Design and Control of Distillation Systems for Separating Azeotropes

Hands-on guidance for the design, control, and operation of azeotropic distillation systems Following this book's step-by-step guidance, readers learn to master tested and proven methods to overcome a major problem in chemical processing: the distillation and separation of azeotropes. Practical in focus, the book fully details the design, control, and operation of azeotropic distillation systems, using rigorous steady-state and dynamic simulation tools. Design and Control of Distillation Systems for Separating Azeotropes is divided into five parts: Fundamentals and tools Separations without adding other components Separations using light entrainer (heterogeneous azeotropic distillation) Separations using heavy entrainer (extractive distillation) Other ways for separating azeotropes The distillation methods presented cover a variety of important industrial chemical systems, including the processing of biofuels. For most of these chemical systems, the authors explain how to achieve economically optimum steady-state designs. Moreover, readers learn how to implement practical control structures that provide effective load rejection to manage disturbances in throughput and feed composition. Trade-offs between steady-state energy savings and dynamic controllability are discussed, helping readers design and implement the distillation system that best meets their particular needs. In addition, economic and dynamic comparisons between alternative methods are presented, including an example of azeotropic distillation versus extractive distillation for the isopropanol/water system. With its focus on practical solutions, Design and Control of Distillation Systems for Separating Azeotropes is ideal for engineers facing a broad range of azeotropic separation problems. Moreover, this book is recommended as a supplemental text for undergraduate and graduate engineering courses in design, control, mass transfer, and bio-processing.

Table of Contents:
PREFACE. ACKNOWLEDGEMENTS. PART 1 FUNDAMENTALS AND TOOLS. 1 INTRODUCTION. 1.1 History. 1.2 Applications. 1.3 Literature. 1.4 Multiple Steady States. References. 2 PHASE EQUILIBRIUM. 2.1 Phase Equilibrium Relationships. 2.2 Equations Describing Phase Equilibrium Relationships. 2.3 Diagrams For Binary Systems. 2.4 Ternary Diagrams. 2.5 Data Regression. 2.6 Group Contribution Method. 2.7 Conclusion. References. 3 STEADY-STATE DESIGN IN ASPEN PLUS. 3.1 Building a Steady-State Model. 3.2 Unit Operation Blocks Used in this Book. 3.3 Add a Nondatabank Component. 3.4 Conclusion. References. 4 DYNAMICS AND CONTROL IN ASPEN DYNAMICS. 4.1 Sizing of Process Vessels. 4.2 Sizing of Pumps, Compressors, and Control Valves. 4.3 Controllers and Dynamic Elements. 4.4 Controller Tuning. 4.5 Ratio and Cascade Control. 4.6 Conclusion. PART 2 SEPARATIONS WITHOUT ADDING OTHER COMPONENTS. 5 PRESSURE-SWING AZEOTROPIC DISTILLATION. 5.1 Tetrahydrofuran–Water System. 5.2 Acetone–Methanol System. 5.3 Pentane–Methanol System. 5.4 Conclusion. References. 6 PRESSURE SWING WITH HEAT INTEGRATION. 6.1 THF–Water System Steady-State Design with Heat Integration. 6.2 THF–Water System Dynamics and Control. 6.3 Heat Integration in an Acetone–Methanol System. 6.4 Conclusion. References. 7 HETEROGENEOUS BINARY AZEOTROPES. 7.1 n-Butanol-Water System. 7.2 Phase Equilibrium. 7.3 Steady-State Design. 7.4 Dynamics and Control. 7.5 Conclusion. References. PART 3 SEPARATIONS USING A LIGHT ENTRAINER (HETEROGENEOUS AZEOTROPIC DISTILLATION). 8 ISOPROPANOL–WATER (CYCLOHEXANE AS THE ENTRAINER). 8.1 Feasible Column Sequence for the Separation. 8.2 Steady-State Design of an Isopropanol–Water System. 8.3 Overall Control Strategy Development. 8.4 Conclusion. References. 9 ACETIC ACID–WATER (ISOBUTYL ACETATE AS THE ENTRAINER). 9.1 Comparison of Three Candidate Entrainers. 9.2 Control Strategy Development. 9.3 Industrial Column with Preliminary Dynamic Simulations. 9.4 Industrial Column with Continuous Side-Stream Draw Off. 9.5 Side Draw with a Practical Automatic Purging Strategy. 9.6 Conclusion. References. PART 4 SEPARATIONS USING HEAVY ENTRAINER (EXTRACTIVE DISTILLATION). 10 ISOPROPANOL-WATER (DIMETHYL SULFOXIDE AS THE ENTRAINER). 10.1 Comparing Entrainers: Dimethyl Sulfoxide Versus Ethylene Glycol. 10.2 Steady-State Design and Economical Analysis. 10.3 Overall Control Strategy Development. 10.4 Conclusion. References. 11 EXTRACTIVE DISTILLATION OF THE ACETONE-METHANOL SYSTEM. 11.1 Acetone–Methanol–Water Phase Equilibrium. 11.2 Steady-State Design. 11.3 Dynamics and Control. 11.4 Heat-Integrated System. 11.5 Effect of Solvent on Controllability. 11.6 Conclusion. References. 12 MAXIMUM-BOILING AZEOTROPES. 12.1 Acetone–Chloroform System Steady-State Design. 12.2 Dynamics and Control. 12.3 Conclusion. Reference. PART 5 OTHER WAYS FOR SEPARATING AZEOTROPES. 13 BATCH DISTILLATION OF AZEOTROPES. 13.1 Batch Extractive Distillation (Acetone–Methanol with Water as the Entrainer). 13.2 Batch Extractive Distillation (Isopropanol–Water with DMSO as the Entrainer). 13.3 Acetic Acid Dehydration Via Heteroazeotropic Batch Distillation. 13.4 Multivessel Heteroazeotropic Batch Distillation. 13.5 Conclusion. References. 14 HYBRID DISTILLATION–PERVAPORATION SYSTEMS. 14.1 Introduction. 14.2 Pervaporation Model. 14.3 Pervaporation–Column System. 14.4 Dynamics and Control. 14.5 Process Modification. 14.6 Conclusion. References. INDEX.