Control
strategy is crucial for the smooth operation of distillation
systems, especially when the design flowsheet is complicated. In this
work, a control strategy is proposed for a recently published heterogeneous
extractive distillation system separating cyclohexane and cyclohexene.
During the investigation of control strategy, a closed-loop sensitivity
test is adopted to analyze the controllability of this distillation
system, and the results show that some modifications for the steady-state
design must be made to facilitate the implementation of suitable control
structure. After redesigning the separation process, closed-loop sensitivity
test is again performed for the purpose of successfully setting up
a single-temperature control scheme for two distillation columns and
also determine which variable/ratio is to be fixed. The results of
open-loop and closed-loop sensitivity tests are taken into consideration
together for the sake of selecting the appropriate stage for temperature
control. In addition, a closed-loop sensitivity test is also used
for the preinvestigation of throughput disturbance rejection to devise
feedforward control action. According to the closed-loop dynamic responses,
the proposed control strategy enables the heterogeneous extractive
distillation system to properly reject ±20% feed composition
disturbances and ±10% throughput changes.
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