Control production of polyester resins by NIR spectroscopy

M. Blanco, J. Cruz, M. Armengol

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11 Citations (Scopus)


The control of the esterification reaction for production of polyester saturated resins is followed usually by determination of the acid value (AV) and hydroxyl value (OHV).These parameters are determined by titrimetry, but these methods are slow, intensity working and produce waste. In this paper an alternative methodology is proposed, based in the construction of multivariate models on NIR spectroscopic data and different models are constructed in order to apply to different steps of the production process. The ensuing methodology provides models of good predictive ability and constitute an advantageous alternative to existing titrimetric reference methods as regards expeditiousness and environmentally compatible. The multivariate calibration models established were also used with a different instrument; to this end, the spectra recorded with the original equipment were subjected to Piecewise Direct Standardization (PDS) in order to make them equivalent to those provided by the new equipment. Also, PLS calibration was reproduced by using the same samples, spectral treatment, wavenumber range and number of factors as in the original model, and the AV and OHV results thus obtained were similarly good. © 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)118-123
JournalMicrochemical Journal
Issue number2
Publication statusPublished - 1 Dec 2008


  • Acid value
  • Hydroxyl value
  • Model transfer
  • Multivariate calibration
  • NIR spectroscopy
  • PLSR


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