High Temperature and High Pressure Volumetric (Density and Apparent Molar Volumes) Properties of (CaCl₂ + C₂H₅OH) Solutions

Abstract

The (p, F, T) and some derived volumetric properties such as apparent molar volumes V φ of CaCl 2 in ethanol, isothermal compressibility, and thermal expansion coefficients of (CaCl 2 + C 2 H 5 OH) solutions at T ) (298.15 to 398.15) K and pressures up to p ) 40 MPa are reported. The density measurements were made at seven molalities of m ) (0.09327, 0.17427, 0.43788, 0.68992, 0.98955, 1.26564, and 1.55045) mol • kg -1 of CaCl 2 . An empirical correlation for the density of (CaCl 2 + C 2 H 5 OH) as a function of pressure, temperature, and molality has been developed. This equation of state was used to calculate other volumetric properties such as isothermal compressibility and thermal expansion coefficients. The derived values of apparent molar volumes were extrapolated to zero concentration to calculate the values of apparent molar volumes (or partial molar volumes) at infinite dilution.

High - temperature and high-pressure (p, ρ, T) measurements and derived thermodynamic properties of 1-octyl-3-methylimidazolium hexafluorophosphate

“…Density of [OMIM][PF 6 ] as a function of temperature and pressure was measured using a modernized high-pressure and high-temperature Anton Paar DMA HPM vibration tube densimeter (VTD). 9,[23][24] The apparatus and the experimental method (the physical basis and theory of the method, procedures, uncertainty assessment) were successfully employed and described in details previously 3,6,9,10,13,[23][24][25][26] for measurements of the densities of ILs, ILs containing binary mixtures, ocean and geothermal waters at high temperatures and high pressures, so only a brief review will be given here. The temperature in the measuring cell, where the U-tube is located, was controlled using a thermostat (F32-ME Julabo, Germany) within 0.01 K and was measured with the (ITS-90) Pt100 thermometer (Type 2141), with an expanded absolute uncertainty of 0.015 K. Pressure was measured using transmitters P-30 (max.…”

“…This EOS was successfully used for accurate representation of the experimental high-pressure and high-temperature (p, ρ, T) data for various pure liquids, binary mixtures and sea water in the liquid phase. [23][24][25][26][33][34][35] The theoretical bases of the EOS, Eq. 2, was developed by Putilov 36 using Gabriel, 37 Me, 38 and Grüneisen 39 intermolecular potential function.…”