Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/20289
Title: Measurement and Prediction of Densities of Vegetable Oils at Pressures up to 45 MPa
Author: Freitas, Samuel V. D.
Silva, Francisca A. e
Jose Pastoriza-Gallego, Maria
Pineiro, Manuel M.
Lima, Alvaro S.
Coutinho, Joao A. P.
Keywords: SUPERCRITICAL-FLUID EXTRACTION
FATTY-ACID METHYL
ETHYL-ESTERS
BIODIESEL
COMBUSTION
EMISSIONS
EQUATION
TEMPERATURE
VISCOSITIES
SOLUBILITY
Issue Date: 2013
Publisher: AMER CHEMICAL SOC
Abstract: This work addresses the measurement and modeling of the densities of seven vegetable oils (soybean, rapeseed, castor, palm, sunflower, Aleurites moluccana, and Jatropha curcas oils) at temperatures from (283.15 to 363.15) K and pressures from (0.1 to 45) MPa. The data measured here was correlated using the modified Tait-Tammann equation, and the data was used to evaluate the predictive abilities of the Halvorsen model, the fragment-based approach, and the revised GCVOL group contribution method. The results show that the models studied described well the experimental data, presenting not only stable deviations over the temperature range but also overall average relative deviations (OARD) of only (1.2, 0.34, and 1.1) %, respectively. An extension of the models here studied to high pressure is proposed. The models of Halvorsen, Zong, and revised GCVOL provide very good predictions of high-pressure densities with OARDs of (0.75, 1.04, and 0.41) %, respectively, with the deviations presenting just a slightly pressure-dependent with maximum deviations of less than 2.0 %.
Peer review: yes
URI: http://hdl.handle.net/10773/20289
DOI: 10.1021/je400474w
ISSN: 0021-9568
Publisher Version: 10.1021/je400474w
Appears in Collections:CICECO - Artigos



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