How should a system with side-line towers be defined?
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I am self-studying PROⅡ. How do I define a side line tower? It seems a bit complicated to decide how to choose variables and parameters, and then how to make adjustments :( The total mass fraction of benzene and toluene in stream 1007 at the top of the tower is required to be 0.35, the benzene content in stream 1015 at the bottom of the tower is 0.0005, and the toluene fraction in the side-stream taken from the bottom of the tower is 0.946.
At the bottom of the tower are components heavier than toluene; the toluene intermediate is extracted from the middle section, and no requirements regarding the composition levels have been set for now.