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Assessment of pretreatment temperature on the oil extraction from the vinification waste
Author(s) -
Johann Gracielle,
de Menezes Maraísa Lopes,
Pereira Nehemias Curvelo,
da Silva Edson Antonio
Publication year - 2018
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.13682
Subject(s) - extraction (chemistry) , water content , yield (engineering) , pulp and paper industry , pressing , chemistry , air temperature , process (computing) , moisture , environmental science , materials science , chromatography , engineering , composite material , computer science , biochemistry , geotechnical engineering , organic chemistry , climatology , geology , operating system
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%. Practical applications This article presents as contribution the filling of the scientific gap related to the evaluation of the drying kinetics and the influence of the drying temperature on the yield of grape seed oil content. For a practical application, our results revealed that the oil content was inversely proportional to the drying temperature of the grape seeds. Thus, considering the high costs related to the drying process, it can be concluded that the optimum temperature of drying the grape seeds must be directly related and the cost of energy and the oil content.