February 2012
Intermediate to advanced
912 pages
29h 5m
English
Content preview from Introductory Chemical Engineering ThermodynamicsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 12. Van Der Waals Activity Models
Nothing is more practical than a good theory.1
Clausius
Empirical models like the Redlich-Kister expansion provide a significant improvement over the ideal solution approximation, but they lack the kind of connection with the molecular perspective that we have developed in Chapters 1 and 7. The empirical models of Chapter 11 are useful for determining the activity coefficients from a given expression for GE, but they suggest little about the form that GE should assume. As we develop models that incorporate physical insight more closely, we also obtain greater predictive power.
Section 12.1 introduces concepts common to many models based on the van der Waals approach including random mixing rules and the ...
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