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

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13.8 Mixing Calculations and the Lever-Arm Rule

Triangular diagrams can be used for mixing calculations. In Figure 13-15A a simple mixing operation is shown, where streams F1 and F2 are mixed to form stream M. Streams F1, F2, and M can be either single-phase or two-phase. Operation of the mixer is assumed to be isothermal. For ternary systems there are three independent mass balances. With right triangular diagrams it is convenient to use the diluent balance, the solute balance, and the overall mass balance. The solvent mass balance will be automatically satisfied if the three independent balances are satisfied. The nomenclature is in fraction units (see Table 13-2).

Figure 13-15. Mixing operation; (A) equipment, (B) triangular diagram

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