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Mathematical modeling and experimental esterification at supercritical conditions for biodiesel production in a tubular reactor

2018; Elsevier BV; Volume: 171; Linguagem: Inglês

10.1016/j.enconman.2018.06.108

1879-2227

Anderson Alles de Jesus, Domingos Fabiano de Santana Souza, Jackson Araújo de Oliveira, Marcell S. Deus, Maxwell Gomes da Silva, Elton Franceschi, Silvia Maria Egues, Cláudio Dariva,

Process Optimization and Integration

The non-catalytic esterification of oleic acid with supercritical ethanol was carried out in a tubular reactor at different temperatures (150–300 °C), molar ratios (1:1–6:1) and volumetric flow rates (0.001–0.005 dm3/min). The highest free fatty acid conversion was obtained at 300 °C, ethanol to oleic acid molar ratio of 6:1 and fixed pressure of 150 bar. A phenomenological axial dispersion model was developed to evaluate the intrinsic effects of the operating variables on the conversion of oleic acid to ethyl oleate. The density of the reaction mixture was estimated using the Peng-Robinson equation of state. Distinct experimental data set were used for parameter estimation and validation of the model. The results demonstrated that the correction of the flow velocity is necessary, and that the axial dispersion effect cannot be neglected.