Isobaric Vapor–Liquid Equilibria for the 1-Propanol + Ethylene Glycol Monopropyl Ether and 1-Butanol + Ethylene Glycol Monopropyl Ether Systems

Abstract

VaporÀliquid equilibria (VLE) for 1-propanol + ethylene glycol monopropyl ether and 1-butanol + ethylene glycol monopropyl ether systems were investigated. The systems studied are isobaric VLE of the highly associating fluid mixtures, and the measurements were carried out at several pressures (60 kPa, 80 kPa, and 100 kPa) using Fischer VLE 602 equipment. A consistency test with respect to the experimental data was conducted using Fredenslud and Wisniak methods. Correlations of the experimental data were carried out using a two-term virial equation for vapor-phase fugacity coefficients and the three suffix Margules, Wilson, NRTL, and UNIQUAC models for liquid-phase activity coefficients. The results show good agreements with the experimental data at the C3E1 rich region but not at the alcohol rich region due to the strong and complex association of these systems. Additionally there are no azeotrope points.

Isobaric Vapor–Liquid Equilibria for the 2-Propanol + Ethylene Glycol Monopropyl Ether and 2-Butanol + Ethylene Glycol Monopropyl Ether Systems at 60 kPa, 80 kPa, and 100 kPa

“…Further explanations of eqs 10 to 16 are provided in our previous studies. 11 The strength of the Wisniak consistency test is that it can be carried out, not only without excess enthalpy of mixing, but also simultaneously using the point test and area test. The detailed methods are provided elsewhere.…”

“…The apparatus and procedures have been described previously. − Briefly, the apparatus was a Labodest VLE 602 (i-Fischer Engineering GmbH, Waldbuettelbrunn, Germany). The operating principle of the apparatus involved the circulation of both vapor and liquid phases from the equilibrium cell using evaporated feed at a constant pressure and temperature.…”

“…First, we investigated the effect of a surfactants [ethylene glycol monopropyl ether (2-propoxyethanol or C3E1) and ethylene glycol isopropyl ether (2-isopropoxyethanol or i C3E1)] mainly in mixtures with linear C6, C7, and C8 hydrocarbons using isothermal VLE of C3E1 with n -hexane and n -heptane, isobaric VLE of i C3E1 with n -hexane and n -heptane, and isobaric VLE of C3E1 with n -heptane and n -octane . Second, to study the branch effect of alcohols with C3E1, the isobaric VLE of C3E1 with 1-propanol and 1-butanol systems was measured. In this study, we measured the VLE for the binary system of 2-propanol + ethylene glycol monopropyl ether (C3E1) and 2-butanol + ethylene glycol monopropyl ether (C3E1), respectively, at three different pressures (100 kPa, 80 kPa, and 60 kPa).…”