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Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition by Christie John Geankoplis

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13.2. LIQUID PERMEATION MEMBRANE PROCESSES OR DIALYSIS

13.2A. Series Resistances in Membrane Processes

In membrane processes with liquids, the solute molecules must first be transported or diffuse through the liquid film of the first liquid phase on one side of the solid membrane, then through the membrane itself, and finally through the film of the second liquid phase. This is shown in Fig. 13.2-1a, where c1 is the bulk liquid-phase concentration of the diffusing solute A in kg mol A/m3, c1i is the concentration of A in the fluid just adjacent to the solid, and c1iS is the concentration of A in the solid at the surface and is in equilibrium with C1i. The mass-transfer coefficients are kc1 and kc2 in m/s. The equilibrium distribution coefficient ...

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