Liquid–liquid equilibria for ethyl esters+ethanol+water systems: Experimental measurements and CPA EoS modeling

► Water washing of biodiesel is a very effective process to remove ethanol from ester phase. ► LLE data of water systems are important for design and operation of biodiesel purification process. ► The ethanol mass fraction in the aqueous phase is much larger than in the ester phase. ► Global deviati...

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Bibliographic Details
Published in:Fuel (Guildford) 2012-06, Vol.96, p.327-334
Main Authors: Follegatti-Romero, Luis A., Oliveira, Mariana B., Batista, Eduardo A.C., Coutinho, João A.P., Meirelles, Antonio J.A.
Format: Article
Language:English
Subjects:
Applied sciences
Biodiesel
Biodiesel washing
CPA EoS
Energy
Energy. Thermal use of fuels
Equations of state
Ethanol
Ethyl alcohol
Ethyl esters
Exact sciences and technology
Fatty acid ethyl esters
Fatty acids
Fuels
Liquid-liquid equilibria
Liquid–liquid equilibrium
Mathematical models
Water
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Summary:► Water washing of biodiesel is a very effective process to remove ethanol from ester phase. ► LLE data of water systems are important for design and operation of biodiesel purification process. ► The ethanol mass fraction in the aqueous phase is much larger than in the ester phase. ► Global deviations below 3.1% with CPA EoS. ► Transferability of CPA binary parameters to predict LLE of biodiesel systems. The knowledge and the capacity to describe the liquid–liquid equilibria of systems composed of fatty acid ethyl esters, ethanol and water are crucial for an adequate design of the biodiesel washing units found in the ethylic biodiesel production processes. Since limited data is available for systems of this kind, in this work measurements were carried out for fatty acid ethyl esters+ethanol+water systems containing some of the fatty acid ethyl esters most commonly found in biodiesels: ethyl linoleate+ethanol+water at 313.15K, technical grade ethyl oleate+ethanol+water at 298.15K and ethyl palmitate+ethanol+water at 298.15, 308.15 and 333.15K. The experimental data were predicted with the Cubic-Plus-Association equation of state (CPA EoS). Using temperature independent interaction parameters, obtained from binary data, this equation of state was able to provide a very good prediction of the phase diagrams of the studied systems, with average global deviations of only 3.09%.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2011.12.056