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Post-combustion amine scrubbing is a highly integrated process that uses extensive material and energy recycling to reduce costs and increase efficiency. As a result, the process variables exhibit a fast time scale at the unit level associated with the large recycle flows and a slow time scale at the plant level associated with the small feed and product flows. A reduced order model was developed for the system, and the material balances were demonstrated to be in nonstandard singularly perturbed form. Only the stripper vapor mole fractions evolve exclusively on the slow time scale in this model form; all other model states have both slow and fast components. By applying a variable transformation, the model is arranged into standard singularly perturbed form. The slow states in this form are the overall process material hold-ups as well as the stripper vapor mole fractions. An effective control strategy for the process should control the CO2 removal rate and overall system inventory on the slow time scale using the small stripper overhead flowrate and a cascaded level setpoint controller, respectively. We show that attempting to control CO2 removal rate with the large solvent recycle rate will likely lead to an ill-conditioned controller

Dynamic Modeling, Validation, and Time Scale Decomposition of an Advanced Post-combustion Amine Scrubbing Process