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B. Wittgens and S. Skogestad, ``Multivessel batch distillation - Potential energy savings'', IFAC symposium DYCOPS-5, Corfu, Greece, 08-10 June 1998, 515-520.

Abstract.
A conventional batch distillation column operated under feedback control applying the proposed policy is compared to the multivessel batch distillation column. In some cases we found that an increase in production rate up to 50 % is possible by using multivessel batch distillation instead of a conventional batch distillation column with similar column length. Besides the considerable reduction in energy usage, the main advantage with the multivessel batch distillation column is probably its much simpler operation compared to a conventional batch distillation column.