Enhancing the Performance of Spontaneously Oscillatory Chemical Reactions

Abstract

Oscillations are often deemed undesirable when chemical reactions are carried out in practice because they tend to give rise to operational complexities. It is demonstrated that such oscillations need not always be avoided. In fact, the yield of the desired product from an autocatalytic reaction in a continuous stirred-tank reactor can be, at least, quadrupled.

Onset and Synchronization of Complex Dynamic Behavior in the Light-Sensitive Belousov−Zhabotinsky Reaction with Periodic and Nearly Periodic Switching

“…Our method for suppressing chaos by allowing variation in the switching times is much simpler to implement. This constructive influence of noise may be advantageous for industrial production, where time-varying control parameters may enhance both the production rate and the selectivity of the reaction. − …”

“…Chemical reactions driven with a periodic perturbation have been the subject of many experimental and computational studies in the past 30 years. − In particular, the potential for increasing yields of chemical reactions by periodic perturbations has drawn significant attention from chemical engineers. − Substantial improvement in overall yield has been predicted in modeling studies, , and the possibility of increased selectivity among a range of reaction products has also been examined. ,,,− A number of studies on periodically driven chemical reactions have reported the observation of entrainment and consecutive bifurcations leading to chaos. − Entrainment occurs when a periodic perturbation of sufficiently large amplitude is applied to a self-oscillating system and the frequency of the oscillating system is synchronized by the frequency of the driving signal. Outside the entrainment regions one may find quasiperiodic oscillations that show a countable number of periodic oscillations. , …”

Increasing the reactant conversion through induced oscillations in a continuous stirred tank reactor by using PI control

“…In this section, the conditions to obtain induced oscillations through the PI 1 and PI 2 controllers are researched (simplified models in which the self-oscillations are used to improve the performance of different kind of reactors can be found in Refs [23][24][25][26]). …”

Transient complex oscillations in a closed chemical system with coupled autocatalysis

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] For example, Aris and co-workers studied responses of several reactors models to periodic forcing and observed that for small and intermediate forcing amplitudes, the responses were organized around several common patterns such as the interplay between quasiperiodicity and entrainment. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] For example, Aris and co-workers studied responses of several reactors models to periodic forcing and observed that for small and intermediate forcing amplitudes, the responses were organized around several common patterns such as the interplay between quasiperiodicity and entrainment.…”

“…3,4 Recent computational investigations of the photosensitive BZ reaction illustrated that not only were the forcing frequency and amplitude important, but the detailed wave form of the external forcing was also essential in determining the behavior of a driven dynamical system. [6][7][8] Besides those well-designed, externally controlled perturbation protocols, perturbed dynamical systems may also be constructed via coupling different reaction processes, in which variations of the "applied" perturbation are exclusively determined by the mixed system itself. [6][7][8] Besides those well-designed, externally controlled perturbation protocols, perturbed dynamical systems may also be constructed via coupling different reaction processes, in which variations of the "applied" perturbation are exclusively determined by the mixed system itself.…”