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Quantitative on-line high-resolution NMR spectroscopy in process engineering applications.

Michael Maiwald1, Holger H Fischer, Young-Kyu Kim

  • 1Institute of Thermodynamics and Thermal Process Engineering, University of Stuttgart, Pfaffenwaldring 9, 70550, Stuttgart, Germany.

Analytical and Bioanalytical Chemistry
|May 7, 2003
PubMed
Summary

High-resolution NMR spectroscopy enables on-line analysis of complex mixtures in industrial processes. This method provides quantitative insights into chemical equilibria and reaction kinetics, crucial for process optimization.

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Area of Science:

  • Analytical Chemistry
  • Chemical Engineering
  • Spectroscopy

Background:

  • Complex multicomponent mixtures are common in industrial processes like reactions and separations.
  • High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful technique for analyzing these mixtures.
  • On-line NMR probes allow for real-time studies under diverse process conditions (temperature, pressure).

Purpose of the Study:

  • To demonstrate the quantitative application of on-line NMR spectroscopy in process engineering.
  • To address challenges in on-line NMR, including quantitative evaluation, parameter optimization, and the use of non-deuterated solvents.
  • To present case studies of on-line NMR in technically relevant systems.

Main Methods:

  • Utilizing flow NMR probes for on-line analysis under process conditions.

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  • Optimizing experimental parameters such as flow rates and recovery times for quantitative accuracy.
  • Implementing techniques for field homogenization and solvent signal suppression, essential when non-deuterated solvents are used.

    • Main Results:

    • Successfully applied on-line NMR to study chemical equilibria and reaction kinetics in the formaldehyde-water-methanol system.
    • Investigated the reactive gas absorption of carbon dioxide (CO2) in aqueous monoethanolamine solutions using on-line NMR.
    • Demonstrated the feasibility of quantitative analysis in complex industrial mixtures.

    Conclusions:

    • On-line NMR spectroscopy is a viable and powerful tool for in-situ monitoring and quantitative analysis of complex multicomponent mixtures in process engineering.
    • The presented methods overcome key challenges, enabling broader application of NMR in industrial settings.
    • This technique offers valuable insights for optimizing chemical processes and understanding reaction dynamics.