Operation of distillation towers
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As the title suggests: Operation of distillation towers – which parameters require special attention!
It’s difficult to clarify such issues in printed form; one should first study the *Textbook of Chemical Engineering Principles*. Ask more questions if there’s anything you don’t understand, because your current understanding is still too general. The key parameters for controlling a distillation tower are product concentration and recovery rate. However, it is difficult in practice to perform online measurement of the product composition; generally, the temperature of the sensitive plate is used as the control variable. The adjustable variables are the reflux ratio and heat load, which are used to control the temperatures at the top (or sensitive plate) and bottom of the tower. Additionally, the liquid levels in the reflux tank and the bottom of the tower are controlled using the recovery rate.
In distillation operations, attention must be paid to vapor-liquid equilibrium, material balance, and heat balance; by controlling these equilibria, it will be possible to manage all relevant parameters properly