Nonlinear high ga in observers for a Semi Continuous stirred tank reactor

In this paper, two versions of nonlinear high gain observer are developed to reconstruct the full state of an olive oil waste esterification process. This operation is taking place in a Semi Continuous stirred Tank Reactor (SCSTR). The plant model, is one of the most important plants in chemical processes, presents a high level of non linearities and interconnections between states. We will show the necessary steps required to move from differential algebraic model to a differential model. We show in this work that it is possible to synthesis a two versions of high gain observer for a multi input multi output system and ensure good applicability of a such observer. The results are validated on a real measurements of the plant. The second part is devoted to performances´ comparison between there.