Experimental study and modeling of the isothermal VLE properties of ethylbenzene in supercritical solvents (CO2 and C3H8)

Experimental Study and Modeling of the Isothermal VLE Properties of the Supercritical C3H8 + Aniline Mixture at High Temperatures and High Pressures

“…The experimental VLE apparatus is based on the static-analytic method and consists of an equilibrium optical cell that can be operated up to 50 MPa and 473.15 K. A detailed description of the apparatus (design, schematic diagram), procedure of measurements, uncertainty assessment, etc., has been given in our earlier publications. − The experimental VLE apparatus and procedure of measurements used for the present study were similar to those of our previous studies and used without changes. Only a brief review is given here.…”

“…The procedure separation of the extracted blend of aniline and C 3 H 8 into gaseous (C 3 H 8 ) and liquid (aniline) phases is the same as in our precious publications. − Before the determination of the mass m anil of the dissolved aniline in the SC C 3 H 8 , the separation of the gaseous (C 3 H 8 ) and liquid (aniline) components was carried out by cooling the sampler to room temperature of 293 K. The melting and boiling temperatures of aniline are T m = 267 ± 0.3 K and T b = 457 ± 2 K (NIST), respectively. At room temperature, aniline condensed into the liquid phase and noncondensable gas-phase (C 3 H 8 ) is completely separating from the liquid phase (aniline).…”

“…The mass of C 3 H 8 m c 3 H 8 M C 3 H 8 has been determined using the same way. The masses were determined with a precision electronic balance (Vibra AF-R220CE, Japan) with an uncertainty of 1 × 10 –4 g. Detailed descriptions of the sampling and concentration determination procedures are available elsewhere. − …”

“…The correct operation of the VLE apparatus used in the present work to measure phase equilibrium properties ( PTxy relationship) of C 3 H 8 + aniline mixture and the experimental procedure were checked in our previous publications − with well-studied binary mixture such as (SC CO 2 + toluene) and (propane + n -butane) and their pure components for which reliable VLE data is available in the literature. As was shown in our previous publications, , the experimental VLE data of (SC CO 2 + toluene) and (propane + n -butane) mixtures obtained using the present VLE apparatus and the method of measurements are in good agreement with the reliable reported data − obtained using different techniques.…”

“…This work is a part of a long-term continuing program on study of the isothermal phase-equilibrium ( PTxy ) property measurements of binary and ternary mixtures at high-temperatures and high-pressures where one of the components of which is a SC fluid (solvent, SC CO 2 or light n -alkane). In our previous series studies − we have measured VLE properties of binary and ternary system containing SC fluids (CO 2 , propane, or propane + n -butane binary mixture) using the same method and experimental high-temperature and high-pressure VLE apparatus as in the present work without modification. In the present work, isothermal VLE property data of binary mixture of aniline with C 3 H 8 are presented at five isotherms between (393.15 and 523.15) K, for which no reported experimental VLE data are available in the literature.…”