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Dynamics and Nonlinear Control of Integrated Process Systems by Prodromos Daoutidis, Michael Baldea

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4 Process systems with purge streams

4.1 Introduction

The present chapter focuses on the dynamics and control of integrated process systems in which impurities are present in small quantities, e.g., introduced as trace components in feed streams or generated as reaction byproducts. When such impurities are not readily removed by the product streams (e.g., if they are inert or noncondensable), they will accumulate in the process due to material recycling. The accumulation of impurities is detrimental to process operation (causing, for example, catalyst poisoning in the reactor) and process economics (owing to an increase in compression and recirculation costs) (Belanger and Luyben 1998, Luyben 2000, Dimian et al. 2001). Understanding the impact ...

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