MODELING AND DESIGNING OF PH-CONTROLLED BISTABILITY, OSCILLATIONS, AND CHAOS IN A CONTINUOUS-FLOW STIRRED-TANK REACTOR

A model consisting of a protonation equilibrium and a hydrogen ion cat alyzed oxidation of the protonated species is suggested for the pH-reg ulated bistability observed frequently during oxidations of oxyanions (A(-)) under flow conditions: [GRAPHICS] Addition of a first order dec ay of hydrogen ion to the scheme results in a model of periodic oscill ations: [GRAPHICS] Chaotic solutions are obtained using appropriate pa rameters and favorable input concentrations if reaction (3) is chosen to be reversible and a new step for removal of CH is added: [GRAPHICS] The model provides the basis of a systematic approach for designing o pen chemical systems with nontrivial dynamical behavior such as bistab ility, periodic and chaotic oscillations.