P Pérez

HmE and VmE of some (butanone or dipropylether + an alkanol) mixtures

Abstract Molar excess enthalpies and volumes of (butanone or dipropylether + alkanol) at 298.15 K (in some cases at 308.15 K, too) were measured. The different behaviour observed in each non-alkanol component is put down for the most part to an unlike dipolar contribution. Mixtures containing 2-methylpropan-2-ol deviate from the systematic behaviour of those with n -alkan-1-ols.

HmE, VmE, and GmE of {xCl2HCCHCl2 + (1 − x)C6H14} at several temperatures

Excess molar enthalpies, excess molar volumes, and vapour pressures of (1,1,2,2-tetrachloroethane + n-hexane) between 288.15 and 318.15 K (298.15 to 308.15 K for the vapour pressures) were determined. Activity coefficients and excess molar Gibbs free energies were calculated by Barkers method. Both the strong endothermic character and the positive excess entropy of the mixture suggest an orientational order in 1,1,2,2-tetrachloroethane that is destroyed in the mixing process.

HmE and VmE of some (1-chlorobutane + alkanol or cyclohexanol) mixtures

Abstract Excess molar enthalpies and excess molar volumes of (1-chlorobutane + an alkanol or cyclohexanol) at 298.15 K (also 308.15 K in some case), were measured. The results were “explained” in terms of interactions involving the chlorine atom. Volumetric behaviour of mixtures containing 2-methylpropan-2-ol is analysed by taking into account the high proportion of cyclic structures in this alcohol and the conversion of linear into cyclic multimers when the mixture is formed.

Vapour pressures of {xC4H9OH + (1−x)C8H18}(l) at temperatures between 283.16 K and 323.18 K

Vapour pressures of octane and of (butan-1-ol + octane), at about 5 K intervals between the temperatures 283.16 K and 323.18 K, were measured by a precise static method. Following Barkers method, the activity coefficients and the excess molar Gibbs energies were fitted to a polynomial of degree three. Azeotropic mixtures with a minimum boiling temperature, richer in butan-1-ol with increasing temperature, were observed over the whole temperature range.

Excess molar volumes of several mixtures containing 1,2-dichloroethane

Abstract Excess molar volumes of n -hexane +, 2,2-dimethylbutane +, cyclohexane +, n -hexadecane +, benzene +, and tetrachloromethane + 1,2-dichloroethane, at four temperatures ranging from 288.15 to 318.15 K (298.15 to 328.15 K in the case of n -hexadecane + 1,2-dichloroethane) were measured. The positive temperature coefficients are explained in terms of the conformational equilibrium in 1,2-dichloroethane.

Excess molar volumes of mixtures containing 1,2-dichloropropane or 1,3-dichloropropane

Excess molar volumes VmE of [(1−x)(n-C6H14 or n-C16H34 or CH3C(CH3)2CH2CH3 or c-C6H12 or CCl4 or C6H6) + x(CH2ClCHClCH3 or CH2ClCH2CH2Cl)] at 298.15 and 318.15 K were measured. Mixtures containing 1,2-dichloropropane show VmE values noticeably greater than those of mixtures with 1,3-dichloropropane, and they approach the theoretical Florys predictions.

Excess molar enthalpies of mixtures containing 1,3-dichloropropane

Abstract Excess molar enthalpies H m E of [(1− x ){C 6 H 14 or CH 3 C(CH 3 ) 2 CH 2 CH 3 or c -C 6 H 12 or CCl 4 or C 6 H 6 } + x CH 2 ClCH 2 CH 2 Cl] at four temperatures ranging from 288.15 to 318.15 K, and of {(1− x )C 16 H 34 + x CH 2 ClCH 2 CH 2 Cl} between 298.15 and 328.15 K, were measured. With alkanes, the curves of the excess molar heat capacity C p ,m E obtained from the H m E s show a double minimum.

HmE and VmE for (2,2-dimethylbutane or 2-chloro-2-methylpropane + a monoalcohol)

Abstract Excess molar enthalpies and excess molar volumes of (2,2-dimethylbutane or 2-chloro-2-methylpropane + a monoalcohol) have been measured at 298.15 K. The results are compared with those observed when as first component the linear isomer is used instead.

GmE(298.15 K) of mixtures containing 1,2-dichloroethane

Abstract Vapour pressures of (1,2-dichloroethane + n -hexane or cyclohexane or n -hexadecane or tetrachloromethane or benzene) were measured at 298.15 K. Barkers method was used for calculating activity coefficients and excess molar Gibbs free energies. A maximum-boiling azeotropic mixture is produced with n -hexane, cyclohexane, or tetrachloromethane. (1,2-Dichloroethane + benzene) behaves nearly ideally and (1,2-dichloroethane + n -hexadecane) shows a high value of TS m E .

Excess molar enthalpies of mixtures containing 1,2-dibromoethane

Abstract Excess molar enthalpies of n -hexane +, 2,2-dimethylbutane +, n -hexadecane +, and tetrachloromethane + 1,2-dibromoethane between 288.15 and 318.15 K (298.15 and 328.15 K for n -hexadecane + 1,2-dibromoethane), at intervals of 10 K, were measured.