| Abstract
| - A three-stage systematic model-based analysis methodology for the integrated design−control for chemicalprocess with a reaction−separation with recycle scheme is presented. At the core of the methodology, amodel-based analysis of first-principles models of different complexities identifies the important interactionsbetween the design and process variables, so that specified design targets may be achieved. Stage 1 in themodel-based methodology simplifies the design−control problem, such that the main operations are identified.The corresponding model, which has been developed in terms of dimensionless variables, helps to identifythe limiting values of a set of lumped (design process) variables and locates operational windows whereprocess feasibility can be assessed. In stage 2, more-detailed models are developed by delumping the set oflumped variables and relaxing the assumptions of stage 1. The only solutions to be considered are those lyingwithin the bounds (operation windows) defined in stage 1. The objective of stage 2 is to identify the locationof an optimal operation based on a specified design target. Stage 3 is used as a verification stage, by meansof more-rigorous models in steady-state and dynamic models. Through the solution of a hierarchicalsubproblems, the solution of a complex design−control problem is therefore obtained systematically, alongwith an understanding of the process behavior. The ethylbenzene production process is used to highlight thedesign features of the methodology.
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