A NOTE ON CONCENTRATION CONTROL IN GRADIENTLESS RECYCLE REACTORS

Controlled adjustment of gas concentrations in laboratory recycle reac tors, highly desirable to support kinetic studies on solid catalysts, seems often difficult to accomplish. Main obstacles are large time del ays, strong loop interactions, and of course incomplete knowledge abou t the kinetics of the reaction system under investigation. To cope wit h such difficulties, a simple recursive I-control algorithm has been d eveloped on the basis of a general control concept proposed some fifte en years ago. Simulation studies indicate good performance of this alg orithm and robustness to uncertainties of model parameters.