Thermodynamics based stability analysis and its use for nonlinear stabilization of the CSTR.

N.H. Hoang (1) , Françoise Couenne (2) , Christian Jallut (2) , Yann Le Gorrec (3)

1 Faculty of Chemical Engineering [Vietnam National University, HCM]
2 LAGEP - Laboratoire d'automatique et de génie des procédés
3 FEMTO-ST - Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174)

We show how the availability function as defined from the entropy function concavity can be used for the stability analysis and derivation of control strategies for nonisothermal Continuous Stirred Tank Reactors (CSTRs). We first propose an overview of the required thermodynamic concepts. Then, we show how the availability function restricted to the thermal domain can be used as a Lyapunov function. The derivation of the control law and the way the strict entropy concavity is insured are discussed. Numerical simulations illustrate the application of the theory to the open loop stability analysis and the closed loop control of liquid-phase non-isothermal CSTRs. The proposed approach is compared with the classical proportional control strategy. Two chemical reactions are studied: the acid-catalyzed hydration of 2-3-epoxy-1-propanol to glycerol subject to steady state multiplicity and the production of cyclopentenol from cyclopentadiene by acid-catalyzed electrophilic addition of water in dilute solution exhibiting a non-minimum phase behavior.

Domaines: Génie des procédés; Génie chimique; Automatique; Automatique / Robotique

N.H. Hoang, Françoise Couenne, Christian Jallut, Yann Le Gorrec. Thermodynamics based stability analysis and its use for nonlinear stabilization of the CSTR.. Computers & Chemical Engineering, 2013, 58, pp.156-177. ⟨10.1016/j.compchemeng.2013.06.016⟩. ⟨hal-00876537⟩