Facile Method for Determination
of Amine Speciation
in CO<sub>2</sub> Capture Solutions
- Publication date
- Publisher
Abstract
A simple and quantitatively reliable method for determination
of
amine speciation is introduced. The method employs three experimental
methods that should be readily accessible. The results for CO<sub>2</sub> loaded aqueous solutions of 30 wt % monoethanolamine (MEA)
are used for demonstration of the method and show promising agreement
with the more complicated spectroscopic methods reported in the literature.
The measurements were done at ambient temperature and atmospheric
pressure, since theoretical calculations and experimental data from
the open literature revealed no considerable difference in speciation
at different temperatures. The procedure is based on acid and base
titration of the CO<sub>2</sub> loaded amine solution along with the
determination of total CO<sub>2</sub> loading. The quantitative results
for the different species concentration in the example MEA solution
is in agreement with other available spectroscopic methods, mainly
NMR, particularly for the free amine, carbamate, and protonated amine
concentrations. Aspen Plus was also used for further assessment of
the experimental data
