Excess molar enthalpies of (carbon dioxide + ethene) in the liquid and near-critical regions

ISSN： 0021-9614

Source： Journal of Chemical Thermodynamics, Vol.33, Iss.7, 2001-07, pp. : 775-786

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Abstract

Flow calorimetric measurements of the excess molar enthalpyH_m^Efor {xCO₂ + (1 - x)C₂H₄} are described. The measurements cover the range T = 260.95 K to T = 315.75 K at pressures from 3.5 MPa to 12.6 MPa. Liquid phase measurements were made at the pressure 11.0 MPa over the range T = 260.95 toT = 300.45 K, and at pressures slightly greater than the saturation pressure of ethene or the critical pressure locus for the mixture. At x = 0.5 and at the four temperatures (285.85, 300.45, 306.25, and 315.75) K, excess enthalpy measurements were made over a range of pressures from 3.0 MPa to 12.6 MPa. The measurements at (285.85 and 300.45) K traverse the critical locus for the mixture, and those at (306.25 and 315.75) K are in the supercritical region. The measurements are compared with curves generated from the Patel–Teja equation of state, which does not quite fit the measurements but reproduces the main features of the observed behaviour.