A Systematic Approach on the Dynamic Modelling of Reactive Distillation Processes with Potential Liquid Phase Splitting. Building-up the improved PHSP simulation model. II

摘要

As shown in the first part of our work [1], this paper deals with the presence of a three-phase regime (vapour-liquid-liquid) on the reactive distillation (RD) column stages due to a liquid liquid phase splitting (PHSP) between aqueous and organic phases. Special attention has to be paid on this subject, because detecting the three phase regime can lead to different operating and design strategies for RD columns. In this second part of the paper, the authors present in detail their original modeling approach which detects the existence of phase splitting in RD columns. Its hybrid software implementation is composed from a classical model (pseudo-homogeneous, previously presented) in connection with a robust phase splitting algorithm (based on the homotopy-continuation method), performed at each simulation step. By using the proposed model instead of the classical one (with no phases separation - NPHSP), important improvements in terms of simulated system behaviour and results accuracy are obtained.