首页|Soybean oil extraction using ethyl acetate and 1-butanol: From solvent selection to thermodynamic assessment
Soybean oil extraction using ethyl acetate and 1-butanol: From solvent selection to thermodynamic assessment
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Soybean oil extraction using two green solvents was investigated from solvent selection to thermodynamics: ethyl acetate and 1-butanol. The screening of the solvents was performed using the Hansen parameters and Infinite Dilution Activity Coefficient (IDAC) obtained through the COnductor-like Screening MOdels-Segment Activity Coefficient (COSMO-SAC) theory. The solvent selection was performed on ethyl acetate and 1-butanol in comparison with ethanol, a well-studied green solvent, and hexane, a non-renewable and industrially used solvent. The effects of temperature and solvent/solid ratio on the yield of soybean oil extraction were investigated through response surface methodology (RSM). The RSM obtained satisfactory statistical results, with R_(adj)~2 of 0.9958 for ethyl acetate and 0.9729 for 1-butanol. The kinetic of the extractions were evaluated using two different models: mass transfer kinetic and So and Macdonald. The last one obtained the best correlation to the data (R~2 > 0.9964). The thermodynamic assessment showed endothermic, and spontaneous processes for both solvents. 1-Butanol, ethyl acetate, and hexane have a better performance on the yield of soybean oil extraction than using ethanol; however, ethyl acetate is the best candidate to replace the industrial use of hexane due to its highest rate of soybean oil extraction at the process beginning.
Green solventsKinetic modelsRSMCOSMO-SACIDAC
Henrique Gasparetto、Ana Luiza Barrachini Nunes、Fernanda de Castilhos
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Chemical Engineering Department, Federal University of Santa Maria, Brazil
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