RESEARCH ARTICLE


Thermodynamic Modeling of High-pressure Equilibrium Data for the Systems L-lactic Acid + (Propane + Ethanol) and L-lactic Acid + (Carbon Dioxide + Ethanol)



Isabel C. N. Debiena, Aline A. Rigob, Marcos L. Corazzac, Marcio A. Mazuttid, J. Vladimir OliveiraeM. Angela A. Meirelesa, *a*
a DEA/FEA (School of Food Engineering)/UNICAMP, Campinas, 13083-862, SP, Brazil
b Department of Food Engineering, URI - Campus de Erechim, Erechim, RS, 99700-000, Brazil
c Department of Chemical Engineering, Polytechnic Center/UFPR, 82530-990, Curitiba, PR, Brazil
d Department of Chemical Engineering, UFSM, Santa Maria, RS, 97105-900, Brazil
e Department of Chemical Engineering, Polytechnic Center/UFPR, 82530-990, Curitiba, PR, Brazil


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Creative Commons License
© 2015 Debien et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the DEA/FEA (School of Food Engineering)/UNICAMP, Campinas, 13083-862, SP, Brazil; Tel.: +55-19-35214033; Fax: +55-19-35214027; E-mail: meireles@fea.unicamp.br


Abstract

This short communication reports the thermodynamic modeling of high-pressure equilibrium data (cloud points) for the systems L-lactic acid + (propane + ethanol) and L-lactic acid + (carbon dioxide + ethanol) from 323.15 K to 353.15 K and at pressures up to 25 MPa.The experimental data were modeled using the Peng-Robinson equation of state with the classical van der Waals quadratic mixing rule (PR-vdW2) and with the Wong-Sandler mixing rule (PR-WS). It is shown that the PR-vdW2 and PR-WS models were both able to satisfactorily represent the phase behavior of the system L-lactic acid + (carbon dioxide + ethanol). However, for the system L-lactic acid + (propane + ethanol), the PR-vdW2 model was not able to appropriately describe its phase behavior.

Keywords: Carbon dioxide, ethanol, L-lactic acid, phase equilibrium, propane, thermodynamic modeling.