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Abstract
Abstract A distillation column control algorithm that uses the parameters of differential tray temperatures and differential pressure across sections of distillation trays was investigated. A general short cut design method was incorporated as part of the overall control scheme to detect and correct, utilizing conventional three mode (PID) control, the values of these parameters during transient operation of the distillation column A determination of the usefulness of the algorithm was made through the application of a dynamic multicomponent distillation computer model. The column model included control details for temperature control, composition control, material balance control, and feed forward control configuration The results of the simulation studies showed that, except for the Shinskey feed forward system, an improvement in the detection of upset conditions and control of the distillation column could be obtained by application of the improved algorithm to the rectifying section of the column. Negligible improvement over conventional control was obtained by application of the same algorithm to the stripping section of the distillation column investigated
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