PROCESSES WITH RECYCLE - Teach Yourself the Basics of Aspen Plus - page 56

of a solid by-product is much lower than that of the other components; there-
fore, none of that species will appear in a vapor phase. A simple method to
accomplish this is to select a very heavy component, such as eicosane, C 20 H 42 ,
from the database and change its name, for example, to HEAVY, and ignore the
properties that are calculated when that species is part of a mixture.
b. Select the sequences
￿ CRUDSTL, FILTER, STMSTRP
￿ TOLSTILL, DECANT
￿B1,B2
The complete solution may be found at Four-4.bkp. Note that if this were to be
solved rigorously, many problems would be raised by the complex thermodynamics
required. This problem is addressed rigorously in Chapter Fourteen.
Workshop 4.5 A solution to the flowsheet is required. Under the View menu, the
PFD mode must be checked.
REFERENCES
Aspen Plus version 7.0, Help: Stream Table.
Broyden, C. G., Math. Comput . 19(92), 577 - 593 (1965).
Rubin, I. D., Chem. Eng. Symp. Ser. Appl. Math. Chem. Eng ., 55(37), 54 - 62 (1964).
Wegstein, J. H., Accelerating convergence of iterative processes, Commun. ACM , 1, 9 (1958).