Journal
BIORESOURCE TECHNOLOGY
Volume 131, Issue -, Pages 468-475Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.12.190
Keywords
Biodiesel; Macauba oil; Liquid-liquid equilibrium; Themodynamic modeling; Sensitivity analysis
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/56258-8]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [140362/2009-6]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/56258-8] Funding Source: FAPESP
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The aim of this study was to obtain experimental data related to liquid-liquid equilibrium (LLE) of systems containing glycerol + ethanol + ethyl biodiesel from macauba pulp oil, perform thermodynamic modeling and simulate the settling step of this biodiesel using simulation software. Binary interaction parameters were adjusted for NRTL and UNIQUAC models. The UNIFAC-LLE and UNIFAC-Dortmund models were used to predict the LLE of the systems. A sensitivity analysis was applied to the settling step to describe the composition of the output streams as a function of ethanol in the feed stream. Ethanol had greater affinity for the glycerol-rich phase. The deviations between experimental data and calculated values were 0.44%, 1.07%, 3.52% and 2.82%, respectively, using the NRTL, UNIQUAC, UNIFAC-LLE and UNIFAC-Dortmund models. Excess ethanol in the feed stream causes losses of ethyl ester in the glycerol-rich stream and high concentration of glycerol in the ester-rich stream. (C) 2013 Elsevier Ltd. All rights reserved.
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