November 2010

Columns

HP Viewpoint: Weighing on dual-temperature control

I’d like to weigh in again on the continuing debate regarding distillation column control.1–4 Attention has now turned to the practicality of “dual temperature” control,which is th..

Kern, A.G., Tesoro Corp.

I’d like to weigh in again on the continuing debate regarding distillation column control.1–4 Attention has now turned to the practicality of “dual temperature” control,which is the simultaneous control of temperature on both the overhead and bottoms of a distillation column, typically with top temperature cascaded to reflux flow and bottom temperature cascaded to reboiler heat input. My short answer agrees with Zak Friedman: Beware, all ye who wander here! Attempting dual-temperature control is most often undertaken by those oblivious to its perils. Industry is littered with its wreckage in the form of columns configured for dual-temperature control, but with one of the

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