(p,Vm,T) measurements of (octane+benzene) at temperatures from (298.15 to 328.15)K and at pressures up to 40MPa (original) (raw)
Related papers
Fluid Phase Equilibria, 2003
Densities were measured for the liquid benzene and 1,3,5-trimethylbenzene, and for nine of their mixtures at four temperatures between 298.15 and 328.15 K and at pressures up to 40 MPa. An apparatus for density measurements of liquids and liquid mixtures whose main part is a high-pressure vibrating-tube densimeter working in a static mode was used for the measurement. The density data were fitted to the Tait equation and the isothermal compressibilities were calculated with the aid of this equation. Excess molar volumes were also calculated from the densities and fitted to the Redlich-Kister equation.
Journal of the Serbian Chemical Society, 2015
Densities data of n-hexane, toluene and dichloromethane at temperatures 288.15-413.15 K and at pressures 0.1-60 MPa, determined in our previous work, were fitted to the modified Tait equation of state. The fitted temperature-pressure dependent density data were used to calculate the derived properties: the isothermal compressibility, the isobaric thermal expansivity, the difference between specific heat capacity at constant pressure and at constant volume and the internal pressure, over the entire temperature and pressure intervals specified above. In order to assess the proposed modeling procedure, a comparison of the obtained values for the isothermal compressibility and the isobaric thermal expansivity with the corresponding literature data were performed. The average absolute percentage deviations for isothermal compressibility were: for n-hexane 2.01-3.64%, for toluene 0.64-2.48% and for dichloromethane 1.81-3.20%; for the isobaric thermal expansivity: for n-hexane 1.31-4.17%, ...
Journal of Molecular Liquids, 2019
The values of pressure (P), the temperature derivative, γ V = (∂P/∂T) V , and the density (ρ) of benzene have been simultaneously measured in the near-and supercritical regions using high-temperature and high-pressure piezo-calorimeter. Measurements were made along 10 liquid and vapor isochores between (265.5 and 653.9) kg•m −3 and at temperatures from (346.03 to 615.92) K and at pressures up to 9.171 MPa. For each isochore most measurements were made in the immediate vicinity of the liquid-gas phase transition temperature (singleand two-phase regions) where the break of the P-T isochores and the jumps of the thermal-pressure coefficient γ V are observing. Temperatures and pressures (T S , P S) at the liquid-gas phase transition curve for each constant density (isochore, ρ) and the critical parameters (T C ,P C ,ρ C) for benzene were measured using the isochoric P − T break point and thermal-pressure coefficient jump techniques. The expanded uncertainty of the pressure (P), density (ρ), and thermal-pressure coefficient (γ V) measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be, 0.16%, 0.05% and (0.12 to 1.5) % (depending on temperature and pressure), respectively. The measured pressures (PVT) and thermal-pressure coefficients (γ V VT) have been used to calculate of the internal pressure (or energy-volume coefficient) as ð ∂U ∂V Þ T ¼ Tð ∂P ∂T Þ V −P. We have also measured the temperature derivatives of the internal energy ð ∂U ∂T Þ V ¼ C V (isochoric heat capacity) using the same piezocalorimetric cell. The effect of pressure and temperature on the internal pressure was studied. Isochoric P-T curve break point and isochoric thermal-pressure coefficient jump techniques were used to accurately determine of the phase transition and critical points parameters. The measured values of the thermal-pressure coefficient were interpreted in term of scaling theory of critical phenomena. The measured values of pressure (P), temperature derivative, (∂P/∂T) V , temperature and density at the saturation curve together with our previous isochoric heat capacity measurements were used to calculate other thermodynamic properties of benzene at saturation curve.
The Journal of Chemical Thermodynamics, 2005
Densities were measured for the liquid toluene and propiophenone, and for nine of their mixtures at four temperatures between 298.15 K and 328.15 K and at pressures up to 40 MPa. An apparatus for density measurements of liquids and liquid mixtures whose main part is a high-pressure vibrating-tube densimeter working in a static mode was used for the measurement. The density data were fitted to the Tait equation and the isothermal compressibilities were calculated with the aid of this equation. Excess molar volumes were also computed from the densities and fitted to the Redlich-Kister equation.
Fluid Phase Equilibria, 1999
Excess molar volumes, changes of refractive indices, and changes of isentropic compressibilities of the Ž. Ž. Ž. ternary mixture benzene 1 q cyclohexane 2 q 2-methyl-2-butanol 3 , and the corresponding binary mixtures Ž. Ž. Ž. Ž. benzene 1 q 2-methyl-2-butanol 3 , and cyclohexane 2 q 2-methyl-2-butanol 3 have been evaluated from density, refractive index, and speed of sound measurements at 298.15 K, and atmosphere. These derived properties of binary, and ternary mixtures were fitted to Redlich-Kister, and Nagata equations, respectively, the correlation parameters being gathered. In spite of the high non-ideality observed, the excess molar volumes were satisfactorily predicted by means of cubic equations of state with simple mixing rules.
International Journal of Thermophysics, 2020
Densities of two methane-rich binary mixtures were measured in the homogeneous liquid and the supercritical region at temperatures between (100 and 160) K using a low-temperature single-sinker magnetic-suspension densimeter. For each mixture, four isotherms were studied over the pressure range from (0.3 to 10.8) MPa. Molar compositions of the gravimetrically prepared methane-rich binary mixtures were approximately 0.01 butane and 0.02 isopentane, respectively, with the balance being methane. The relative expanded combined uncertainty (k = 2) of the experimental densities was estimated to be in the range of (0.02 to 0.06) %. Due to a supercritical liquefaction procedure and the integration of a special VLE-cell, it was possible to measure densities in the homogeneous liquid phase without changing the composition of the liquefied mixture. Based on the supercritical liquefaction procedure, a new time-saving measurement procedure was developed and applied. Moreover, saturated-liquid den...
Densities and excess volumes of the benzene-cyclohexane system between 298.15 and 473.15 K
Fluid Phase Equilibria, 1994
This paper reports the results of measurements of the densities of binary mixtures of benzene with cyclohexane using a high pressure stainless steel pycnometer system for the whole composition range at various temperatures between 298.15 and 473.15 K. The experimental densities were compared with those predicted by the Hankison-Brobst-Thomson (HBT) correlation and the Spencer and Danner Modified Rackett (SDR) equation. Both the HBT and the SDR showed an average deviation of about 0.58%. The excess molar volumes, VE, calculated from the density values have been found to be positive for all the concentrations and temperatures considered.
Isochoric (p, Vm, x, T) measurements on (methane + ethane) from 100 to 320 K at pressures to 35 MPa
The Journal of Chemical Thermodynamics, 1985
Comprehensive isochoric (p, V,, x, 7) values have been obtained for {z&H, +(l-x)&H,} with x = 0.35, 0.50, and 0.69 at amount-of-substance densities from 1 to 25 mol.dme3. The measurements for each composition cover a temperature range from approximately 100 to 320 K at pressures up to 35 MPa. For each mixture the results have been fit to a 324erm modified Benedict-Webb-Rubin equation of state. Further development of the extended corresponding-states model has been accomplished using the results presented here. Comparisons with values from independent sources have been made where possible.
The Journal of Chemical Thermodynamics, 2015
New isothermal pTxy data are reported for methane + benzene and methane + methylbenzene (toluene) at pressures up to 13 MPa over the temperature range (188 to 313) K using a custom-built vapor-liquid equilibrium (VLE) apparatus. The aim of this work was to investigate literature data inconsistencies and to extend the measurements to lower temperatures. For methane (1) + benzene (2), measurements were made along six isotherms from (233 to 348) K at pressures to 9.6 MPa. At temperatures below 279 K there was evidence of a solid phase, and thus only vapor phase samples were analyzed at these temperatures. For the methane (1) + methylbenzene (3) system, measurements were made along seven isotherms from (188 to 313) K at pressures up to 13 MPa. Along the 198 K isotherms, a significant change in the data's p,x slope was observed indicating liquid-liquid equilibria at higher pressures. The data were compared with literature data and with calculations made using the Peng-Robinson (PR) equation of state (EOS). For both binary systems our data agree with much of the literature data that also deviate from the EOS in a similar manner. However, the data