Equation-based Rigorous Modelling of the NOx Absorption Process: Model Development and Process Optimization (original) (raw)

Computer Aided Chemical Engineering, 2016

Abstract

Abstract This paper addresses the nitrogen oxides absorption process in nitric acid plants. A mechanistic model is developed for this gas-liquid reactive absorption system, able to predict the unit behaviour and support its optimization during regular and transient operating regimes. A rigorous rate-based model was adopted, and a new modelling strategy is proposed to assure the compatibility of mass transfer limitations and equilibrium kinetics. The model has the form of a DAE system, and is solved with an algebraic solver combined with an integration algorithm. This study was focused on the analysis of the unit steady state. The acid strength through the whole column was analysed and a good agreement with industrial data is observed.

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