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Using the perturbed-chain statistical associating fluid theory (PC-SAFT), the vapor pressure, saturated liquid density, and heat of vaporization for monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA) were calculated. PC-SAFT accurately described the properties of the pure ethanolamines along the coexistence curve. Then, the vapor−liquid equilibria (VLE) of the aqueous ethanolamine solutions were calculated by temperature-independent binary interaction parameters. Using the binary interaction parameters for the systems DEA + water, DEA + methanol, and methanol + water, the VLE of the ternary system DEA + water + methanol was predicted. The results indicated that PC-SAFT successfully described the equilibrium properties of the aqueous ethanolamine solutions. Finally, the solubilities of carbon dioxide and hydrogen sulfide in the aqueous ethanolamine solutions were predicted and compared to the experimental data. While no adjustable parameters were used, PC-SAFT reasonably described the solubility data.

This paper is a comparative study of 15 cubic equations of state (EoSs) for predicting natural gas dew points. Two-, three-, and four-parameter EoSs are used to predict the natural gas dew points. Natural gases contain a large amount of supercritical methane; therefore, the fugacity of methane, as a test of suitability of the EoSs, is predicted and compared to the recommended values in International Union of Pure and Applied Chemistry (IUPAC) tables. The vapor pressures of components that are normally present in natural gas mixtures, as another test of the suitability of the EoSs, are also predicted and compared with experimental data. The dew points of several natural gas mixtures then are predicted, using the EoSs, and compared to experimental values. Results reveal that the dew points of lean synthetic natural gases are predicted best by the Redlich-Kwong family of EoSs, whereas rich natural gases dew points are described significantly better by the Patel-Teja family of EoSs.

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