3 years ago

Assessment of pretreatment temperature on the oil extraction from the vinification waste

Gracielle Johann, Edson Antonio da Silva, Maraísa Lopes de Menezes, Nehemias Curvelo Pereira


The study was carried out to determine the influence of hot air in drying process of grape seeds (Vitis labrusca) as well as in the oil extraction. The drying kinetics of the seeds was measured at different drying temperatures, ranging from 50 to 80 °C. The extraction experiments were conducted varying the operating pressure from 14 to 22 ton/cm 2. A phenomenological mathematical model of distributed parameters to describe the drying process was evaluated. The drying model was validated by comparison with experimental drying data and showed an average error of 2.2% in moisture profiles. In the pressing extractions experiments, the oil content was inversely proportional to the drying temperature of the seeds. The drying condition, which provided the maximum oil yield, was air temperature of 50 °C, in which the grape seed oil yield was 10%.

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