There is a good agreement between the experimental data and the corresponding calculated values. The lines were calculated with the Extended UNIQUAC model. The experimental data were measured by Ute Lichtfers and published in her PhD Dissertation, University of Kaiserslautern, Germany, 2000. The amounts of NH 3, NH 4 +, and NH 2COO – are shown in the figure to the left, the amounts of CO 2, CO 3 2-, and HCO 3 – in the same solution are shown to the right. The amount of carbamate formed is indicated in the figure to the left with red triangles (experimental) and a red line (calculated with the Extended UNIQUAC model). The figures show the experimentally measured and the calculated speciation in a 6.226 molal NH 3 solution at 40☌. Stenby, Kaj Thomsen, “Modeling of carbon dioxide absorption by aqueous ammonia solutions using the Extended UNIQUAC model”, Ind. An upgraded version of this model valid to higher temperatures and more accurate was published by Victor Darde, Willy J.M. (Thomsen K and Rasmussen P, “Modeling of Vapor-liquid-solid equilibrium in gas-aqueous electrolyte systems”, Chemical Engineering Science, 54(1999)1787-1802. The CO 2 – NH 3 – H 2O system was modeled with the Extended UNIQUAC model.
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