The HTU-NTU analysis for concentrated absorbers and strippers with one solute is somewhat more complex than for distillation because total flow rates are not constant and solute A is diffusing through a stagnant film with no counterdiffusion, N_{B} = 0. We will assume that the system is isothermal. For stagnant films with N_{B} = 0, Eqs. (15-32a–f) are the appropriate mass transfer equations. The flux equation is (repeat of Eqs. 15-32),

**(16-41)**

where J_{A} is the flux with respect to an axis moving at the molar average velocity of the fluid. As shown in Section 15.4.2 this leads to a transfer rate equation ...

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