Isobaric Vapor–Liquid Equilibrium for Binary Systems of 2,2,4-Trimethylpentane with o‑Xylene, m‑Xylene, p‑Xylene, and Ethylbenzene at 250 kPa

Isobaric vapor–liquid equilibrium (VLE) data were determined at the pressure of 250 kPa for the four binary mixtures composed of 2,2,4-trimethylpentane (isooctane) + para-, ortho-, or meta-xylene and ethylbenzene (EB) by using a circulation-type apparatus, in which both vapor and liquid phases are recirculated. The vapor- and liquid-phase compositions were analyzed by gas chromatography. All of the data were found to be thermodynamically consistent according to the Herington, van Ness, infinite dilution, and pure component consistency tests. The experimental data were regressed with Aspen Plus 7.3, and binary interaction parameters were reported for the most frequently used activity coefficient models: the nonrandom two-liquid (NRTL) and the universal quasichemical activity coefficient (UNIQUAC) models, respectively. All of the calculated values with these models showed good agreement with the experimental data, as well as with available isobaric and isothermal data from the literature.