Your company has decided to produce P by the reaction A —> P. Unfortunately, there is a parallel reaction, A —> B. Both reactions are irreversible. Both reactions are incomplete; the reactor effluent contains reactant A, product P and worthless by-product B.
The boiling points at I atm are P (30°C), A (50°C), and B (55°C). Purifying P to 299% (minimum purity to market) by distillation is easy, but separating A and B is more difficult.
To produce and sell product P, you need only a reactor and separator I. You have two options for the A+B mixture in the “separator I bottoms” stream: ( I) you may recycle some of the A+B mixture, for example, by purging 50% and sending 50% through the recycle, or (2) you may purchase a second separator to separate A from B before recycling.
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