Determination of transesterification reaction endpoint using NIR spectroscopy

Wayne D. Mockel; Mark P. Thomas

doi:10.1117/12.137739

14 August 1992 Determination of transesterification reaction endpoint using NIR spectroscopy

Wayne D. Mockel, Mark P. Thomas

Proceedings Volume 1681, Optically Based Methods for Process Analysis; (1992) https://doi.org/10.1117/12.137739
Event: SPIE's 1992 Symposium on Process Control and Monitoring, 1992, Somerset, NJ, United States

Abstract

An analytical method based on fiber optic near infrared spectroscopy (NIR) and partial least squares data analysis (PLS) was developed to monitor a reaction in which a methyl ester is transesterified with polyethylene glycol 300 (PEG 300) to give the corresponding PEG 300 ester and methanol. A series of multivariant modeling techniques which predict the transesterification reaction end point by monitoring the PEG 300 content were evaluated. The models were developed by making a series of transesterification reactions, collecting grab samples, analyzing them by using the NIR spectrophotometer and liquid chromatography (HPLC) to construct a training and validation set consisting of 50 data points. The models were evaluated in the laboratory setting and the PLS model was used in a pilot plant to predict the reaction end point. Use of the NIR modeling system in the pilot plant led to reduced reaction times and a concomitant rise in product quality. A purged NEMA enclosure was manufactured and was used to house the NIR instrumentation in the pilot plant setting.

Citation Download Citation

Wayne D. Mockel and Mark P. Thomas "Determination of transesterification reaction endpoint using NIR spectroscopy", Proc. SPIE 1681, Optically Based Methods for Process Analysis, (14 August 1992); https://doi.org/10.1117/12.137739

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