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On-Line NIR to Regulate Pervaporation Process: Application for Dehydration.

Thomas La Rocca1, Emilie Carretier2, Thomas Clair3

  • 1Aix-Marseille Université, CNRS, Centrale Marseille, M2P2 UMR 7340, Equipe Procédés Membranaires (EPM), Europôle de l'Arbois, BP80, Pavillon Laennec, Hall C, 13545 Aix-en-Provence CEDEX, France. thomas.LA-ROCCA@univ-amu.fr.

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Summary
This summary is machine-generated.

This study demonstrates on-line near-infrared (NIR) spectroscopy for monitoring volatile organic solvent regeneration via pervaporation. The method accurately tracks solvent mass fractions during dehydration, validating its efficiency and reproducibility.

Keywords:
HybSi® membraneon-line near-infrared spectroscopyorganic purificationpervaporation

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Area of Science:

  • Chemical Engineering
  • Analytical Chemistry

Background:

  • Volatile organic solvents (VOCs) require efficient regeneration for sustainable industrial processes.
  • Pervaporation is a key technology for solvent dehydration and recovery.

Purpose of the Study:

  • To evaluate the efficacy of on-line near-infrared (NIR) spectroscopy for monitoring VOC regeneration during pervaporation.
  • To assess the performance of a bis(triethoxysilyl)methane (BTESM)-based ceramic HybSi® membrane for solvent dehydration.

Main Methods:

  • Pervaporation experiments were conducted using a HybSi® membrane at 20, 30, and 40 °C.
  • On-line NIR spectroscopy was employed for continuous, non-sampling monitoring of solvent mass fractions.
  • Dehydration tests at 30 °C were performed to validate NIR reproducibility against an off-line densimeter.

Main Results:

  • On-line NIR spectroscopy provided continuous and rapid estimation of solvent mass fractions in the retentate.
  • The NIR method demonstrated excellent reproducibility, closely matching off-line densimeter results.
  • Average deviations between on-line NIR and off-line densimeter were within ±0.058 wt %, ±0.17 wt %, and ±0.049 wt % at 20, 30, and 40 °C, respectively.

Conclusions:

  • On-line NIR spectroscopy is a valuable tool for real-time monitoring of VOC regeneration processes.
  • The HybSi® membrane effectively performs solvent dehydration, with the NIR method proving reliable across various mass fractions and temperatures.