physical methods (cavitation, mechanochemistry, etc.), which can affect the chemical processes of destruction and hydrogenation, is promising for the conversion of heavy hydrocarbon raw materials. As is well known, cavitation is used only for the cracking of crude oil hydrocarbons. The applicability of a cavitation phenomenon to intensifying the cracking of primary coal tar has been reported [3, 4]. However, published data on the use of cavitation in the cracking of an intermediate fraction of coal tar containing a mixture of polyaromatic hydrocarbons (PAHs) and on the kinetics of cavitation are few in number. The coal tar obtained from coal differs from primary coal tar (PCT) in its high PAH content and low phenol content. Note that PCT is obtained under conditions excluding the hightemperature pyrolysis of coal, and coal tar is prepared by the high-temperature pyrolysis of coal. The kinetics of hydrogenation of heavy and solid hydrocarbon raw materials was studied earlier [5–7] with the use of stiff ordinary differential equations to calculate kinetic parameters. However, the chemical kinetics of complex chemical reactions is characterized by the presence of rapidly and slowly changing variables. The solution of direct kinetic problems is complicated by the rigidity of systems of differential equations that describe the reaction mechanisms due to the reaction stages that proceed at different rates [8].
In this regard, we used the random search optimization method [9] and the Simpson integral method [10] to determine the kinetic parameters of the cavitation treatment of an inte
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