Densities, Excess Molar Volumes, Isothermal Compressibilities, and Isobaric Thermal Expansivities of the N-Methyldiethanolamine (1) + Water (2) System at Temperatures between (313 and 363) K an

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• 作者：Abel Zú ; ñ ; iga-Moreno ; Luis A. Galicia-Luna ; Jesus M. Bernal-Garc&iacute ; a ; Gustavo A. Iglesias-Silva
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2007
• 出版时间：September 2007
• 年：2007
• 卷：52
• 期：5
• 页码：1988 - 1995
• 全文大小：106K
• 年卷期：v.52,no.5(September 2007)
• ISSN：1520-5134

文摘

PT properties in the compressed liquid phase were measured for the system N-methyldiethanolamine (MDEA)(1) + water (2) at temperatures between (313 and 363) K and pressures up to 20 MPa. Densities of MDEA andfour gravimetrically prepared mixtures of MDEA (1) + water (2), at x₁ = 0.0369, 0.0607, 0.0893, and 0.1302,were determined using a vibrating tube densimeter. The classical calibration method of the vibrating tube densimeterwas used, using nitrogen and water as reference fluids. The uncertainty was estimated to be ± 0.2 kg·m^-3 for themeasured densities. The densities of each mixture and of MDEA were correlated using a volume explicit equationof six parameters. Isothermal compressibilities and isobaric thermal expansivities were calculated using the six-parameter equation with the correlated parameters obtained for MDEA and for the four mixtures. The uncertaintieson these properties were estimated to be ± 0.005 GPa^-1 and ± 5·10^-7 K^-1, respectively. Excess molar volumesfor the mixtures were determined using the measured densities of the mixture and MDEA volumes calculatedfrom the six-parameter equation and water volumes calculated from a multiparameter reference equation of state(EoS). The uncertainty in excess molar volumes was estimated to be ± 0.006 cm³·mol^-1.