Cascade with side streams

This unit can simulate any type of separation processes, as distillation, absorption, stripping, or extraction columns, modelled as cascade of counter-current equilibrium stages. The model Radfrac in Aspen Plus is particular powerful. It is first built on the inside-out algorithm that increased dramatically the robustness in simulating distillation-based operations (Boston, 1980). Columns with multiple feeds, side streams products, stage heaters or coolers, can be treated, as illustrated in Fig. 3.13. The following capabilities are generally available ... 

Several cells are combined to form a cascade. Both anolyte and catholyte sides are fed with the same starting solution. This consists of the depleted solution from the oxidation, condensates, and washing streams from the catholyte scrubbing towers. 

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