Enthalpies of absorption of carbon dioxide in aqueous methyldiethanolamine solutions

An isothermal flow calorimeter was used to measure the enthalpies of absorption of carbon dioxide in aqueous 20, 40, and 60 wt.% methyldiethanolamine (MDEA) solutions. The experimental temperature and pressure ranges were 288.71 to 422.04 K and 156 to 1466 kPa, respectively. The experimental equipme...

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Bibliographic Details
Published in:Thermochimica acta 1987-11, Vol.121, p.437-446
Main Authors: Merkley, K.E., Christensen, J.J., Izatt, R.M.
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Elements, mineral and organic compounds
Exact sciences and technology
General and physical chemistry
General. Theory
Metals and alloys
Mixtures
Thermodynamic properties
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Summary:An isothermal flow calorimeter was used to measure the enthalpies of absorption of carbon dioxide in aqueous 20, 40, and 60 wt.% methyldiethanolamine (MDEA) solutions. The experimental temperature and pressure ranges were 288.71 to 422.04 K and 156 to 1466 kPa, respectively. The experimental equipment and procedure are described, with emphasis on the complexities originating from the difficulty of measuring the enthalpy of absorption of a gas in an aqueous solution. The calorimetric data were also found to be useful in determining the equilibrium concentrations of CO 2in the MDEA solutions. Both enthalpy of absorption and equilibrium concentration data for CO 2-aqueous MDEA systems are reported and compared with existing values from other investigations. The enthalpy of absorption of CO 2 in aqueous MDEA solutions was found to be independent of pressure and linearly dependent upon both the temperature and the MDEA concentration. An equation is given for predicting the enthalpy of absorption over the ranges of temperatures, pressures, and concentrations investigated.
ISSN:0040-6031
1872-762X
DOI:10.1016/0040-6031(87)80191-0