Mariana Teodorescu

Isothermal vapour–liquid equilibria for pentan-3-one+1,4- dichlorobutane, +trichloromethane, +1,1,1-trichloroethane, +1,1,2,2-tetrachloroethane binary mixtures

Abstract Isothermal vapour–liquid equilibrium data are reported for binary mixtures containing pentan-3-one with 1,4-dichlorobutane from 343.15 to 373.15 K, trichloromethane from 313.15 to 343.15 K, 1,1,1-trichloroethane from 323.15 to 353.15 K, and 1,1,2,2-tetrachloroethane from 343.15 to 373.15 K. A modified equilibrium still is described. The experimental data were correlated using the Redlich–Kister, Wilson and NRTL models by means of the maximum likelihood method.

Densities and excess volumes of pentan-3-one + 1,2-dichloroethane, + 1,3-dichloropropane, +1,4 -dichlorobutane, + trichloromethane, +1,1,1-trichloroethane, +1,1,2,2,-tetrachloroethane binary mixtures at 298.15 K

Abstract Densities and excess molar volumes, VE, of pentan-3-one+1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane, +trichloromethane, +1,1,1-trichloroethane, +1,1,2,2-tetrachloroethane are presented at 298.15 K and atmospheric pressure over the whole composition range. These measurements were performed in order to complement the data on VLE [M. Teodorescu, A. Barhala, O. Landauer, ELDATA: Int. Electron. J. Physico-Chem. Data 3 (1997) 101–108; M. Teodorescu, K. Aim, I. Wichterle, Fluid Phase Equilibria, in press] and to investigate the influence of molecular structure of these chloroalkanes on VE in their mixtures with pentan-3-one. At this temperature, VE was found to be slightly positive at high mole fractions and slightly negative at low mole fractions of 1,2-dichloroethane in case of the first system. For all the other systems, VE was negative. The VE experimental results were correlated using the fourth-order Redlich–Kister equation, and the maximum likelihood procedure was applied for evaluating the adjustable parameters.

Azeotropic and solid–liquid equilibria data for several binary organic systems containing one acetal compound

Abstract Reliable azeotropic data have been measured for the following four binary systems: methanol+diethoxymethane, 2-propanol+diethoxymethane, diethoxymethane+dimethyl carbonate and 2,2-dimethoxybutane+toluene by means of a wire band column. Additionally, solid–liquid equilibria (SLE) for the six binary systems of benzene and cyclohexane with diethoxymethane, 2,2-dimethoxybutane, and 1,1-diethoxyethane have been measured by a visual technique. Due to correlation requirements of the SLE experimental data, the heat of fusion for 2,2-dimethoxybutane and 1,1-diethoxyethane have been measured using a Tian–Calvet batch calorimeter. The azeotropic data were compared with literature values, when available, or with predicted data by Modified UNIFAC (Dortmund) when all required parameters were at disposal, too. For the description of the SLE data the NRTL model has been used with good results. Also, the results of the Modified UNIFAC (Dortmund) model have been checked using the already available “ether” group parameters. The work was carried out in order to supplement the available data base for acetal systems required for the introduction of a new “acetal” group in the Modified UNIFAC (Dortmund) model.

Isothermal vapour-liquid equilibria and densities for the 5-chloropentan-2-one + n-hexane, + toluene and + ethylbenzene binary mixtures

Isothermal vapour–liquid equilibrium (VLE) data are reported for binary mixtures containing 5-chloropentan-2-one with n-hexane (from 323.15 to 353.15 K), and toluene or ethylbenzene (from 343.15 to 373.15 K). The data are complemented by excess molar volumes (VE) obtained from density measurements at 298.15 K over the whole composition range. The VLE and VE experimental data are correlated by means of the Redlich–Kister equation using the maximum likelihood procedure.

Vapour pressures and excess Gibbs energy of ethylbenzene-cyclooctane binary mixtures

Abstract Isothermal vapour-liquid equilibrium data at 343.15, 353.15 and 373.15 K for ethylbenzene + cyclooctane mixtures are reported. Use has been made of an ebullioneter which allowed sampling from both phases in equilibrium. Different G E expressions suitable for correlation of these data were tested. The results evidenced a positive deviation from ideality of the system.

Application of the Predictive UNIFAC Model to the Pentan‐3‐one/Chloroalkane and 5‐Chloro‐2‐pentanone/Hydrocarbon Binary Systems

The predictive capability of the UNIFAC model by Fredenslund et al. (1977) using the last revised parameters of Hansen et al. (1991) was tested to describe the behavior of the binary systems of pentan-3-one + chloroalkane and 5-chloro-2-pentanone + hydrocarbon in the range of 313.15–373.15 K at low or moderate pressures. The chloroalkanes under study were 1,2-dichloroethane, 1,3-dichloropropane, 1,4-dichlorobutane, trichloromethane, 1,1,1-trichloroethane, and 1,1,2,2-tetrachloroethane; the hydrocarbons investigated were n-hexane, toluene, and ethylbenzene. The results obtained were compared with the experimental data on VLE and the excess Gibbs energy reported recently by Teodorescu et al. (1997, 1998). The best results in prediction were found for the system of pentan-3-one + 1,4-dichlorobutane with average deviation up to 0.0041 for the vapor-phase composition and up to 1.83 % in pressure. For the other systems of dichloroalkanes the deviations increase with decreasing size of chloroalkane. For the systems of trichloro- or tetrachloroalkanes the deviations are larger than for dichloroalkanes in both vapor-phase composition and pressure. For the mixtures of 5-chloro-2-pentanone + hydrocarbon the best prediction was obtained for n-hexane (up to 0.0058 in the vapor-phase composition and 5.70 % in pressure). The best description of the excess Gibbs energy is given for 5-chloro-2-pentanone + n-hexane mixture.