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Introductory Chemical Engineering Thermodynamics, 2nd ed.
J.Richard Elliott, Carl T. Lira
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Lira replied on Permalink
UNIQUAC concepts (6:44)
UNIQUAC concepts (6:44) (msu.edu)
Concepts and assumptions used in developing the UNIQUAC activity coefficient method. This method introduced the use of surface area as an important quantity in calculation of activity coefficients.
Lira replied on Permalink
Volumes and Areas from Groups (3:04)
Volumes and Areas from Group Contributions (3:04)
Group contributions are used widely in property prediction. The volumes and surface areas have been determined by x-ray data and high-temperature collision data. The UNIQUAC and UNIFAC activity coefficient methods use these quantities to calculation volume fractions and surface area fractions. The assignment of functional groups for a molecule must be done carefully to assure agreement with the groups used by the model developers.
Comprehension Questions:
1. Estimate R and Q for 1,4 dihydroxy benzene.
2. Estimate R and Q for n-propyl alcohol and compare them to the values for IPA.
3. Estimate R and Q for methyl-npropyl ketone.