Countercurrent extraction cascade with backmixing

The relative inflow and outflow contributions for each phase of any stage n, of the cascade is shown in Fig. 3.39. 

Allowing for the additional backmixing flow contributions, the component balance equation for the two phases in stage n of the cascade are now 

Although more complex in form, the resulting model equations provide no major additional difficulty, and solution is also easily obtained. Multistage extraction with backmixing is covered in the simulation example EQBACK. 

6 Countercurrent Extraction Cascade with Slow Chemical Reaction 

A countercurrent extraction cascade with reaction A + B C was considered by Ingham and Dunn (1974), as shown in Fig. 3.40. The reaction takes place between a solute A in the L-phase, which is transferred to the G-phase by the process of mass transfer, where it then reacts with a second component, B, also in the G-phase, to form an inert product, C. 

The general component balance form of equation gives 

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Five stage countercurrent extraction cascade with backmixing Equilibrium stage model... 

Dynantics of Heat Exchangers, Simple Batch Extraction, Multi-Solute Batch Extraction, Multistage Countercurrent Ctiscade, Extraction Cascade with Backmixing, Countercurrent Extraction Cascade with Reaction, Absorption with Chemical Reaction, Membrane Transfer Processes... 

The full model is described in Section 3.3.1.5 and consists of a countercurrent stagewise extraction cascade with backmixing in both phases. 

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