The excess enthalpies of (carbon dioxide+hexane) at 308.15, 358.15, and 413.15 K from 7.50 to 12.50 MPa

• Published in: The Journal of chemical thermodynamics 1984-01, Vol.16 (5), p.445-451
• Main Authors: Christensen, J.J., Walker, T.A.C., Schofield, R.S., Faux, P.W., Harding, P.R., Izatt, R.M.
• Format: Article
• Language: English
• Subjects: Chemical thermodynamics; Chemistry; Exact sciences and technology; General and physical chemistry; Metals and alloys; Mixtures; Thermodynamic properties
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/0021-9614(84)90201-5

The excess molar enthalpies H m E for ×CO 2+(1−x)C 6H 14} were measured in the vicinity of their critical locus and in the supercritical region. Mixtures at 308.15 K and at 7.50 MPa show very exothermic mixing and a region where H m E varies linearly with mole fraction x while at 10.50 and 12.50 MPa they show only moderately endothermic mixing. Mixtures at 358.15 K and 413.15 K and at all pressures studied except for 358.15 K and 12.50 MPa have an exothermic section in the hexane-rich region, a linear section which starts at a mole fraction x corresponding very closely to that of the minimum value of H m E, and an endothermic section in the carbon-dioxide-rich region. The H m E values are very similar to those for { xCO 2+(1− x) c-C 6H 12} previously measured at the same temperatures and pressures.