Spectroscopic monitoring of batch reactions for on-line fault detection and diagnosis
This paper presents the general methodology to use spectroscopic measurements directly for on-line process monitoring and detection and diagnosis of disturbances. An application of the on-line monitoring of a chemical batch reaction using UV-visible spectroscopy is discussed in detail. Successful historical batches are used to build a statistical model of the batch reaction. The model uses external information such as the pure spectra of the compounds and their concentration profiles to improve the interpretability. Control charts are developed for on-line monitoring of new batches. It is shown that this model is capable of detecting erroneous batches. In combination with contribution plots, the actual cause of the disturbances can be diagnosed.
Westerhuis
JA
Department of Chemical Engineering, University of Amsterdam, The Netherlands.
Gurden
SP
Smilde
AK