Kazuhiro Tamura

Excess molar enthalpies of {methanol or ethanol + (2-butanone + benzene)} at 298.15 K

Abstract The excess molar enthalpies of (methanol + 2-butanone + benzene) and (ethanol + 2-butanone + benzene) at 298.15 K, measured with an isothermal dilution calorimeter, are reported. The experimental results are compared with those calculated from an association model based on mole-fraction statistics.

Representation of Multicomponent Liquid-Liquid Equilibria for Aqueous and Organic Solutions Using a Modified UNIQUAC Model

A modified form of the UNIQUAC model is presented to accurately reproducebinary phase equilibria and ternary and quaternary liquid-liquid equilibria ofaqueous and organic solutions. The model gives a good representation in thereproduction of binary coexistence curves over a wide temperature range usingtemperature-dependent parameters and of binary vapor-liquid equilibria usingtwo binary energy parameters, and in the correlation of ternary and quaternaryliquid-liquid equilibria using ternary and quaternary parameters, in addition tobinary parameters. The quaternary calculated results are compared with thoseobtained from the modified Wilson and extended UNIQUAC models.

Excess enthalpies of binary and ternary mixtures of methanol with acetone, chloroform, benzene, and tetrachloromethane

Abstract Molar excess enthalpies at 298.15 K measured using an isothermal dilution calorimeter are reported for the binary mixtures methanol-acetone, methanol-chloroform and methanol-tetrachloromethane, and for the ternary mixtures methanol-chloroform-acetone and methanol-benzene-tetrachloromethane. The results are analyzed using an associated-solution theory which includes four equilibrium constants for the self-association of methanol, and solvation equilibrium constants between unlike molecules.

Excess enthalpies and complex formation of acetonitrile with acetone, chloroform, and benzene

Abstract Excess enthalpies of binary systems of acetonitrile—acetone, chloroform—acetone and chloroform—benzene, and ternary systems of acetonitrile—chloroform—acetone and acetonitrile—chloroform—benzene are reported at 25°C. The results are analyzed with thermodynamic association theory for complex ternary liquid mixtures. The theory involves two types of self-association of acetonitrile, formation and binary complexes for component pairs of a ternary system, and a nonspecific interaction term expressed by the NRTL equation between various chemical species.

Thermodynamics of solutions of methanol and solvating components

Abstract A model is proposed to correlate the excess Gibbs free energies and excess enthalpies of binary solutions of methanol and a solvating component. Solution nonideality from ideal solutions is given by the sum of the chemical contribution term, which is due to self-association of methanol and solvation between methanol and a nonassociating component, and the physical contribution term with allowance for the NRTL equation. The model uses the following data for methanol: two enthalpies for formation of the hydrogen bonds for the dimer and all larger polymeric species, three equilibrium constants of stepwise association for the dimer, trimer and other polymeric species, and an equilibrium constant for cyclic species of more than tetramer. The association model further includes an additional solvation equilibrium to allow for the interaction between the terminal hydroxyl group of methanol polymeric species and a solvating component. The model is extended to predict vapor—liquid equilibria, liquid—liquid equilibria and excess enthalpies for ternary solutions containing methanol and two nonassociating components from only binary information. Calculated results are in good agreement with experimental data as shown by selected illustrative examples.

Thermodynamics of alcohol solutions. Excess molar enthalpies of ternary mixtures containing two alcohols and one active nonassociating component

Abstract The UNIQUAC associated-solution theory proposed by Nagata and Gotoh to calculate the excess molar enthalpy of ternary mixtures containing two alcohols and one saturated hydrocarbon is extended to predict ternary excess molar enthalpies for mixtures formed by two alcohols and one active nonassociating component. The proposed model includes only binary parameters. Calculated results derived from the model are in excellent agreement with experimental excess molar enthalpies for ethanol-1-propanol-benzene at 25°C, measured with an isothermal dilution calorimeter.

Excess enthalpies for the systems acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane at 298.15 K

Abstract Nagata, I., Tamura, K. and Tokuriki, S., 1982. Excess enthalpies for the systems acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane at 298.15 K. Fluid Phase Equilibria, 8: 75-86 Excess enthalpies at 298.15 K are reported for the binary mixtures acetonitrile-benzene, acetonitrile-tetrachloromethane, benzene-tetrachloromethane, acetonitrile-dichloromethane and dichloromethane-tetrachloromethane, and for the ternary mixtures acetonitrile-benzene-tetrachloromethane and acetonitrile-dichloromethane-tetrachloromethane. The results are analysed by means of an associated-solution theory which includes two types of self-association for acetonitrile, the formation of binary complexes CH3CN·C6H6, CH3CN·CH2Cl2 and C6H6·CCl4, and a physical-contribution term expressed by the NRTL equation.

Excess molar enthalpies of (propan-1-ol or propan-2-ol+acetonitrile), (propan-1-ol or propan-2-ol+chlorobenzene), and (propan-1-ol or propan-2-ol+acetonitrile+chlorobenzene) at 298.15 K

Abstract The excess molar enthalpies of (propan-1-ol + acetonitrile), (propan-2-ol + acetonitrile), (propan-1-ol + chlorobenzene), and (propan-2-ol + chlorobenzene), and of (propan-1-ol + acetonitrile + chlorobenzene) and (propan-2-ol + acetonitrile + chlorobenzene) at 298.15 K, measured in an isothermal dilution calorimeter, are presented. The binary experimental values are correlated by means of an association model, and the ternary results are compared with those calculated from the model with binary parameters.

Excess enthalpies of binary and ternary mixtures of acetonitrile with methanol, ethanol and benzene

Abstract Excess molar enthalpies are measured for the binary mixtures methanol—acetonitrile and ethanol—acetonitrile at 25 and 35°C and for the ternary mixtures methanol—acetonitrile—benzene and ethanol—acetonitrile—benzene at 25°C using an isothermal dilution calorimeter. The binary results are well reproduced with an association model which contains four equilibrium constants for the association of alcohol, two equilibrium constants for that of acetonitrile, and two solvation equilibrium constants between alcohol and acetonitrile molecules. The ternary results are compared with those calculated from the model with binary parameters.

Thermodynamics of solutions of propanols in nonassociating components

Abstract The spectroscopic and thermodynamic properties of solutions of propanols in various nonassociating components can be described well by an associated solution model in which the association of alcohol molecules into open-chain and cyclic hydrogen-bonded species and the formation of complexes between the terminal hydroxyl group of the alcohol chain molecules and a solvating component are taken into account, with allowance for a non-polar interaction term. Ternary predicted values of vapor—liquid equilibria and excess enthalpies for mixtures including propanol and two nonassociating components are in good agreement with experimental results.