Comments on "Tuning controllers on distillation columns with the distillate-bottoms structure"

Abstract

Sir: A recent paper by Papastathopoulou and Luyben (1990) discusses modeling and controller tuning of distillation columns using the DB scheme. We would like to point out that their main result, which is to show how models for the DB scheme may be derived from more conventional control structures provided the liquid flow dynamics are included, is taken from the work of Skogestad and co-workers (1989a,b, 1990a,b). There are also two misconceptions in their paper that deserve comments.

Additional details