Download or read book Unsteady State Processes in Catalysis written by Yu S. Matros and published by VSP. This book was released on 1990-12 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades the investigation methods of unsteady state catalytic processes have been widely developed by the response-technique methods. From this research emerged the realization that under unsteady state conditions and, especially under artificially created ones, it is possible to increase the productivity or selectivity of a catalyst or a catalytical process as a whole. The scientific literature in this field is mostly theoretical and aims at structuring and analysing mathematical models of unsteady state catalytical processes. In this book the theoretical and applied aspects of an efficiency of artificially created unsteady conditions in catalysis are discussed. It contains the lectures from researchers from all over the world that were held during the International Conference ''Unsteady State Processes in Catalysis'', 5--8 June 1990, Novosibirsk (USSR). Topics include: -- The problems of dynamics of a catalyst surface -- Kinetic models of unsteady processes -- Dynamics of chemical reactors -- Artificially created unsteady processes in a catalytic reactor.

Download or read book Unsteady Processes in Catalytic Reactors written by I︠U︡riĭ Shaevich Matros and published by Elsevier Science Limited. This book was released on 1985-01-01 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major topic of the book is the investigation of steady and unsteady processes in reactors with a fixed catalyst bed and the formulation of practical recommendations for realizing catalytic processes of high efficiency. The material is based mainly on research carried out at the Novosibirsk Institute of Catalysis of the Siberian Branch of the USSR Academy of Sciences. Most of the information is technologically orientated and in presenting the subject matter mathematical calculations have often been omitted while the physical sense of the results obtained from the study of mathematical models is always discussed. The book has a comprehensive and detailed bibliography and keyword index. It will be especially useful for specialists in the field of chemical engineering at industrial companies who are working on the development of catalytic processes, in the operation of chemical reactors and for students and post-graduate students of the same disciplines.

Download or read book Unsteady Processes in Catalytic Reactors written by YU Sh Matros and published by Elsevier Science. This book was released on 1985-09-01 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major topic of the book is the investigation of steady and unsteady processes in reactors with a fixed catalyst bed and the formulation of practical recommendations for realizing catalytic processes of high efficiency. The material is based mainly on research carried out at the Novosibirsk Institute of Catalysis of the Siberian Branch of the USSR Academy of Sciences. Most of the information is technologically orientated and in presenting the subject matter mathematical calculations have often been omitted while the physical sense of the results obtained from the study of mathematical models is always discussed. The book has a comprehensive and detailed bibliography and keyword index. It will be especially useful for specialists in the field of chemical engineering at industrial companies who are working on the development of catalytic processes, in the operation of chemical reactors and for students and post-graduate students of the same disciplines.

Download or read book Catalytic Processes Under Unsteady State Conditions written by Y.S. Matros and published by Elsevier. This book was released on 1988-12-01 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with catalytic processes under forced non-steady-state conditions. It demonstrates, both theoretically and practically, that forced non-steady-state processes are highly efficient compared with steady-state processes, and illustrates this with a wealth of practical examples. The first part of the book describes the theoretical and experimental basis of efficient processes, mathematical models of non-steady-state processes in reactors, influence of a non-steady-state catalyst surface, problems of optimization, the theory of a heat front in the fixed catalyst bed, and methods to create efficient cyclic regimes. The second part considers the following processes: sulphur dioxide oxidation in sulphuric acid production, cleaning of effluent gases from toxic impurities, production of high-potency heat, ammonia and methanol synthesis etc. The book will appeal to many readers: chemical engineers (especially in the field of mathematical modelling of reactors with a fixed catalyst bed); personnel of chemical plants and machine-manufacturing companies dealing with maintenance and installation of catalytic reactors; specialists in detoxification of the effluents from organic admixtures and carbon monoxide; students of technical colleges and universities

Download or read book Unsteady Processes in Catalytic Reactors written by Ûrij Šaevič Matros and published by . This book was released on 1985 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Catalytic Processes Under Unsteady State Conditions written by I︠U︡riĭ Shaevich Matros and published by Elsevier Health Sciences. This book was released on 1989 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with catalytic processes under forced non-steady-state conditions. It demonstrates, both theoretically and practically, that forced non-steady-state processes are highly efficient compared with steady-state processes, and illustrates this with a wealth of practical examples.The first part of the book describes the theoretical and experimental basis of efficient processes, mathematical models of non-steady-state processes in reactors, influence of a non-steady-state catalyst surface, problems of optimization, the theory of a heat front in the fixed catalyst bed, and methods to create efficient cyclic regimes. The second part considers the following processes: sulphur dioxide oxidation in sulphuric acid production, cleaning of effluent gases from toxic impurities, production of high-potency heat, ammonia and methanol synthesis etc.The book will appeal to many readers: chemical engineers (especially in the field of mathematical modelling of reactors with a fixed catalyst bed); personnel of chemical plants and machine-manufacturing companies dealing with maintenance and installation of catalytic reactors; specialists in detoxification of the effluents from organic admixtures and carbon monoxide; students of technical colleges and universities

Download or read book 23 European Symposium on Computer Aided Process Engineering written by Mihaela Iancu and published by Elsevier Inc. Chapters. This book was released on 2013-06-10 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The environment safety and climate changes reduction are two important aspects which partially can be achieved by lowering gaseous emissions emerged from chemical industry. These emissions are characterized by low pollutant concentration, high volumes of gases and low temperatures. Their treatment could emerge in economical sustainable technologies only if the reactors used are capable of high yields, high selectivity and autothermal behavior. The forced unsteady-state reactors are an excellent choice for treating this type of emissions because allow trapping of the moving heat wave inside the catalytic bed when exothermic reactions take place; the catalytic bed acts as a regenerative heat exchanger creating the premises of a sustain autothermal behavior even if the temperature of the feed is low. Nevertheless, the forced unsteady state reactors are characterized by a remarkable complex dynamic behavior, as a consequence of the complex interaction between heat and mass transport phenomena inside the reactor. This dynamic behavior gives rise to a set of spatial-temporal patterns, chaotic changes in concentration and traveling waves of heat and chemical reactivity, difficult to deal with. Therefore, an advance control strategy is needed to be applied in order to tackle with all issues that characterize reactors with improved contact between reactants, in which the thermal wave is stored and which allow improved kinetic activity of the catalyst used. The catalytic activity is the main operation concern for processes with low feed temperatures and constraints related to low emissions of unconverted reactants. Therefore, predictions of reactor pseudo or steady-state performances regarding conversion, selectivity and thermal behavior and the dynamic reactor response during exploitation are important aspects in finding the optimal control strategy. Moreover, the switching time and the reagents concentrations in the feeding zone are the main operating parameters that may be adapted or changed to fulfill the condition of zero emissions when using forced unsteady-state reactors. Nevertheless, due to unsteady state reactors characteristics, the adaptation of these parameters to process requirements reveals important control design problems. Therefore, in this paper the possibility of using an advanced control strategy, combining model predictive control (MPC) with an on-off control was studied in order to handle with problems that arise when using a forced unsteady-state catalytic reactor network (RN) in case of selective catalytic reduction of NOx with ammonia. The RN system consists of a network of three plug-flow reactors in series, operated in a closed loop configuration. The RN dynamic model was developed using MatLab/Simulink software. The results revealed that the proposed control strategy (i.e. the on-off control and MPC) can successfully handle the NOx emissions of this kind of reactors.

Download or read book Experiments in Catalytic Reaction Engineering written by J.M. Berty and published by Elsevier. This book was released on 1999-08-11 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: The science of catalytic reaction engineering studies the catalyst and the catalytic process in the laboratory in order to predict how they will perform in production-scale reactors. Surprises are to be avoided in the scaleup of industrial processes. The laboratory results must account for flow, heat and mass transfer influences on reaction rate to be useful for scaleup. Calculated performance based on these results must also be useful to maximization of profit and safety and minimization of pollution. To this end, information on products as well as byproducts and heat produced must be generated. If a sufficiently large database of knowledge is produced, optimization studies will be possible later if economic conditions change. The field of reaction engineering required new tools. For kinetic and catalyst testing, the most successful of these tools was the internal recycle reactor. Studies in recycle reactors can be made under well-defined conditions of flow and associated transfer processes, and close to commercial operation. The recycle reactor eliminates or minimizes the effect of transfer process, and allows the remaining ones to be known. Features of this book: • Provides insight into a field that is neither well understood nor properly appreciated. • Gives a deeper understanding of reaction engineering practice. • Helps avoid frustration and disappointment in industrial research. This book is short and clear enough to assist all members of the R&D and Engineering team, whether reaction engineers, or specialists in other fields. This is critical in this new age of computation and communication, when team members must each know at least something of their colleagues' fields. Additionally, many scientists in more exploratory or fundamental fields can use recycle reactors to study basic phenomena free of transfer interactions.

Download or read book Unsteady State Reverse Operation of a Non isothermal Catalytic Reactor written by Pavoor Ramchandran Venkatachalam and published by . This book was released on 1972 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Periodic Operation of Chemical Reactors written by P. L. Silveston and published by Butterworth-Heinemann. This book was released on 2012-12-04 with total page 793 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive review, prepared by 24 experts, many of whom are pioneers of the subject, brings together in one place over 40 years of research in this unique publication. This book will assist R & D specialists, research chemists, chemical engineers or process managers harnessing periodic operations to improve their process plant performance. Periodic Operation of Reactors covers process fundamentals, research equipment and methods and provides "the state of the art" for the periodic operation of many industrially important catalytic reactions. Emphasis is on experimental results, modeling and simulation. Combined reaction and separation are dealt with, including simulated moving bed chromatographic, pressure and temperature swing and circulating bed reactors. Thus, Periodic Operation of Reactors offers readers a single comprehensive source for the broad and diverse new subject. This exciting new publication is a "must have" for any professional working in chemical process research and development. A comprehensive reference on the fundamentals, development and applications of periodic operation Contributors and editors include the pioneers of the subject as well as the leading researchers in the field Covers both fundamentals and the state of the art for each operation scenario, and brings all types of periodic operation together in a single volume Discussion is focused on experimental results rather than theoretical ones; provides a rich source of experimental data, plus process models Accompanying website with modelling data

Download or read book Alkene Polymerization Reactions with Transition Metal Catalysts written by Yury Kissin and published by Elsevier. This book was released on 2008-03-10 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past 30 years, the field of alkene polymerization over transition metal catalysts underwent several major changes:1. The list of commercial heterogeneous Ziegler-Natta catalysts for the synthesis of polyethylene and stereoregular polyolefins was completely renewed affording an unprecedented degree of control over the polymer structure.2. Research devoted to metallocene and other soluble transition-metal catalysis has vastly expanded and has shifted toward complexes of transition metals with multidentate ligands.3. Recent developments in gel permeation chromatography, temperature-rising fractionation, and crystallization fractionation provided the first reliable information about differences between various active centers in transition-metal catalysts.4. A rapid development of high-resolution 13C NMR spectroscopy resulted in greatly expanded understanding of the chemical and steric features of polyolefins and alkene copolymers. These developments require a new review of all aspects of alkene polymerization reactions with transition-metal catalysts. The first chapter in the book is an introductory text for researchers who are entering the field. It describes the basic principles of polymerization reactions with transition-metal catalysts, the types of catalysts, and commercially manufactured polyolefins. The next chapter addresses the principal issue of alkene polymerization catalysis: the existence of catalyst systems with single and multiple types of active centers. The subsequent chapters are devoted to chemistry and stereochemistry of elemental reaction steps, structures of catalyst precursors and reactions leading to the formation of active centers, kinetics of polymerization reactions, and their mechanisms. The book describes the latest commercial polymerization catalysts for the synthesis of polyethylenes and polypropylene The book provides a detailed description of the multi-center nature of commercial Ziegler-Natta catalysts. The book devotes specialized chapters to the most important aspects of transition metal polymerization catalysts: the reactions leading to the formation of active centers, the chemistry and stereochemistry of elemental polymerization steps, reaction kinetics, and the polymerization mechanism. The book contains an introductory chapter for researchers who are entering the field of polymerization catalysis. It describes the basic principles of polymerization reactions with transition-metal catalysts and the types of commercially manufactured polyolefins and copolymersThe book contains over 2000 references, the most recent up to end of 2006.

Download or read book Paradoxes in Aerohydrodynamics written by Shakhbaz A. Yershin and published by Springer. This book was released on 2016-09-01 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, on the general topic of hydroaerodynamics, investigates a number of exciting applications in this field, addressing specifically issues that allow seemingly paradoxical issues to be dealt with. The first part is devoted to the study of channel flows, in particular the lateral flow of a viscous and viscous-plastic liquid in a ring channel formed by coaxial cylinders. Specifically, the problem of dissipation of mechanical energy in channel flows of highly viscous liquids is addressed and solved. Furthermore, the mechanism leading to hydrodynamic erosion in intra-field pipelines (known as "channelized effect") is identified. Subsequently, a theory for channel flows with mass transfer through porous walls is developed. In the second part, viscous liquid free flows (jets) are investigated. In particular, a dispersion law for turbulent flow is derived and the existence of dynamic invariance in wake flows of variable density is demonstrated. The third part presents new insights from both theoretical and experimental research into concentrated vortex structure formation and development. The conditions for the existence of Taylor-Goertler vortices are determined and the mechanism for their formation is described. Last but not least, the theory of vortex rings, a particularly interesting problem in hydroaerodynamics, is introduced in the last section of this book. Care has been taken, when selecting original theoretical problems of interest, to make the link with related topics in the published literature. At the same time, all experimental research described in this book is given a meaningful physical interpretation and corroborated by suitable theoretical models and computations.

Download or read book Fluid Catalytic Cracking VII written by and published by Elsevier. This book was released on 2011-09-22 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1987, the Petroleum Division of the American Chemical Society (ACS) has sponsored at 3 year intervals an international symposium on fluid cracking catalysts (FCC) technology. This volume collects the recent progress of this technology as reported in the papers presented during the 232th National Meeting of the ACS in San Francisco, September 10-14, 2006.Sixty-six years after the introduction of the fluid cracking catalyst process, it remains the main process of gasoline generation for the estimated 237 millions cars on US roads. Catalysts testing and evaluation still remains a subject of interest, debate and controversy. Lambda sweep testing, testing of SOx, NOx and combustion promoters have been discussed in details together with catalyst evaluation for atmospheric residues and metal contaminated oils cracking.Of particular interest has been the introduction of novel concept in process design aimed at improving cracked product selectivity such as two-stage risers for better gasoline and olefins production and downer technology for high severity processes . The importance of solid state nuclear magnetic resonance (NMR) in the study of crude oils, catalysts and reaction products are illustrated by several examples. Two contributions describe the use of predictive methods to understand FCC aging and deactivationand personal overviews of the development of SOx and combustion promoters technology are presented. * Presents findings from the tri-annual international symposium on fluid cracking catalysts (FCC) technology, sponsored by the Petroleum Division of the American Chemical Society (ACS) * Two contributions describe the use of predictive methods to understand FCC aging and deactivation* Personal overviews by the authors of the development of SOx and combustion promoters technology

Download or read book Mathematical Modeling of Complex Reaction Systems in the Oil and Gas Industry written by Jorge Ancheyta and published by John Wiley & Sons. This book was released on 2024-07-25 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the fundamentals of reaction systems modeling for the age of decarbonization Reactor design is one of the most important parts of the oil and gas industry, with reactor processes and the accompanying technologies constantly evolving to meet industry needs. A crucial component of effective reactor design is modelling complex reaction systems, which can help predict commercial performance, shape safety procedures, and more. At a time when decarbonization and clean energy transition are among the fundamental global technological challenges, it has never been more important for engineers to grasp the cutting edge of reaction system modelling. Mathematical Modeling of Complex Reaction Systems in the Oil and Gas Industry provides a systematic introduction to this timely subject. Each chapter provides a step-by-step description of the kinetic and reactor models for a particular kind of process and its accompanying systems. Backed by voluminous experimental data and incorporating extensive simulation results, the book constitutes an indispensable contribution to the global search for clean energy solutions. Mathematical Modeling of Complex Reaction Systems in the Oil and Gas Industry readers will also find: All the required tools for developing new reactor models for different reaction scales Detailed discussion of topics including hydrocracking of heavy oils, catalyst deactivation, oxidative regeneration of catalysts, and many more Extensive treatment of both steady-state and dynamic simulations Mathematical Modeling of Complex Reaction Systems in the Oil and Gas Industry is ideal for chemical and process engineers, computational chemists and modelers, catalysis researchers, and any other researchers or professionals in petrochemical engineering and the oil and gas industry.

Download or read book Dynamics of Surfaces and Reaction Kinetics in Heterogeneous Catalysis written by G.F. Froment and published by Elsevier. This book was released on 1997-09-03 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many processes of the chemical industry are based upon heterogeneous catalysis. Two important items of these processes are the development of the catalyst itself and the design and optimization of the reactor. Both aspects would benefit from rigorous and accurate kinetic modeling, based upon information on the working catalyst gained from classical steady state experimentation, but also from studies using surface science techniques, from quantum chemical calculations providing more insight into possible reaction pathways and from transient experimentation dealing with reactions and reactors. This information is seldom combined into a kinetic model and into a quantitative description of the process. Generally the catalytic aspects are dealt with by chemists and by physicists, while the chemical engineers are called upon for mechanical aspects of the reactor design and its control. The symposium "Dynamics of Surfaces and Reaction Kinetics in Heterogeneous Catalysis" aims at illustrating a more global and concerted approach through a number of prestigious keynote lectures and severely screened oral and poster presentations.

Download or read book Tenth International Symposium on Chemical Reaction Engineering written by J. R. Bourne and published by Elsevier. This book was released on 2017-05-04 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISCRE 10 Tenth International Symposium on Chemical Reaction Engineering documents the proceedings of the symposium which brought together experts from all over the world to discuss developments in CRE. Efforts were made to cover high added value substances and to encourage papers from industry. Some success was achieved, but there remain significant gaps between Chemists and Chemical Engineers when considering high added value products as well as between researchers and practitioners of CRE. The volume begins with plenary papers covering topics such as challenges in reactor modeling; bioreactor engineering; the design of reaction systems for specialty organic chemicals. This is followed by papers presented during the eight technical sessions. Technical session A focused on the modeling and control of chemical reactions. Technical session B was devoted to studies on biotechnology. Technical session C covered mixing while Technical session D dealt with special reactor systems and chemicals. The papers in Technical session E examined reactions for emission control and recycling. Technical session F covered the safety aspects of CRE. Technical session G focused on the experiments with multiphase reactions while Technical session H dealt with catalytic reactors.

Download or read book CJChE written by and published by . This book was released on 2005-08 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: