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

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Chapter 15. Introduction to Diffusion and Mass Transfer

Except for the short introductory Section 1.3, to this point the entire analysis of separation processes has been equilibrium based. Effects of nonequilibrium operation have been lumped into either a stage efficiency (Sections 4.11, 10.2, 12.5, and 13.5) or to the height equivalent of a theoretical plate (HETP; Sections 10.9 and 10.11). We must move beyond an equilibrium analysis if we want to be able to predict values of the stage efficiency and the HETP (Chapter 16), to study membrane separators (Chapter 17), or to study sorption separations (Chapter 18). For all of these situations, we must look at the mass transfer occurring in the separator. This chapter presents the fundamentals of ...

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