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

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15.7.2 Maxwell-Stefan Equations for Binary Nonideal Systems

For nonideal systems the generalized form of the driving forces in Eqs. (15-52) are based on the derivative of the chemical potential μi (Datta and Vilekar, 2010; Krishna and Wesselingh, 1997; Taylor and Krishna, 1993; Wesselingh and Krishna, 2000). Since nonidealities are most common in liquids, we will write the equations in terms of liquid mole fractions.

Image

(15-54a)

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(15-54b)

For ideal gases, the driving force on the left side of these equations reduces to (1/P)dpi/dz, which for constant ...

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