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On‐line conversion monitoring of the solution polymerization of methyl methacrylate using near‐infrared spectroscopy
Author(s) -
Cherfi A.,
Févotte G.
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(200206)203:9<1188::aid-macp1188>3.0.co;2-n
Subject(s) - methyl methacrylate , calibration , polymerization , near infrared spectroscopy , analytical chemistry (journal) , spectroscopy , infrared spectroscopy , monomer , materials science , partial least squares regression , chemistry , optics , chromatography , polymer , organic chemistry , computer science , mathematics , quantum mechanics , physics , statistics , machine learning
Fiber‐optic near‐infrared (NIR) spectroscopy was successfully used to monitor the conversion of monomer during the solution polymerization of methyl methacrylate (MMA) carried out in a lab‐scale reactor. NIR spectra were recorded during 18 batch and semi‐continuous reactions using an in‐situ transmission probe. An empirical model was generated using partial least‐squares regression (PLS) to relate the NIR spectral data to the conversion measured off line by gravimetry. The obtained calibration was characterized by a correlation coefficient of 99.45% and a standard error of calibration (SEC) equal to 1.95%. The measurements were then validated for various operating conditions and for both batch and semi‐continuous modes. The conversion was measured with a standard error below 2.6%, in the worst case scenario. The on‐line NIR measurement of conversion was demonstrated to be accurate, robust, and suitable for versatile use in the polymerization plant.Validation of the on‐line measurement of MMA conversion during the semi‐continuous Runs V2 and V3.