Experimental High-Pressure Isochoric/Isoplethic Equilibrium for the Systems Propane + n-Pentane and Propane + Diethyl Ether

MATIAS MENOSSI; SEVERINE CAMY; PABLO EZEQUIEL HEGEL; MARCELO SANTIAGO ZABALOY; JUAN MANUEL MILANESIO

JOURNAL OF CHEMICAL AND ENGINEERING DATA

AMER CHEMICAL SOC

Lugar: Washington; Año: 2019 vol. 69 p. 3848 - 3860

0021-9568

In this work, loci of isochoric (constant global density)- isoplethic (constant global composition)phase equilibria, generally made of heterogeneous and homogeneous segments, were experimentally studied for the pure compoundspropane (C3), diethyl ether (DEE), n-pentane (C5) and dimethyl ether (DME); and forthe binary systems C3+C5 and C3+DEE. The temperature and pressure rangesof the new binary experimental dataare, roughly, from 320 to 470 K, and from 1 to 25 MPa,respectively. The binary experiments were performed at varying overall density (ρ) and varying propane mole fraction (XC3). The obtained experimental loci are curves in the pressure-temperature domain, of set global density and global composition. Such loci establish the relationship between temperature, pressure, global density and global composition for the mixture of interest. The obtained curves made it possible to determine phase boundaries for the studied pure compounds and mixtures: a phase transition is identified when there is a discontinuous change in the pressure vs temperature slope of the isochoric/isoplethic locus.The experimental data obtained were correlated using the Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) equation of state (EoS). The model,at the set values for the model parameters, is capable of reproducing the single-phase pressure vs. temperature behavior and the phase transitions. The systems C3+C5 and C3+DEE are subsystems of interest in relation to the hydrogenation of unsaturated heavy compounds using supercritical solvents as reaction media.