Preliminary tests were conducted to identify the time needed for the extraction processes to reach the equilibrium condition. It was identified that within the temperature range and types of solvents used, 2 h was sufficient to achieve the equilibrium. In these tests, higher temperatures and the addition of biodiesel to the ethanol favored the oil extraction. Thus, to study the effect of solvent to soybean ratio, the experiments of extraction at equilibrium were performed using those which presented the best and the worst operational conditions, it means, A= {55 ◦C, 90% anhydrous ethanol with 10% biodiesel (mass to mass)} and B = {25 ◦C, anhydrous ethanol}, respectively. To ensure that the extraction would
reach the equilibrium, the contact time between solvent and soybean was raised to 3 h. The extraction yield as a function of the solvent to soybean ratio is shown in Fig. 1
Preliminary tests were conducted to identify the time needed for the extraction processes to reach the equilibrium condition. It was identified that within the temperature range and types of solvents used, 2 h was sufficient to achieve the equilibrium. In these tests, higher temperatures and the addition of biodiesel to the ethanol favored the oil extraction. Thus, to study the effect of solvent to soybean ratio, the experiments of extraction at equilibrium were performed using those which presented the best and the worst operational conditions, it means, A= {55 ◦C, 90% anhydrous ethanol with 10% biodiesel (mass to mass)} and B = {25 ◦C, anhydrous ethanol}, respectively. To ensure that the extraction wouldreach the equilibrium, the contact time between solvent and soybean was raised to 3 h. The extraction yield as a function of the solvent to soybean ratio is shown in Fig. 1
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