Information Technology Reference
In-Depth Information
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.