paper6

Experimental and theoretical study on liquid–liquid equilibrium of

1-butanol + water +NaNO

Fatemeh Pirahmadi, Mohammad Reza Dehghani

Bahman Behzadi, S. Mojtaba Seyedi, Hesamoddin Rabiee

Thermodynamics Research Laboratory, School of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran

a b s t r a c t

In this work liquid–liquid equilibria (LLE) in the system containing 1-butanol–water–sodium nitrate

at temperatures of 25 and 35

UNIQUAC model has previously been used for correlation of liquid–liquid equilibrium in aqueous salt

systems containing alcohols. In that model the excess Gibbs energy consists of two terms, the original

UNIQUAC term and Debye–Hückel term which considers the alcohol as a non-electrolyte solute. In this

work, a modified extended UNIQUAC model is used by taking into account mixed solvent theories. The

model consists of three terms, the original UNIQUAC term, a Pitzer–Debye–Hückel term and a Born term.

The model has been found to give a satisfactory description of LLE data obtained in this work, with an

average absolute deviation of less than 0.5 in calculated mass percent compared to experimental data.

© 2010 Elsevier B.V. All rights reserved.