Mariano Gracia

Vapour pressures of (butan-1-ol + hexane) at temperatures between 283.10 K and 323.12 K

Vapour pressures by a static method of n -hexane, n -butan-1-ol, and ( n -butan-1-ol + n -hexane) at temperatures between 283.10 K and 323.12 K at about 5 K intervals, were measured. Activity coefficients and excess molar Gibbs free energies G E m were calculated by Barkers method. Three different types of equations for G E m were used for fitting the experimental results. For alcohol-dilute mixtures, formation of an azeotropic mixture with a minimum boiling temperature was observed.

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.

Densities and viscosities of binary mixtures of butanone with butanol isomers at several temperatures

Densities and viscosities of 1-chlorobutane + 1-butanol, + 2-methyl-1-propanol, + 2-butanol, or + 2-methyl-2-propanol were measured at several temperatures between 288.15 K and 318.15 K. At each temperature, the experimental viscosity data were correlated by means of the McAllister biparametric equation. By using our previous thermodynamic measurements (VLE, HE), we have tested the Wei and Rowley nonparametric model at T = 298.15 K, obtaining average absolute deviations that are comparable to those calculated for the biparametric model.

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.

Excess enthalpies of some (chloroalkane + n-alkane) mixtures

Abstract Excess enthalpies at 298.15 K of some (chloroalkane + n-alkane) mixtures are reported. Excess enthalpies at x = 0.5 for 1-chlorobutane + and t-butylchloride + an n-alkane are compared with those of n-hexane+ and 2,2-dimethylbutane + the same n-alkane. In both sets the differences between the excess enthalpies observed for the branched compound and for the normal one are similar.

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 at several temperatures between 288.15 K and 323.15 K of di-n-propylether with 1-hexanol or 1-octanol. Application of the ERAS model

Abstract Vapour pressures of di- n -propylether+1-hexanol or +1-octanol were measured at several temperatures between 288.15 K and 323.15 K by a static method. Reduction of the vapour pressures to obtain activity coefficients and excess molar Gibbs free energies was carried out by Barkers method. G E , H E , and V E , at 298.15 K, are compared with predictions of the ERAS-model observing that the model reproduces acceptably the experimental behaviour.

Excess enthalpies of mixtures containing tetrahydrofurfurylalcohol or tetrahydrofurfurylamine

Abstract Molar excess enthalpies over the whole composition range for tetrahydrofurfurylalcohol or tetrahydrofurfurylamine + cyclohexane, + carbon tetrachloride, + benzene, and + tetrahydrofuran, and of tetrahydrofuran + cyclohexane and + benzene were measured at 303.15 K. A few measurements on tetrahydrofurfurylalcohol + and tetrahydrofurfurylamine + cyclohexane were made at 323.13 K. Partial molar excess enthalpies at infinite dilution of alcohol and amine have been calculated. The results are discussed in terms of hydrogen bonding in tetrahydrofurfurylalcohol and tetrahydrofurfurylamine and of specific interactions between the unlike molecules.

HmE of (an n-alkane + a butanol isomer)

Abstract Excess molar enthalpies of (an n -alkane + a butanol isomer) were measured at 298.15 and 318.15 K. The peculiar shapes of the curves, especially for mixtures containing 2-methylpropan-2-ol, might be put down to the formation of cyclic multimers. The temperature coefficients of H m E are always positive and they increase as the chain-length of the n -alkane increases.

Excess volumes of 1,1,2,2-tetrachloroethane + tetrachloroethylene, and of 1,1,2,2-tetrachloroethane and of tetrachloroethylene + cyclohexane, + benzene, and + carbon tetrachloride at 303.15 K

Abstract Excess volumes of 1,1,2,2-tetrachloroethane + cyclohexane, + benzene, + carbon tetrachloride; of tetrachloroethylene + cyclohexane, + benzene, + carbon tetrachloride; and 1,1,2,2-tetrachloroethane + tetrachloroethylene, have been measured at 303.15 K by a dilatometric method. For benzene + 1,1,2,2-tetrachloroethane some measurements have also been carried out at 313.15 K. The results obtained are related with the H E measurements for the same mixtures.