How does a distillation tower work?
       Distillation is a typical unit operation for separating mutually miscible liquid mixtures in chemical production. Its essence is multi-type distillation, that is, under certain pressures, the different boiling points or saturated vapor pressures of the components of the mutually miscible liquid mixture are used to vaporize the light components (components with lower boiling points or higher saturated vapor pressures). After multiple partial liquid phase vaporization and partial gas phase condensation, the concentrations of the light components in the gas phase and the heavy components in the liquid phase gradually increase, thereby achieving separation.