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Excess molar enthalpies of six (carbon dioxide + a polar solvent) mixtures at the temperatures 298.15 K and 308.15 K and pressures from 7.5 MPa to 12.6 MPa

✍ Scribed by Raul A. Hauser; Jian Ping Zhao; Peter R. Tremaine; Alan E. Mather

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 227 KB
Volume: 28
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1996.0115

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✦ Synopsis

The excess molar enthalpies H E m of five binary mixtures: (carbon dioxide + methanol, or ethanol, or N-methyl-2-pyrrolidone, or methyl cyanoacetate, or N-formyl morpholine), and one ternary mixture: [xCO2 + (1x){0.8085(CH2)4SO2 + 0.1915H2O}] were measured at the temperature T = 298.15 K and pressures near (7.5, 10.0, and 12.5) MPa. Values for H E m of {xCO2 + (1x)C2H5OH} and [xCO2 + (1x){0.8085(CH2)4SO2 + 0.1915H2O}] were also measured at T = 308.15 K and the pressures (7.5, 10.0, and 12.5) MPa. Values of H E m {xCO2 + (1x)(CH3OH or C2H5OH)} were negative for x Q 0.8 and positive at higher x . The H E m values for the other mixtures were negative at all compositions studied. Large negative values of H E m were observed at T = 303.15 K and p = 7.5 MPa, consistent with the proximity to the critical temperature and pressure of carbon dioxide. (Vapour + liquid) phase boundaries were determined from the H E m values for [xCO2 + (1x){0.8085(CH2)4SO2 + 0.1915H2O}].

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