Desacidification of the oil of bran of rice for extration liquid-liquid. / Desacidificação do oleo de farelo de arroz por extração liquido-liquido.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The objective of this work was to evaluate the rice bran oil deacidification process by liquid-liquid extraction (LLE), in a continuous equipment, using aqueous ethanol as solvent. The alternative process was evaluated in terms of: ability to extract the free fatty acids; ability to minimize the neutral oil loss and, ability to preserve nutraceutical compounds, Y-oryzanol, tocopherols and tocotrienols, in the deacidified oil. The present work reports experimental equilibrium data for fatty systems containing rice bran oil, free fatty acids, Y-oryzanol, tocols, ethanol and water. These experimental data were used to adjust the interaction parameters of the NRTL and UNIQUAC models. The adjusted parameters allowed a quite successful prediction of liquid-liquid equilibrium for systems containing crude rice bran oil plus ethanolic solvent. The process variable influence on the losses/transfers of fatty compounds during the deacidification process were also investigated using the response surface methodology. Finally, the performance of a perforated rotating disc contactor was evaluated in the deacidification process. The mass transfer coefficients were obtained and the simulation of extraction process presented good agreement with experimental data. A extensively characterization of the oil deacidified by liquid extraction was done to evaluate the impact of extraction process on the quality of product obtained. The rice bran oil deacidified by LLE presented low level of free fatty acids (lower than 0.30 %, in mass) and high levels of nutraceutical compounds (580 ppm of tocopherols/tocotrienols and 1.3 % of Y-oryzanol, in mass). The losses of neutral oil (lower than 4%, in mass) and nutraceutical compounds were significantly lower than the results reported in the literature for alkali or physical refining of rice bran oil. These results indicate the feasibility of the total deacidification of edible oils by solvent extraction.

ASSUNTO(S)

farelo de arroz oil of rice vitamin e extration vitamina e balance liquid-liquid extration for solvent equilibrio liquido-liquido mass extração por solventes extração - equipamento massa - transferencia

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