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NMR-based carbamate decomposition constants of linear primary alkanolamines for CO2 capture

Abstract

The amine carbamate related equilibrium (RNHCOO– + H2O ⇆ RNH2 + HCO3–) has been investigated with 13C NMR (Nuclear Magnetic Resonance) spectroscopy for a series of linear primary alkanolamines, and the apparent carbamate decomposition equilibrium constants have been estimated. A quantitative NMR method for the calculation of the concentration of the species formed in solution has been provided, including the assessment of each of the fast exchanging proton species (whose nuclei resonate at the same chemical shifts in the NMR spectra). For this purpose, NMR-based calibration curves were utilized and an alternative method was applied for validation. The overall results showed that the amount of carbamate found at the equilibrium decreased as the length of the carbon chain increased, while the corresponding apparent carbamate decomposition equilibrium constants featured the same order of magnitude (10–2).

Category

Academic article

Client

  • Research Council of Norway (RCN) / 199890

Language

English

Author(s)

  • Cristina Perinu
  • Bjørnar Arstad
  • Aud Mjærum Bouzga
  • John Arild Svendsen
  • Klaus-Joachim Jens

Affiliation

  • University of South-Eastern Norway
  • SINTEF Industry / Process Technology

Year

2014

Published in

Industrial & Engineering Chemistry Research

ISSN

0888-5885

Publisher

American Chemical Society (ACS)

Volume

53

Issue

38

Page(s)

14571 - 14578

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