Instability of CSTR due to Chemical Chaos.

本项目的目的是阐明B-Z反应化学振荡分岔与CSTR操作不稳定性的关系。Fe^2+-Fe^3+体系和Ce^3+-Ce ^4+体系用作金属催化剂。停留时间T主要作为分岔参数变化。所用CSTR的体积容量为30 ml。当T足够大时，由于化学平衡，不会出现化学振荡。另一方面，由于全混流反应器的动态平衡，没有发生任何振荡。在T = 21.7 min时，出现两种不同振幅的混合振荡。在T = 21.4 min时，确实出现化学混沌。当T = 16.0min时，又出现了单峰周期振荡，在相空间中具有极限环的特性。在T7.75min时，出现规则的振荡，在相空间中具有8字形吸引子.振荡的时间周期倾向于随着停留时间的减少而延长。随着溴离子进料浓度的增加和丙二酸进料浓度的降低，反应的时间和振幅有增加的趋势。

The objective of this project is to elucidate the mechanism for the bifurcation of chemical oscillations of B-Z reaction in relation with the instability of CSTR operation. Fe^<2+>-Fe^<3+> system as well as Ce^<3+>-Ce ^<4+> system are used as the metal catalyst. The residence time T was varied mainly as the bifurcation parameter. The volumetric capacity of the CSTR used is 30 ml. When T is sufficiently large, there do not appear any chemical oscillations owing to chemical equilibrium. On the other hand, there do not occur any oscillations owing to dynamical equilibrium of CSTR. At T = 21.7 min, there appear mixed oscillations with two different amplitudes. At T = 21.4 min, there does appear chemical chaos. At T = 16.0 min, however, there appear single-peak periodic oscillations again, which have a limit cycle trajectrory in phase space. At T 7.75 min, there appear regular oscillations, which have 8-shaped attractor in phase space. The time period of the oscillations tends to be lengthened with decreasing the residence time. The time period and amplitude tend to increase with increasing the feed concentration of bromide ion and with decreasing the feed concentration of malonic acid.