Ivan Cibulka

Saturated liquid densities of 1-alkanols from C1 to c10 and n-alkanes from C5 to C16: A critical evaluation of experimental data

Abstract The parameters of correlating equations for the calculation of recommended values of saturated liquid density of 1-alkanols and normal alkanes are given. The equations are based on a critical evaluation of published experimental values.

PVT properties of liquids and liquid mixtures: a review of the experimental methods and the literature data

Abstract This paper comprises a classification of various techniques of experimental determination of the PVT properties of liquids and liquid mixtures, and gives brief descriptions of the methods and of the instruments. Empirical equations of state suitable for correlating experimental data are summarized. Literature references to published data compilations are also given. Tables give a bibliography on experimental data for more than 350 pure liquids and 170 binary liquid mixtures. Other important information included in the tables are the range, average step width, and precision of temperature and pressure of measurements, the method used, and a precision of the measured quantity.

Thermodynamics of associating component + saturated hydrocarbon mixtures at low pressures—IV. Correlation of vapour pressures and volumetric properties of some aliphatic amines and their mixtures with n-alkanes in terms of association

Abstract The model, recently developed and used for description of vapour pressures and volumetric properties of pure n-alcohols and their mixtures with n-alkanes, is applied to correlate isothermal vapourliquid equilibria of binary mixtures of n-propylamine, n-butylamine, n-hexylamine, and diethylamine with n-hexane and n-heptane. The model monomer concept is employed to evaluate molecular parameters of monomers. Tertiary amines are selected as the model monomers. Association and structural parameters of amines are obtained by regression on vapour pressures and liquid molar volumes. Pure component parameters are then used to correlate vapourliquid equilibrium of binary mixtures with n-alkanes. An attempt to correlate simultaneously vapourliquid equilibrium and excess volume is also made but the behaviour of the mixtures investigated is found to be rather different from that of mixtures containing alcohols.

Excess molar volumes of binary liquid mixtures of “an oxygenated compound, or cyclopentane, or pentane + 1-bromo-1-chloro-2,2,2-trifluoroethane (halothane)’ at 298.15 K

Excess molar volumes of methanol +, propanol-2-ol +, propan-2-one +, methyl acetate +, tetrahydrofuran +, diethyl ether +, cyclopentane +, and pentane + 1-bromo-1-chloro-2,2,2-trifluoroethane (halothane) at 298.15 K are reported. Tilting dilution dilatometers were used to measure the excess volumes. The results indicate, in view of the structure of halothane and some other results from the literature, hydrogen-bond-like interactions of halothane with oxygenated compounds.

Thermodynamics of associating component + saturated hydrocarbon mixtures at low pressures. I. Description of saturated vapour pressures and liquid molar volumes of pure n-alcohols in terms of association

Abstract A new approach, based on the homomorph concept and taking into account equation of state effects, to correlate saturated vapour pressures and liquid molar volumes of pure n-alcohols is presented. Methyl ethers are used as homomorphs (model monomers). Values of four adjustable parameters, i.e. enthalpy and entropy of association and two structural parameters, obtained by a regression on experimental data are physically meaningful. The results are analysed and compared with some other thermodynamic and spectroscopic data. The presented model can be directly extended to mixtures with inert solvents.

Speed of Sound and Ultrasound Absorption in Ionic Liquids

A complete review of the literature data on the speed of sound and ultrasound absorption in pure ionic liquids (ILs) is presented. Apart of the analysis of data published to date, the significance of the speed of sound in ILs is regarded. An analysis of experimental methods described in the literature to determine the speed of sound in ILs as a function of temperature and pressure is reported, and the relevance of ultrasound absorption in acoustic investigations is discussed. Careful attention was paid to highlight possible artifacts, and side phenomena related to the absorption and relaxation present in such measurements. Then, an overview of existing data is depicted to describe the temperature and pressure dependences on the speed of sound in ILs, as well as the impact of impurities in ILs on this property. A relation between ions structure and speeds of sound is presented by highlighting existing correlation and evaluative methods described in the literature. Importantly, a critical analysis of speeds of sound in ILs vs those in classical molecular solvents is presented to compare these two classes of compounds. The last part presents the importance of acoustic investigations for chemical engineering design and possible industrial applications of ILs.

Partial molar volumes of organic solutes in water. IX. m-Aminophenol and benzonitrile at temperatures from 298 K to 573 K and o-cyanophenol at temperatures from 298 K to 498 K and at pressures up to 30 MPa

Density data for dilute aqueous solutions of 3-amino-1-hydroxybenzene (m-aminophenol), cyanobenzene (benzonitrile), and 2-cyano-1-hydroxybenzene (o-cyanophenol, o-hydroxybenzonitrile) are presented together with partial molar volumes at infinite dilution calculated from the experimental data. The measurements were performed at temperatures from T=298.15 K up to either T=573.15 K (m-aminophenol, benzonitrile) or T=498.15 K (o-cyanophenol) and at either atmospheric pressure, or at pressures close to the saturated vapor pressure of water, and also at p=30 MPa. The data were obtained using a high-temperature high-pressure flow vibrating-tube densimeter for measurements at elevated pressures and a commercial vibrating-tube cell DMA 602HT for measurements at atmospheric pressure.

Thermodynamics of associating component + saturated hydrocarbon mixtures at low pressures. II. Extension of the model to correlate isothermal vapourliquid equilibria and volumetric properties of n-alcohol + n-alkane mixtures

Abstract The model, recently used to describe saturated vapour pressures and liquid volumes of pure n-alcohols, is extended to mixtures of n-alcohols with inert solvents and used to correlate vapour liquid equilibria and excess volumes of n-alcohol + n-alkane mixtures. The model with two binary parameters evaluated by regression on experimental data provides good representation of vapour liquid equilibria and satisfactory description of excess volumes. Empirical generalization of binary parameters, obtained by regression on 40 vapour liquid equilibrium data sets, enables good estimation of vapour liquid equilibria of n-alcohol + n-alkane mixtures. Predictive ability of the model, i.e. when setting the binary parameters equal to zero, is also examined.

Group Contributions for an Estimation of Partial Molar Volumes at Infinite Dilution for Aqueous Organic Solutes at Extended Ranges of Temperature and Pressure

Experimental data on the partial molar volume at infinite dilution in water for two groups of organic solutes (derivatives of benzene and aliphatic hydroxyl derivatives) measured using a vibrating-tube densimeter in the temperature and pressure ranges 298 to 573 K and 0.1 to 30 MPa are summarized. Smoothed values of partial molar volume as a function of temperature and pressure are employed for the evaluation of group and structural contributions. The contributions are used to estimate the partial molar volumes at infinite dilution in water for various solutes. The average deviation between partial molar volumes calculated from the contributions and the experimental data employed for the evaluation of the contributions is less than 1 cm3ċmol−1 in most cases. Predictions of partial molar volumes of solutes not included in the evaluation of the contributions are performed and results are compared with experimental data.

Partial molar volumes of organic solutes in water. VIII. Nitrobenzene and nitrophenols at T=298 K to T=573 K and pressures up to 30 MPa

Density data for dilute aqueous solutions of nitrobenzene and three isomeric nitrophenols (2-, 3-, or 4-nitro-1-hydroxybenzene) are presented together with partial molar volumes at infinite dilution calculated from the experimental data. The measurements were performed at T=298.15 K up to either T=573.15 K (nitrobenzene, m-nitrophenol) or T=548.15 K (p-nitrophenol) or T=523.15 K (o-nitrophenol) and at either atmospheric pressure, or at pressures close to the saturated vapor pressure of water, and also at p=30 MPa. The data were obtained using a high-temperature high-pressure flow vibrating-tube densimeter for measurements at elevated pressures and a commercial vibrating-tube cell DMA 602HT for measurements at atmospheric pressure.