Acrylamide inverse miniemulsion polymerization: in situ, real-time monitoring using nir spectroscopy

Brazilian Journal of Chemical Engineering. 2014;31(4):925-933 DOI 10.1590/0104-6632.20140314s00002719


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Journal Title: Brazilian Journal of Chemical Engineering

ISSN: 0104-6632 (Print); 1678-4383 (Online)

Publisher: Brazilian Society of Chemical Engineering

LCC Subject Category: Technology: Chemical technology: Chemical engineering

Country of publisher: Brazil

Language of fulltext: English

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M. M. E. Colmán (Universidade Federal de Santa Catarina)
D. L. Chicoma (Universidade Federal de Santa Catarina)
R. Giudici (Universidade Federal de Santa Catarina)
P. H. H. Araújo (Universidade Federal de Santa Catarina)
C. Sayer (Universidade Federal de Santa Catarina)


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Time From Submission to Publication: 12 weeks


Abstract | Full Text

In this work, the ability of on-line NIR spectroscopy for the prediction of the evolution of monomer concentration, conversion and average particle diameter in acrylamide inverse miniemulsion polymerization was evaluated. The spectral ranges were chosen as those representing the decrease in concentration of monomer. An increase in the baseline shift indicated that the NIR spectra were affected by particle size. Multivariate partial least squares calibration models were developed to relate NIR spectra collected by the immersion probe with off-line conversion and polymer particle size data. The results showed good agreement between off-line data and values predicted by the NIR calibration models and these latter were also able to detect different types of operational disturbances. These results indicate that it is possible to monitor variables of interest during acrylamide inverse miniemulsion polymerizations.