In this study the optimal control for the operation of multicomponent batch distillation for a ternary mixture of hydrocarbons (ie. cyclohexane-heptane-toluene) separation in an open-mode double rectifier configuration. Hereby, various influences are investigated on the optimal control pattern: 1) the influence of the total pressure at the top of the column, and, 2) the influence of the initial mixture composition with the influence of the total pressure at the top of the column. Moreover, within both previously mentioned investigations, the investigation of the influence of tray holdup is embedded. All the factors mentioned above affect the optimal control pattern, and, what could be realized is that the more the parameters vary more the optimal control tends to follow a clear "bang-bang" policy, however, this is by the