Isobaric Vapor–Liquid Equilibrium for the Binary Mixture of 1-Butanol + Butyl l-Lactate at 1 and 5 kPa

Abstract

This work presents the isobaric vapor–liquid equilibrium (VLE) data for the binary mixture of butyl l-lactate + 1-butanol, which was measured at 1 and 5 kPa. The measurements were carried out in an equilibrium cell Fischer Labodest VLE 602D and binary mixtures were analyzed by gas chromatography. The experimental data reported were thermodynamically consistent according to the Van Ness and Fredenslund tests. The equilibrium was correlated with the nonrandom two-liquid (NRTL) and universal quasichemical (UNIQUAC) activity models with asymmetrical parameters. Both activity models present a very approximated correlation with experiments for being applied to the distillation process design, especially, at low-pressure conditions.

Separation of Azeotropic Mixtures of Ethyl Acetate + Methylcyclohexane: Vapor–Liquid Equilibrium Measurements

“…The isobaric VLE data for the ethyl acetate + methylcyclohexane binary system were determined at 101.3 and 20.0 kPa in the present work, the vapor was therefore regarded as ideal gas and thus the activity coefficient is expressed as the modified Raoult’s law γ i = y i p x i p i s where γ i is the activity coefficient of component i in the liquid phase; x i and y i are the mole fractions of component i in vapor and liquid phases, respectively; p is the pressure of the system; p i s is the saturated vapor pressure of component i at temperature T , which is correlated using the following Antoine equation ln ( p i s / kPa ) = A i − B i T / normalK + C i where A i , B i , and C i are parameters of the Antoine equation for component i . , The parameters for ethyl acetate and methylcyclohexane are listed in Table .…”

“…where A i , B i , and C i are parameters of the Antoine equation for component i. 6,7 The parameters for ethyl acetate and methylcyclohexane are listed in Table 3.…”

Isobaric Vapor–Liquid Equilibrium of Isoamyl Alcohol, Cyclohexane, n-Hexane, and the n-Heptane + Isoamyl Butyrate Binary System at 101.3 kPa

“…It is important to check the thermodynamic consistency of experimental data. The purpose of thermodynamic consistency tests is to test the reliability of data, and common methods are the Fredenslund test, Van Ness point test, and Wisniak method . Pequenín et al measured VLE isobaric data for the ternary system (water + cyclohexane + heptane) at 101.3 kPa and used the Wisniak method to test the thermodynamic consistency of data.…”

“…Wilson, UNIQUAC, and NRTL models are common models for fitting experimental data. Marrufo et al 23 determined the VLE data of the 1-hexene + nhexane and cyclohexane + cyclohexene binary systems at 30, 60, and 101.3 kPa. Isobaric VLE data of four binary systems have been correlated by Wilson, UNIQUAC, and NRTL models, and good results have been obtained.…”

Isobaric Vapor–Liquid Equilibrium Data for Four Binary Systems of n-Hexane + 1,2-Dichloroethane, tert-Butyl Acetate, sec-Butyl Acetate, and n-Propyl Acetate at 101.3 kPa

“…In the conceptual design of the extractive distillation process, the binary interaction parameters of the thermodynamic model are required, 15 which can be regressed using the VLE data for the binary systems involved in the separation. Few researchers have reported the VLE data for the system of n-hexane + 1,2dichloroethane.…”