The protocol describes a method of predicting o-cresol concentration during the production of polyphenylene ether using near-infrared spectroscopy and partial least squares regression. To describe the process more clearly and completely, an example of predicting the o-cresol concentration during the production of polyphenylene is used to clarify the steps.
Chen, Z., Zheng, N., Luan, X., Liu, F. O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression. J. Vis. Exp. (153), e59077, doi:10.3791/59077 (2019).