Erik Bek-Pedersen

Design and synthesis of distillation systems using a driving-force-based approach

Abstract A new integrated framework for synthesis, design and operation of distillation-based separation schemes is presented here. This framework is based on the driving force approach, which provides a measure of the differences in chemical/physical properties between two co-existing phases in a separation unit. A set of algorithms has been developed within this framework for design of simple as well as complex distillation columns, for the sequencing of distillation trains, for the determination of appropriate conditions of operation and for retrofit of distillation columns. The main feature of all these algorithms is that they provide a simple “visual” method to obtain near-optimal solutions in terms of energy consumption without rigorous simulation and/or optimisation. Several illustrative examples highlighting the application of the integrated approach are also presented.

Determination of optimal energy efficient separation schemes based on driving forces

Abstract A new integrated approach for synthesis, design and operation of separation schemes is presented. This integrated approach is based on driving forces that promote the desired separation for different separation techniques. A set of algorithms needed by the integrated approach for sequencing and design of distillation columns and for generating hybrid separation schemes are presented. The main feature of these algorithms is that they provide a ‘visual’ solution that also appears to be near optimal in terms of energy consumption. Several illustrative examples highlighting the application of the integrated approach are also presented.

Design and Analysis of Separation by Distillation: Role of Property Models

As part of the process model, property models play a very important role in the design of separation by distillation. This paper provides a systematic analysis of the property models with special emphasis on relations between separation task, equilibrium properties and energy consumption. The presented analysis helps to establish the role of properties and the property model in design of separation by distillation. Based on the roles of properties and property models, a general guideline that serves as a useful roadmap for design and analysis of various types of separation with distillation is proposed. Finally, the roles and the guidelines are highlighted through simple illustrative examples.

Tools for Reactive Distillation Column Design: Graphical and Stage-to-Stage Computation Methods

Publisher Summary This chapter introduces a new set of graphical and multicomponent stage-to-stage computation methods for the design of reactive distillation columns. These design methods are based on the element mass balance approach. The methods developed are similar to those typically employed for nonreactive systems. For binary element systems, which may be ternary or higher in terms of mixture compounds, a simple reactive McCabe–Thiele method has been developed. For design of ternary element systems, which are usually quaternary or higher in terms of mixture compounds, a reactive stage-to-stage calculation method has been developed. For columns comprising reactive and nonreactive stages, the stage-to-stage procedure is used. The driving force approach of Gani and Bek–Pedersen has been extended to application in reactive separation systems. The methods have been tested in a systematic manner with several reactive systems. The chapter discusses the methyl tert-butyl ether (MTBE) reactive system. All design examples have been verified through rigorous simulations.