Experimental Study Into Carbon Dioxide
Solubility And Species Distribution In Aqueous
Alkanolamine Solutions
Author(s)
H. Yamada, T. Higashii, F. A. Chowdhury, K. Goto & S. Kazama
Abstract
We investigated the solubility of CO2 in aqueous solutions of alkanolamines at
40C and 120C over CO2 partial pressures ranging from a few kPa to 100 kPa to
evaluate the potential for CO2 capture from flue gas. CO2 capacities were
compared between monoethanolamine, N-ethyl ethanolamine and N-isopropyl
ethanolamine. Speciation analyses were conducted in the alkanolamine solutions
at different CO2 loadings by accurate quantitative 13C nuclear magnetic
resonance spectroscopy. N-isopropyl ethanolamine showed a large capacity for
CO2 because of the formation of bicarbonate. However, we also found that at a
lower CO2 loading a significant amount of carbamate was present in the aqueous
N-isopropyl ethanolamine solutions.
Keywords: carbon capture, amine absorbent, CO2 solubility, vapour-liquid
equilibrium, nuclear magnetic resonance.
1 Introduction
Carbon capture and storage is of central importance for the reduction of
anthropogenic CO2 emissions in the atmosphere. Amine scrubbing is the most
promising and currently applicable technology used in an industrial scale for the
capture of CO2 from a gas stream [1]. To maximise the capture efficiency and to
reduce energy costs we previously developed CO2 capture systems and high
performance CO2 absorbents [2–5]. Recently, we demonstrated that hindered
amino alcohols for the promotion of CO2 capture can be developed by rational
molecular design and by the placement of functional groups [4, 5].
For aqueous solutions of primary and secondary amines the CO2 absorption
proceeds by the formation of a carbamate anion or a bicarbonate anion. It is well
Keywords
carbon capture, amine absorbent, CO2 solubility, vapour-liquid
equilibrium, nuclear magnetic resonance.
Related Book
Other papers in this volume
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