Abstract
Abstract It is demonstrated that optimization of a total chemical plant results in a sequence of stationary operations, which have to be realised according to a strict schedule. The non-linearities in the incremental costfunction of utilities lead to a switching strategy which consists of alternating lower and higher feedrates. Conditions, which have to be fulfilled, are summed up. A smooth transfer between the successive stationary modes of operation, obviously is an important restriction. In order to study the workability of this strategy, experiments were done by means of an extractive distillation process, carried out in a bench-scale packed column. Relatively simple feedforward control, added to the normal feedback control of the distillation column is found to be adequate.
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