A systematic investigation of plug-flow reactor (PFR)-separation-recycle systems where first-order exothermic and endothermic reactions are simultaneously performed is presented. The nonlinear behaviour is analyzed for two flowsheet alternatives and four plantwide control structures. It is shown that the system can exhibit a complex nonlinear behaviour. For the parameter values used, regions of unfeasibility, two or three multiple steady states and branches of isolated solutions were found. The undesired nonlinear phenomena can be avoided by fixing the reactor-inlet flow rates of each reactant or, when this is impossible due to the flowsheet structure, by providing sufficient cooling capacity. © 2008 Elsevier Ltd. All rights reserved.
Steady-state behaviour of PFR-separation-recycle systems with simultaneous exothermic and endothermic, first-order reactions / Steur, Klaas; S., Bildea Costin; Altimari, Pietro; C., Dimian Alexandre. - In: COMPUTERS & CHEMICAL ENGINEERING. - ISSN 0098-1354. - STAMPA. - 33:3(2009), pp. 628-635. [10.1016/j.compchemeng.2008.08.009]
Steady-state behaviour of PFR-separation-recycle systems with simultaneous exothermic and endothermic, first-order reactions
ALTIMARI, PIETRO;
2009
Abstract
A systematic investigation of plug-flow reactor (PFR)-separation-recycle systems where first-order exothermic and endothermic reactions are simultaneously performed is presented. The nonlinear behaviour is analyzed for two flowsheet alternatives and four plantwide control structures. It is shown that the system can exhibit a complex nonlinear behaviour. For the parameter values used, regions of unfeasibility, two or three multiple steady states and branches of isolated solutions were found. The undesired nonlinear phenomena can be avoided by fixing the reactor-inlet flow rates of each reactant or, when this is impossible due to the flowsheet structure, by providing sufficient cooling capacity. © 2008 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
