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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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13.13 Extraction Computer Simulations

Partially miscible ternary and multi-solute extraction systems can be set up for computer calculations. If we redraw and renumber the countercurrent extraction column (Figure 13-20) as shown in Figure 13-30 and relate R to L and E to V, the extraction column is analogous to a stripping or absorption column. The mass balances will be identical to those for absorption and stripping [Eqs. (12-45) to (12-48)] and they can be arranged into a tridiagonal matrix, Eq. (6-13). The new flow rates Lj (Rj) and Vj (Ej) can be determined from the summation Eqs. (12-49) and (12-50) using convergence check Eq. (12-51). The energy balances can again be written as Eq. (12-52) and the multivariate Newtonian solution method ...

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