(616g) Vapor-Liquid Equilibrium of Ethanol + Isoamyl Alcohol At 50 and 101.3kPa | AIChE

(616g) Vapor-Liquid Equilibrium of Ethanol + Isoamyl Alcohol At 50 and 101.3kPa

Authors 

Cordoba, F. P. - Presenter, Universidad Nacional de Colombia
Duran, J. A. - Presenter, Universidad Nacional de Colombia
Gil, I. D. - Presenter, Universidad Nacional de Colombia
Rodriguez, G. - Presenter, Universidad Nacional de Colombia


Vapor-Liquid
Equilibrium of Ethanol + Isoamyl Alcohol at 50 and 101.3kPa

Fernando
Córdoba1
, Jairo Duran1, Alvaro
Orjuela L1 Iván Gil1, Gerardo Rodríguez1.

1
Grupo
de Procesos Químicos y Bioquímicos, Department of Chemical and Environmental
Engineering, Departamento de Ingeniería Química y Ambiental

Abstract

Vapor-liquid
equilibrium data for the system Ethanol + Isoamyl alcohol were measured at 50
and 101.3 kPa. A dynamic equilibrium apparatus was used for the measurements
(Fischer Labodest VLE-602). Equilibrium data were fitted with UNIFAC Dortmund,
NRTL and UNIQUAC models, obtaining a maximum absolute error of 1%. Herrington
area test was performed using the criteria of Wisniak (1993) and Kojima et al
(2004).
Also, Van Ness test was used as modelling capability test for NRTL
and UNIFAC Dortmund models. Good thermodynamic consistency was found with both
tests. UNIFAC group contribution model was used to predict liquid phase activity
coefficients of the systems at pressures under study. Experimental data are in
good agreement with UNIFAC predictions. All data sets showed positive deviation
from ideality.

Thermodynamic
models here obtained can be applied in simulations for analysis and design in
processes involving the system investigated. An example for the application of these
models is the separation of Fusel Oil, a byproduct of the production of ethanol
from sugar cane. Experimental and simulated data are presented in Figure 1.   

Figure 1. Experimental and
simulated data with Aspen Plus using NRTL propertie package for Vapor-Liquid
Equilibrium of  Ethanol + Isoamyl Alcohol: (Triangle) Experimental data at 101.3
kPa, (circle) Experimental data at 50 kPa, (dashed line) simulated data at 101.3
kPa, (continuous line) simulated data at 50 kPa.

Keywords:
UNIFAC, NRTL, Consistency test, Fusel Oil.