Evaluation of coupled reactive distillation performances by means of a rigorous simulation procedure

摘要

A non equilibrium model (NEQ) for multi component separation processes, including liquid and/or gas reactions, is developed in this paper. This model includes the finite mass transfer rate described by Maxwell Stefan equations. It is assumed that the bulk of both the vapour and liquid are perfectly mixed and that the resistance to mass and heat transfer is located in two films at the liquid/vapour interface (film theory). There are no restrictive hypotheses as to the nature and the localisation of the chemical reactions. The phase non ideally and the diffusion coefficient variation are taking into account. The original formulation of mass transfer is described and solved in order to avoid the bootstrap problem. The resulting DAE system is then solved. We describe the resolution and focus on two keys points : the coherent initial state and the reduction of differentiation index. With several examples, a comparison between equilibrium stage model (EQ) and the NEQ model is effected and a sensitivity analysis is done to highlight the importance of the film thickness.