Exercise 1: Control of Simple Processes
Devise control schemes for the following simple processes. It is
necessary to use the hierarchical approach described in the theory
secton. Once again the answers will not be available until the
questions have been attempted in class although it is possible to look
at the complete flowsheet before attempting to put control loops
on it.
Acetone Recovery
Acetone vapour in a byproduct gas is absorbed in a nonvolatile solvent.
It is then recovered in a flash separator.
Answer
Chlorine Removal
Chlorine in a nonaqueous product stream is stripped using air, then
absorbed in aqueous NaOH.
Answer
Butadiene Purification
Butadiene is extracted from a reactor product using a high boiling
solvent which is then recovered by distillation. The nature of the
impurities is not specified. An assumption made is that they are all
removed in the solvent, and the distillation is required only to recover
this. This implies that all the impurities are heavier than butadiene,
which has a low boiling point of about 290K.
Answer
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