Modeling of carbon dioxide absorption by aqueous ammonia solutions using the Extended UNIQUAC model

Victor Camille Alfred Darde, Willy J. M. van Well, Erling Halfdan Stenby, Kaj Thomsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An upgraded version of the Extended UNIQUAC thermodynamic model for the carbon dioxide-ammonia-water system has been developed, based on the original version proposed by Thomsen and Rasmussen. The original model was valid in the temperature range 0-110°C, the pressure range 0-10 MPa and the concentration range up to 80 molal ammonia. In this work, the validity of this model was extended up to 150°C and the accuracy improved by increasing the number of experimental data points from 2000 to more than 3500. These experimental data consisting of vapor-liquid equilibrium data in various concentration ranges, enthalpy change from partial evaporation measurements, speciation data, heat capacity, enthalpy of solution and enthalpy of dilution data have been used to refit 43 model parameters and standard state properties. Henry’s law constant correlations have been used for extrapolating standard state properties of carbon dioxide and ammonia to supercritical conditions.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Volume49
Issue number24
Pages (from-to)12663-12674
ISSN0888-5885
DOIs
Publication statusPublished - 2010

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