Abstract
Green solvents have been explored to replace the application of n-hexane and turn the extraction into a more sustainable process. In this work, oil was extracted from soybeans using terpene as the green solvent, and the technical feasibility of replacing n-hexane with p-cymene was evaluated for the first time. Insights into solvent selection were gained through Hansen solubility parameters and COSMO-SAC theory. Equilibrium extraction yields were assessed using response surface methodology, and each model was considered statistically significant. The kinetics and thermodynamics of the oil extraction were obtained and evaluated considering bias reduction, which was able to reduce the bias of the estimators, correct the probability confidence interval for the So and Macdonald model, and increase the determination coefficient for the thermodynamic assessment from 0.9387 to 0.9533. According to the results, p-cymene showed to be a technically feasible alternative to soybean oil extraction as it did not affect the typical oil quality and achieved better yields than n-hexane at 328.15 K.
Published Version
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