Download or read book Optimization Methods for Reactor Network Synthesis written by Arthur Eduardo Pastore de Lima (Ph.D.) and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We develop optimization-based approaches for reactor network synthesis suitable for simultaneous process synthesis. We propose reactor network models that consider additional degrees of freedom in terms of the number and composition of inlet and outlet streams, and candidate sets of reactions that can be (de)activated in different reactors. These features provide flexibility to the models, allowing a rich connectivity of the reactor network with other subsystems (e.g., separation and heat exchanger networks) and the formulation of new problems for reactor network synthesis during the early stages of chemical process design. Accordingly, we propose a generalized superstructure-based framework for reactor network synthesis that allows seamless coupling with approaches for separation network synthesis. The candidate reactions are modeled through tasks assigned to reactors. We develop a graph theoretic approach to systematically build the reactor network superstructure. First, we represent the reactions and tasks through multiple graphs and identify competition among tasks with similar roles. Second, we propose integer optimization models based on task competition to determine the number of candidate reactors and interconnecting streams required in the superstructure. Finally, we formulate and solve the optimization model for the integrated synthesis problem. Furthermore, we propose modeling methods that allow us to account for costs in attainable region-based approaches for reactor-separation network synthesis. This approach allows us to determine the bounds of productivity (targets) of a desired component achievable by any reactor-separation network, for a given reaction system and feed stream. We holistically analyze cost trade-offs within the attainable region as well as provide a method to obtain practical targets to be used as benchmarks. We accurately identify the attainable region using the continuous stirred tank reactor (CSTR) equivalence principle and introduce separation models accounting for costs to perform the required separation tasks. Finally, we show how some subregions, typically close to the attainable region boundary, are expensive to achieve.

Download or read book Chemical Reactor Network Synthesis Using Stochastic Optimization Methods written by E. C. Marcoulaki and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimization Based Approaches to Chemical Reactor Network Synthesis written by Luke Ekem Kweku Achenie and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Algorithmic Method for Reactor Network Synthesis written by Luke Achenie and published by . This book was released on 1986 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model and adjoint equations of this formulation form a two-point boundary value problem that interfaces with an efficient optimization strategy. Decisions representing network structure, reactor type and the amount of heat addition are made through continuous parameters in the model. The method is therefore fairly general and can be applied to large kinetic mechanisms with almost any objective function. Literature examples are presented and solved in order to demonstrate the effectiveness of this approach."

Download or read book Optimization in Chemical Engineering written by Suman Dutta and published by Cambridge University Press. This book was released on 2016-03-11 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, optimization of chemical processes is performed using both classical and advanced algorithms.

Download or read book Chemical Reactor Network Targeting and Integration written by Subash Balakrishna and published by . This book was released on 1995 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "While synthesis strategies are well developed for energy integration and separation systems, relatively little work has been done in synthesizing reactor networks. This is due to the complex and nonlinear behavior of the reacting system, coupled with combinatorial aspects that are inherent in all synthesis problems. This paper provides a brief summary of work to date in this area and focuses on targeting approaches for reactor network synthesis. As with energy integration, reactor network targeting seeks to describe the performance of the network without its explicit construction. Once obtained, a network is then determined that is guaranteed to match this target. To achieve these properties, we rely on recent concepts of attainable regions and we extend these to simple optimization formulations. With these formulations network targets can be achieved for isothermal and nonisothermal systems with complex kinetics. Moreover, these optimization formulations can easily be coupled to other process systems such as heat integration and separation sequence. As a result, they provide a framework for integrated process design. This strategy is illustrated with detailed examples. Finally, limitations of the current approach are summarized and topics for future work are outlined."

Download or read book Nonlinear and Mixed Integer Optimization written by Christodoulos A. Floudas and published by Oxford University Press on Demand. This book was released on 1995-10-05 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling a void in chemical engineering and optimization literature, this book presents the theory and methods for nonlinear and mixed-integer optimization, and their applications in the important area of process synthesis. Other topics include modeling issues in process synthesis, and optimization-based approaches in the synthesis of heat recovery systems, distillation-based systems, and reactor-based systems. The basics of convex analysis and nonlinear optimization are also covered and the elementary concepts of mixed-integer linear optimization are introduced. All chapters have several illustrations and geometrical interpretations of the material as well as suggested problems. Nonlinear and Mixed-Integer Optimization will prove to be an invaluable source--either as a textbook or a reference--for researchers and graduate students interested in continuous and discrete nonlinear optimization issues in engineering design, process synthesis, process operations, applied mathematics, operations research, industrial management, and systems engineering.

Download or read book Synthesis of Optimal Chemical Reactor Networks written by Ajay Lakshmanan and published by . This book was released on 1996 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "The reactor is the most influential unit operation in many chemical processes. Reaction systems and reactor design often determine the character of the flowsheet. However, research in reactor network synthesis has met with limited success because of nonlinear reaction models, uncertain rate laws, and numerous possible reactor types and networks. In this paper we take advantage of attainable region properties derived from geometric targeting techniques to design a concise reactor modules [sic] for reactor network synthesis. The reactor module is made up of a continuous stirred tank reactor (CSTR) and a plug flow reactor (PFR) (for two dimensional targeting) or a differential sidestream reactors (DSR) (for higher dimensions). These modules are used to synthesize the optimal reactor network target with respect to a specific objective function and the problem is formulated as a compact MINLP. This new algorithm overcomes many of the drawbacks of existing algorithms. Finally, we solve several example problems to illustrate the feasibility of the proposed algorithm and discuss applications to simultaneous reactor network and process synthesis."

Download or read book Synthesis and Optimization of Reactor Networks and Reactor Separator Recycle Systems written by Antonis Constantinos Kokossis and published by . This book was released on 1992 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Chemical Reactor Networks written by Diane Hildebrandt and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "An interesting problem in chemical reactor theory is finding bounds or targets on a given performance index in a reacting system. Moreover, performance of the reactor subsystem has a key impact on the design of other processing subsystems. It determines the recycle structure of the process, the separation sequence and has a strong influence on the energy and environmental considerations. However, this area of process synthesis has seen relatively little development when compared to heat integration and separation synthesis. As with the design of heat exchanger networks, this approach has evolved into the (discrete and continuous) optimization of network superstructures as well as the performance targeting of the optimal network prior to its construction. In this study we review both methods for reactor network synthesis but concentrate on advances with the latter approach. The targeting approach is based on geometric interpretations of reaction and mixing. It uses a constructive approach to find the attainable region; that is, it effectively captures all possible reactor structures and finds the bounds on the performance of a reacting system. The approach also generates reactor structures which are candidates for the optimal system. It is however severely limited by the dimensionality of the problem and in practice only 2 and 3 dimensional problems have been solved. Nevertheless, insights gained from this geometric approach have led to an understanding of more general properties of optimal reactor structures. In particular the reactors that make up optimal structures are parallel -- series systems of plug flow reactors, CSTR's and differential side stream reactors. Furthermore, the number of parallel structures is related to the dimensionality of the problem. In addition, these properties can be embedded within optimization formulations in order to deal with more complex problems. In particular, we describe several formulations that incorporate simpler properties derived from attainable region concepts. At this point, this approach is not as rigorous as the geometric approach but readily extendable to more complex reaction systems. In addition, it can be integrated with other process subsystems and allows for simultaneous approaches for heat integration, separation structures and reactor network design. In this way, trade-offs resulting from different parts of the process are properly taken into account in the optimization. All of these concepts will be illustrated with numerous examples. Finally, future work will concentrate on the extension of geometric concepts to more general reactor systems as well as to separation systems. These will also lead to more compact optimization formulations and the consideration of larger and more complex process problems."

Download or read book Reactor Network Targeting for Waste Minimization written by Ajay Lakshmanan and published by . This book was released on 1994 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "While process synthesis has matured in the areas of heat exchanger and separation synthesis, reactor network synthesis still remains a challenging problem. Advances in this area have been due to recent developments in methods for superstructure optimization as well as powerful concepts for reactor network targeting before a network is actually developed. In this paper we apply the latter approach to the synthesis of waste minimizing process flowsheets. This area has attracted much interest in the past five years, especially since waste minimization at the source is the most effective way to develop clean and efficient processes. Moreover, the characteristics of these flowsheets are primarily influenced by the reactor network. This study deals with targeting concepts introduced by Horn (1964), developed by Glasser, Hildebrandt and Crowe (1987) and adapted to an optimization framework by Balakrishna and Biegler (1992). Also, we apply concepts of waste minimization and multicriterion optimization, to incorporate the tradeoffs of minimum waste and maximum profit. This approach will be demonstrated on the Williams Otto and Van de Vusse flowsheets, where the potential for developing profitable waste minimizing processes will be shown. Moreover, we demonstrate the ability of the targeting procedure to integrate the energy and separation subsystems as well. This further increases the potential for process improvement."

Download or read book Global Optimization of Chemical Reactors and Kinetic Optimization written by Zayna Ishaq Alhusseini and published by . This book was released on 2013 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work addresses for the first time in chapter 1, the synthesis of globally minimum volume reactor networks featuring SFR/MMR, with the same normalized residence time density function. Global optimality is ascertained by demonstrating that the input-output information maps of SFR and MMR with general RTd/RTD models satisfy all properties required for the application of the IDEAS to the RTd/RTD reactor network problem. The resulting formulation is shown to possess a number of novel properties, which can be used to facilitate its solution. The proposed methodology is demonstrated on three case studies featuring SLFR model in which the Trambouze reaction scheme is carried out. In chapter 2, the concept of NRT is defined, as a production normalized, capital cost measure for a reactor network. For networks consisting of CSTR's, PFR's, and RTD-SFR/MMR, described within the IDEAS conceptual framework, it is shown that NRT is independent of the network's inlet flowrate. The novel concept of Network Residence Time Constrained Attainable Region for Reactor Networks is then introduced. It is shown to be a convex set, points on the boundary of which are identified through repeated solution of increasingly accurate finite linear program approximations of infinite linear programs. A case study featuring a network of reactors in which the Trambouze reaction scheme is carried out. In chapter 3, the optimization of an isothermal monolith reactor is carried out. First, a reaction-diffusion 3-D mathematical model for a monolith reactor is developed. The analytical nature of the obtained solution enables the optimization of a multi-channel 3-D monolith reactor to be carried out. The obtained optimization results are discussed and conclusions are drawn. Chapter 4 presents a novel method for determining reaction kinetics using the reaction invariant reduction method for any set of complex chemical reactions. An effective way for reducing the dimension of chemical reaction mechanisms and to predict the kinetics from a given set of data. The new method will be developed based on a convex formulation of the associated optimization problem. A case study on the Trambouze reaction scheme carried out in a PFR will be used to illustrate the proposed methodology.

Download or read book Global Optimization Techniques for Chemical Process Network Synthesis written by Benjamin John Davis and published by . This book was released on 2009 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Attainable Region Theory written by David Ming and published by John Wiley & Sons. This book was released on 2016-09-12 with total page 817 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recipient of the 2019 Most Promising New Textbook Award from the Textbook & Academic Authors Association (TAA). "The authors of Attainable Region Theory: An Introduction to an Choosing Optimal Reactor make what is a complex subject and decades of research accessible to the target audience in a compelling narrative with numerous examples of real-world applications." TAA Award Judges, February 2019 Learn how to effectively interpret, select and optimize reactors for complex reactive systems, using Attainable Region theory Teaches how to effectively interpret, select and optimize reactors for complex reactive systems, using Attainable Region (AR) theory Written by co-founders and experienced practitioners of the theory Covers both the fundamentals of AR theory for readers new to the field, as we all as advanced AR topics for more advanced practitioners for understanding and improving realistic reactor systems Includes over 200 illustrations and 70 worked examples explaining how AR theory can be applied to complex reactor networks, making it ideal for instructors and self-study Interactive software tools and examples written for the book help to demonstrate the concepts and encourage exploration of the ideas

Download or read book 27th European Symposium on Computer Aided Process Engineering written by and published by Elsevier. This book was released on 2017-09-21 with total page 3064 pages. Available in PDF, EPUB and Kindle. Book excerpt: 27th European Symposium on Computer Aided Process Engineering, Volume 40 contains the papers presented at the 27th European Society of Computer-Aided Process Engineering (ESCAPE) event held in Barcelona, October 1-5, 2017. It is a valuable resource for chemical engineers, chemical process engineers, researchers in industry and academia, students, and consultants for chemical industries. - Presents findings and discussions from the 27th European Society of Computer-Aided Process Engineering (ESCAPE) event

Download or read book Optimization Approaches for Heat Integration and Distillation Network Synthesis written by Lingxun Kong and published by . This book was released on 2019 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: We propose optimization-based approaches for heat integration and distillation network synthesis. For heat integration, we propose a mixed-integer nonlinear programming (MINLP) model for simultaneous process synthesis and utility targeting with general (i.e. classified and unclassified) streams and phase changes. To incorporate capital cost in the optimization, we propose an MINLP model based on the concept of composite-curve-based area targeting, which allows us to estimate both utility and heat exchanger area costs during simultaneous process synthesis and heat integration. Finally, we introduce a transshipment-based approach for simultaneous process synthesis and heat exchanger network synthesis. All three models are tailored to deal with variable stream temperature, flowrate, and hot/cold identity. For distillation column design, we propose a McCabe-Thiele-inspired MINLP approach for both simple and complex columns. The approach utilizes piecewise linear functions to approximate complex VLE relationship and thus ensures tractability without jeopardizing accuracy. The piecewise linear approximating (PWLA) function is obtained by solving a mixed-integer linear programming (MILP) model which is developed separately. The proposed fitting model determines the optimal location of the break points, allowing us to (1) minimize fitting error given a fixed number of segments, or (2) find the minimum number of function segments for a given error tolerance. Finally, we study a new challenging problem in distillation network synthesis: how to synthesize a distillation sequence when streams can have variable, including zero, component flows, which is common when the distillation network is simultaneously designed with the reactor network. To address this, we introduce a superstructure-based method for distillation sequence synthesis using a "matrix" representation. Departing from existing methods, we consider more than one stream that couples the reactor and distillation networks and the proposed method determines the optimal destinations of these streams in the distillation network. We also generalize the Underwood method to account for zero-flows and unknown key components prior to optimization.

Download or read book On the Development of Knowledge Driven Optimisation Methods written by Victoria M. Ashley and published by . This book was released on 2004 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: