Excess molar enthalpies and excess molar volumes for the binary mixtures of 2-methylpropane, 2-methylpropene, and propan-2-ol at the temperatures (298.15 and 323.15) K and the pressures (5, 10, and 15) MPa

• Published in: The Journal of chemical thermodynamics Vol. 29; no. 2; pp. 179 - 195
• Main Authors: Moore, J.D., Brown, P.R., Ott, J.B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.1997; Elsevier
• Subjects: 2-methylpropane; 2-methylpropene; Chemical thermodynamics; Chemistry; Exact sciences and technology; excess enthalpies; excess volumes; General and physical chemistry; Mixtures; propan-2-ol; Thermodynamic properties; propan-2-ol; excess volumes; 2-methylpropane; 2-methylpropene; excess enthalpies; Isobutene; Molar volume; Enthalpy; Binary system; Hydrocarbons; Excess parameter; Secondary alcohol; Experimental study; Isobutane; Ethylenic compound; Organic compounds
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1006/jcht.1996.0147

Excess molar enthalpiesHmEand excess molar volumesVmEhave been determined for (2-methylpropane + 2-methylpropene). (2-methylpropane + propan-2-ol), and (2-methylpropene + propan-2-ol) at the temperatures (298.15 and 323.15) K and at the pressures (5, 10, and 15) MPa. For (alkane + alkene).HmEandVmEare small and positive for all values of mole fractionxof alkane, with small temperature and pressure coefficients. For (alkane + alkanol) and (alkene + alkanol), theHmEresults and the oaks molar heat capacityCp,mEare large and positive, whileVmE(x) is s-shaped, changing from negative to positive with increasing mole fraction of the hydrocarbon. Pressure has a small effect onHmEfor these systems, but affectsVmEby decreasing the magnitudes of the positive and negative regions of the s-shaped curves and shifting the intersection with the abscissa (VmE= 0) to lower mole fraction of the alkane or alkene with increasing pressure. Comparisons are made among the three systems of the effect of the hydroxyl group and the double bond onHmE(x) andVmE(x). These systems are also compared with (n-alkane +n-alkanol) of similar molar masses.