Thermodynamics of branched alcohols

作者: U. Domańska , J.A. González

DOI: 10.1016/S0378-3812(98)00236-2

关键词: Melting pointThermodynamicsEutectic systemEnthalpyHydrocarbonChemistryGroup contribution methodAlkaneBinary systemAlcohol

摘要: Abstract Solid–liquid equilibrium temperatures for tert-butanol+n-alkanes (C18, C19, C20, C21, C22, C23, C24, C25, C26, C28) systems have been measured by a dynamic method from 298.15 K to the melting point of alkane. All present an eutectic at very low concentration alcohol. A first-order transition was observed many n-alkanes considered. The experimental values are compared with those given DISQUAC model using interaction parameters previously determined on basis vapor–liquid equilibria, VLE, and molar excess enthalpies, HE, containing lower (n-C6, n-C7). Calculations were developed taking into account solid–solid alkanes. mean relative standard deviation is 0.0073. Differences between data calculated results SLE HE analysed in terms Patterson effect. possibility improving predictions modifying only third dispersive interchange coefficient discussed. Two this parameter proposed depending n, hereafter number C atoms n-alkane (n≤8 n≥9). In way, variation temperature better represented including longer n-alkanes. Predictions remain unchanged, because they depend essentially first coefficients when range considered, as case, rather narrow.

参考文章(51)
Edmundo Gomes de Azevedo, J. M. Prausnitz, Ruediger N. Lichtenthaler, Molecular Thermodynamics of Fluid-Phase Equilibria ,(1969)
Zofia Plesnar, Paweł Gierycz, Andrzej Bylicki, (Solid + liquid) equilibria in (butan-1-ol + n-decane or n-octane) The Journal of Chemical Thermodynamics. ,vol. 22, pp. 403- 406 ,(1990) , 10.1016/0021-9614(90)90128-D
A. Ksiazczak, K. Moorthi, I. Nagata, Solid-solid transition and solubility of even n-alkanes Fluid Phase Equilibria. ,vol. 95, pp. 15- 29 ,(1994) , 10.1016/0378-3812(94)80058-8
S. Dernini, R. De Santis, Solubility of solid hexadecane and tetracosane in hexane Canadian Journal of Chemical Engineering. ,vol. 54, pp. 369- 370 ,(1976) , 10.1002/CJCE.5450540421
H.V. Kehiaian, Group contribution methods for liquid mixtures: A critical review Fluid Phase Equilibria. ,vol. 13, pp. 243- 252 ,(1983) , 10.1016/0378-3812(83)80098-3
M.J.M. van Oort, M.A. White, A Linear Entropy Relationship for Fusion of N-Alkyl Chains Thermochimica Acta. ,vol. 86, pp. 1- 6 ,(1985) , 10.1016/0040-6031(85)87027-1
Gérard Maffiolo, Jean Vidal, Henri Renon, Cohesive energy of liquid hydrocarbons Industrial & Engineering Chemistry Fundamentals. ,vol. 11, pp. 100- 105 ,(1972) , 10.1021/I160041A015
U. Domanska, D. Wyrzykowska-Stankiewicz, Enthalpies of fusion and solid-solid transition of even-numbered paraffins C22H46, C24H50, C26H54 and C28H58 Thermochimica Acta. ,vol. 179, pp. 265- 271 ,(1991) , 10.1016/0040-6031(91)80356-N