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Figure 8 Suggested sequences for separating B.T.X. mixture (Example 1).
Rule 3: When using distillation or similar schemes, choose a sequence
that will finally remove the most valuable species or desired
product as a distillate, all other things being equal.
Rule 4: During distillation, sequences that remove the components
one by one in column overheads should be favored, all other
things being equal.
Rule 5: All other things being equal, avoid excursions in temperature
and pressure, but aim high rather than low.
Example 2
Suppose we want to separate a mixture of four components: components
1–4 into pure products. Assume that they are present in the feed in equal
amounts: D 1 , D 2 , D 3, and D 4 .
Copyright 2003 by Marcel Dekker, Inc. All Rights Reserved.
