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Workshop Notes
Workshop 7.1 A duplicator block will permit all three simulations to be done at once,
and the results will facilitate easy comparison. Two of the results are comparable. The
third displays a similar trend, but which are correct?
￿ Do the activity coefficient models work for this system?
￿ Were the parameters in the database fit properly?
￿ Should new data be located and custom-fit?
￿ Would an “in the field” design be acceptable for controlling the product compo-
sition (e.g., a secondary sensor loop feeding the set point of the primary control
loop, to make up for model deficiencies)?
Workshop 7.3 A sensitivity study with a plot should be a good guide for a design
specification. See the solutions to Workshops 7.4a and 7.4b.
Workshop 7.4 All Uniquac parameters except Uniq/2 equal must be set to zero.
￿ Where did the list of Uniquac parameters come from? How can their quality be
assessed?
￿ Results show that extraction improves as the temperature gets colder.
REFERENCES
Poling, B. E., Prausnitz, J. M., and O'Connell, J. P., The Properties of Gases and Liquids , 5th ed., McGraw-
Hill, New York, 2000.
Prausnitz, J. M., Lichtenthaler, R. N., and de Avezedo, E. G., Molecular Thermodynamics of Fluid-Phase
Equilibria , 3rd ed., Prentice Hall, Upper Saddle River, NJ, 1999, p. 41.
Wa la s, S. M ., Phase Equilibria in Chemical Engineering , Butterworth, Woburn, MA, 1985, p. 388.
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