Solubility of Carbon Dioxide and Hydrogen Sulfide in Aqueous N-Methyldiethanolamine Solutions

P. J. G. Huttenhuis*, N. J. Agrawal, G. F. Versteeg

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

29 Citaten (Scopus)
32 Downloads (Pure)


In this work, 72 new experimental solubility data points for H(2)S and CO(2) mixtures in aqueous N-methyldiethanol amine (MDEA) solutions at different methane partial pressures (up to 69 bara) are presented. They are correlated using an electrolyte equation of state (E-EOS) thermodynamic model. This model has already been used to estimate the CO(2) solubility in aqueous MDEA (Huttenhuis et al. Fluid Phase Equilib. 2008, 264, 99-112) and the H(2)S solubility in aqueous MDEA (Huttenhuis et al. Int. J. Oil, Gas Coal Technol. 2008, 1, 399-424). Here, the model is further extended to predict the behavior of CO(2) and H(2)S when they are present simultaneously in aqueous MDEA. The application of an equation of state is a new development for this type of system, i.e., of acid-gas-amine systems. The molecular interactions are described by Schwarzentruber et al.'s modification of the Redlich-Kwong-Soave equation of state, with terms added to account for ionic interactions in the liquid phase. The model is used to describe acid-gas solubility data for the CO(2)-H(2)S-MDEA-H(2)O system reported in the open literature and experimental data reported here for the CO(2)-H(2)S-MDEA-H(2)O-CH(4) system.

Originele taal-2English
Pagina's (van-tot)4051-4059
Aantal pagina's9
TijdschriftIndustrial and Engineering Chemistry Research
Nummer van het tijdschrift8
StatusPublished - 15-apr.-2009

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