Papers by Nickolay M Ostrovskii
DOAJ (DOAJ: Directory of Open Access Journals), Nov 1, 2007
Despite intensive research over the last 50 years, many questions concerning ethylene polymerizat... more Despite intensive research over the last 50 years, many questions concerning ethylene polymerization by supported chromium oxide are still unanswered. Hence, the very fundamental issues of this polymerization are discussed in this paper. It is shown that a charge percolation mechanism (CPM) of olefin polymerization by Ziegler-Natta transition metal complexes, recently proposed by us, can give the answers in this case, too.
The olefins polymerization process in a slurry reactor is discussed. The reaction rate dynamics w... more The olefins polymerization process in a slurry reactor is discussed. The reaction rate dynamics was analyzed and the contributions of feed flow, gas-liquid mass transfer, polymerization reaction, and catalyst deactivation were estimated. The propylene solubility in a solvent mixture “heptane” was calculated using Soave-RedlichKwong equation of state. These data were then approximated by Henry-like equation and the results were verified in experiments. The influence of propylene dissolving in ”heptane which was examined in special experiments without catalyst has provided the independent estimation of gas-liquid mass transfer coefficient. It has been shown that the reaction rate during the first 20-30 min of test is much lower (or higher) than total monomer consumption, depending on reactant addition sequence. The method of kinetic experiments interpretation and corresponding mathematical model are proposed. The method enables to estimate the kinetic parameter of monomer dissolution,...
Hemijska industrija, 2016
Since the beginning of 90s of last century both the petroleum industry and petrochemical industry... more Since the beginning of 90s of last century both the petroleum industry and petrochemical industry have operated in difficult circumstances. In particularly, margins of petroleum and petrochemical industry were exacerbated during global economic crisis in 2008-2009 years. At that time, as one option that could be the solution, the global analysts had started to more intense investigate the benefits of Refining-Petrochemical Integration. Shortly afterwards, more and more petroleum refineries and petrochemical manufacturers began to see the future in this kind of operational, managerial, marketing and commercial connection. This paper evaluates, in particular, the achieved level of integration of refinery and petrochemical businesses in Central and South-Eastern Europe. And specifically, the paper identifies current capabilities and future chances of linking this kind of integration between Serbian refining and petrochemical players. The viability of integration between possible actors...
Metal and support deactivation upon the coking of supported metal catalysts occurs via different ... more Metal and support deactivation upon the coking of supported metal catalysts occurs via different mechanisms. Several models of coking are presented. The most complete complex model is developed for supported platinum catalysts. It implies multilayer coke formation on support, the rapid formation of polymeric coke capable of self-regeneration by hydrogen directly in the course of reaction on platinum, and the slow conversion of this coke into graphite-like coke, which is removed only by oxidative regeneration. The models are experimentally supported for cyclohexane dehydrogenation.
The equations for deactivation during multilayer coke formation occurring via consecutive additio... more The equations for deactivation during multilayer coke formation occurring via consecutive addition are derived. This mechanism is true for many oxide acid catalysts. The available linear and exponential relations between the activity and the coke concentration are the specific cases of these equations. The models were experimentally supported for dehydrogenation, isomerization, and reforming.
Reaction Kinetics and Catalysis Letters, 1988
The activity of Pt/Al2O3 catalysts with various contents of metallic (Pto) and electron-deficient... more The activity of Pt/Al2O3 catalysts with various contents of metallic (Pto) and electron-deficient (Ptσ) platinum has been examined in dehydrocyclization of n-heptane and dehydrogenation of cyclohexane. In the former case it is proportional to the number of surface Ptσ atoms and in the latter case it is proportional to the BET surface of metallic platinum Pto.
Chemical Engineering Journal, 2006
ABSTRACT A rigorous approach to designing deactivation kinetic models is proposed, based on detai... more ABSTRACT A rigorous approach to designing deactivation kinetic models is proposed, based on detail mechanisms of catalytic reaction and deactivation. It is demonstrated that deactivation equations can be derived using the Bodenstain principle of quasi-steady state approximation. A general equation applicable to any linear mechanism is suggested. Several examples are given regarding various reaction mechanisms and deactivation.
Hemijska Industrija , 2016
Since the beginning of 90s of last century both the petroleum industry and petrochemical industry... more Since the beginning of 90s of last century both the petroleum industry and petrochemical industry have operated in difficult circumstances. In particularly, margins of petroleum and petrochemical industry were exacerbated during global economic crisis in 2008–2009 years. At that time, as one option that could be the solution, the global analysts had started to more intense investigate the benefits of Refining-Petrochemical Integration.
Shortly afterwards, more and more petroleum refineries and petrochemical manufacturers began to see the future in this kind of operational, managerial,
marketing and commercial connection.
This paper evaluates, in particular, the achieved level of integration of refinery and petrochemical businesses in Central and South-Eastern Europe. Specifically, the paper identifies current capabilities and future chances of linking this kind of integration
between Serbian refining and petrochemical players. The viability of integration between possible actors and benefits of every single refining-petrochemical interface in Serbia depend on many factors, and therefore each integrated system is unique and
requires prior serious cost benefit analysis.
Hemijska industrija, 2003
On the basis of analyzing kinetic experimental data performed in laboratory integral reactors a l... more On the basis of analyzing kinetic experimental data performed in laboratory integral reactors a lumping kinetic model of the "Zeoforming" process was developed. A reaction scheme of the lumped components was proposed, that was adapted to the technological requirements. The reaction rate constants and activation energies were estimated, that are valid for certain feed compositions. The model is intended for further modeling and optimization of the process.
Chemical Industry and Chemical Engineering Quarterly, 2007
In previous papers [1,2], we reported on the reaction kinetic and catalyst deactivation models fo... more In previous papers [1,2], we reported on the reaction kinetic and catalyst deactivation models for the Zeoforming process. The significant coking of a catalyst takes place, and two types of coke are formed. In this work the equations of coke accumulation are derived and its relations with relative activities are presented and discussed.
Hemijska industrija, 2004
A model of catalyst deactivation in the "Zeoforming" process was developed. The deactiv... more A model of catalyst deactivation in the "Zeoforming" process was developed. The deactivation rate constants and activation energies were estimated. The role of adsorbed oligomers in the reaction and the deactivation kinetics were examined. The model is intended for further modeling and optimization of the process.
Surfactant Science Series, 2006
Ethene polymerization by silica supported chromium oxide has been discovered some fifty years ago... more Ethene polymerization by silica supported chromium oxide has been discovered some fifty years ago]. It is generally believed that the insertion mechanism of Ziegler-Natta-Kaminsky polymerization can be also applied in this case. Despite the very extensive research, however, there are still many open questions concerning: (1) Structure and oxidation state of active centre; (2) Mechanism of initiation and polymerization; (3) Occasional appearance of induction period; (4) Very broad molecular weight distribution (MWD) of PEHD. Evidently, the insertion mechanism is wrong. Recently we have proposed a charge percolation mechanism (CPM) of olefin polymerization in presence of transition metal compounds. The aim of this work is to present that the CPM also can be applied to explain the ethene polymerization by CrOx supported on SiO2 or some other supports. We present here only some of the published empirical facts that are important for the CPM and shortly present the CPM followed by some s...
A mathematical model of oxidative dehydrogenation of n -butane is proposed. It is based on a kine... more A mathematical model of oxidative dehydrogenation of n -butane is proposed. It is based on a kinetic model and takes into consideration two types of catalytic center. Ways of raising the divinyl formation selectivity of the process in a two-reactor system with a circulating catalyst are found.
Studies in Surface Science and Catalysis, 2000
ABSTRACT The structural features, texture and surface properties of highly dispersed partially su... more ABSTRACT The structural features, texture and surface properties of highly dispersed partially substituted framework zirconium phosphates synthesized via sol-gel or mechanochemical activation route followed by the hydrothermal treatment in the presence of polyethylene oxide were studied and compared with catalytic properties in the pentane and hexane isomerization. The most efficient promoter was found to be Si which increases the surface density of the Broensted Zr-OH centers. Pt-supported Si-modified systems demonstrate promising activity and selectivity in propane and hexane hydroisomerization at 300-400 °C
Catalysis Letters, 1997
A three-phase catalytic membrane reactor (3PCMR), designed for the evaluation of catalytic membra... more A three-phase catalytic membrane reactor (3PCMR), designed for the evaluation of catalytic membranes, was successfully applied to carry out selective oxidation of ethylene to acetaldehyde under mild conditions. The reaction was performed over carbon- supported Pd and Pt partial hydrophobic catalytic membranes by using different redox couples as reaction medium. Results have shown that reaction proceeds with relevant rate and
Hemijska industrija, 2014
The process of drying of porous polymer powder (polypropylene) intended to remove the solvent (he... more The process of drying of porous polymer powder (polypropylene) intended to remove the solvent (heptane) is analyzed. The dryer consists of two stages (apparatus) with multizone fluidized bed. The mathematical model of the process in multizone fluidized bed is proposed. The rate-limiting step, depending on diameter of polymer particles, is determined. It was found that in relatively large particles (>200 ?m) the rate of drying is limited by intraparticle diffusion. A way to decrease the energy consumption in drying has been also discussed and verified in experiments.
Chemical Industry and Chemical Engineering Quarterly, 2006
Theoretical Foundations of Chemical Engineering, 2008
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Papers by Nickolay M Ostrovskii
Shortly afterwards, more and more petroleum refineries and petrochemical manufacturers began to see the future in this kind of operational, managerial,
marketing and commercial connection.
This paper evaluates, in particular, the achieved level of integration of refinery and petrochemical businesses in Central and South-Eastern Europe. Specifically, the paper identifies current capabilities and future chances of linking this kind of integration
between Serbian refining and petrochemical players. The viability of integration between possible actors and benefits of every single refining-petrochemical interface in Serbia depend on many factors, and therefore each integrated system is unique and
requires prior serious cost benefit analysis.
Shortly afterwards, more and more petroleum refineries and petrochemical manufacturers began to see the future in this kind of operational, managerial,
marketing and commercial connection.
This paper evaluates, in particular, the achieved level of integration of refinery and petrochemical businesses in Central and South-Eastern Europe. Specifically, the paper identifies current capabilities and future chances of linking this kind of integration
between Serbian refining and petrochemical players. The viability of integration between possible actors and benefits of every single refining-petrochemical interface in Serbia depend on many factors, and therefore each integrated system is unique and
requires prior serious cost benefit analysis.