Abstract
A flexible computer algorithm for simulation and optimization of a continuous distillation column has been developed. The specifications required from the user are component properties and the column setup in addition to specifications of distillate rate and reflux. Product specifications such as product yields or product purity can also be handled. A rigorous Naphtali-Sandholm procedure is used to solve the full set of column equations, for given values of distillate rate and reflux. An nested loop approach is used when product purities or yields are specified. It is based on exact column profile sensitivities with respect to changes in distillate rate or reflux. The sensitivities are easily calculated from the analytical derivatives used in the basic Naphtali—Sandholm procedure. The sensitivities may also be utilized to determine optimum feed stage locations.
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