New dynamical observer for a batch crystallization process based on solute concentration

Lucas Brivadis (1) , Vincent Andrieu (1) , Elodie Chabanon (1) , Emilie Gagniere (1) , Noureddine Lebaz (1) , Ulysse Serres (1)

1 LAGEPP - Laboratoire d'automatique, de génie des procédés et de génie pharmaceutique

In this paper a new observer is introduced to estimate the Crystal Size Distribution (CSD) only from the measurements of the solute concentration, temperature and a model of the growth rate. No model of the nucleation rate is needed. This approach is based on the use of a Kazantzis-Kravaris/Luenberger observer which exponentially estimates functionals of the CSD. Then, the full state is estimated by means of a Tikhonov regularization procedure. Numerical simulations are provided. Our approach relies on an infinite-dimensional observer, contrarily to the usual moment based observers.

Mots clés: Solute concentration; Tikhonov regularization; Crystal Size Distribution; Observers; Crystallization

Domaines: Automatique / Robotique; Génie des procédés; Optimisation et contrôle [math.OC]

Lucas Brivadis, Vincent Andrieu, Elodie Chabanon, Emilie Gagniere, Noureddine Lebaz, et al.. New dynamical observer for a batch crystallization process based on solute concentration. Journal of Process Control, 2020, 87, pp.17-26. ⟨10.1016/j.jprocont.2019.12.012⟩. ⟨hal-02448635⟩