Controllability of semibatch nonisothermal antisolvent crystallization processes

Document Type

Article

Publication Date

4-30-2014

Abstract

In this article the problems of input multiplicities arising in the nonisothermal crystallization process is first considered. Using controllability tools it was found that the system, along a certain trajectory is ill conditioned. Furthermore, the singularity loci of the gain matrix, calculated at asymptotic condition, were obtained. The ill-conditioned nature of the corresponding control problem may imply limitations and affect the responsiveness of the system, and thus the design of a proper control strategy is also addressed in this paper. The proposed control strategy consists of two-stages. In the first stage a feedforward control is used, where the antisolvent flow rate and temperature trajectories are the results of a static optimization procedure. At the second stage, a feedback control action is introduced, and it is used to eliminate the possible offsets due to modeling errors. Results are illustrated for the simulated NaCl-water-ethanol antisolvent crystallization system. © 2014 American Chemical Society.

Publication Source (Journal or Book title)

Industrial and Engineering Chemistry Research

First Page

7056

Last Page

7065

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