Model of vapor-liquid equilibria in the aqueous acid gas - alkanolamine system using the electrolyte - NRTL equation

David M. Austgen, Gary T. Rochelle, Xiao Peng, Chau Chyun Chen

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Abstract

A thermodynamically-consistent model is developed for representing vapor-liquid equilibia in the aci gas (H2S, CO2)-alkanolamine-water system. The model accounts for chemical equilibria in a rigorous manner. Activity coefficients are represented with the Electrolyte-NRTL equation treating both long-range ion-ion interactions and local interactions between all true liquid phase species. Both water and alkanolamine are treated as solvents. Adjustable parameters of the Electrolyte-NRTL equation, representing short-range binary interactions, are fitted on binary and ternary system VLE data. Calculated H2S and CO2 equilibria are in good agreement with most of the reported experimental data for aqueous solutions of a single acid gas in monoethanolamine (MEA) and diethanolamine (DEA) in the temperature range 25-120°C. Without fitting additional parameters representation of experimental equilibria for mixtures of H2S and CO2 in aqueous solutions of MEA and DEA is good.

Original languageEnglish
Pages69B 44p
StatePublished - 1988
EventPreprint - American Institute of Chemical Engineers - New Orleans, LA, USA
Duration: Mar 6 1988Mar 10 1988

Conference

ConferencePreprint - American Institute of Chemical Engineers
CityNew Orleans, LA, USA
Period03/6/8803/10/88

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    Austgen, D. M., Rochelle, G. T., Peng, X., & Chen, C. C. (1988). Model of vapor-liquid equilibria in the aqueous acid gas - alkanolamine system using the electrolyte - NRTL equation. 69B 44p. Paper presented at Preprint - American Institute of Chemical Engineers, New Orleans, LA, USA, .