Liquid-liquid equilibrium data for the system composed of refined rice bran oil / anhydrous ethanol / water / hexane / Determinação de dados de equilibrio liquido-liquido de sistemas contendo oleo de farelo de arroz refinado / etanol anidro / agua / hexano

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The extraction of oil from rice bran aggregates value to the rice production. This oil has nutritional and nutraceutical properties, therefore, the interest of the industries in its use. The oil deacidification can be carried out by liquid¿liquid extraction with lower loss of neutral oil, mainly in the case of oil with high content of free fatty acid. In this process, a partially miscible solvent, such as ethanol or hydrated ethanol, is used to extract the free fatty acids from crude oils. Moreover, environmental and energy issues have focused attention to the use of vegetable oils in biodiesel production by transesterification reaction. The knowledge of the liquid¿liquid equilibrium of such fatty systems is an important stage in the optimization of the production of edible oil by liquid¿liquid extraction or the production of biodiesel by transesterification reaction. Thus, this work aims to determine experimental data from liquid-liquid equilibrium of systems containing refined rice bran oil / anhydrous ethanol / water / hexane at (298.15 and 313.15) K and to adjust the parameters of NRTL model to the experimental data. The technique of near infrared spectroscopy (NIR) was use to quantify the components in the phases. To avoid phase separation in sampling for system at 313.15 K, the dilution of the phases with tetrahydrofuran was investigate. All systems studied in this work presented overall mass balance deviations lower than 0.5 % and deviations in correlation by NRTL model lower than 1.0 %. These results indicate the good quality of the experimental data and that the NIR gives good results even when the components are in low content in the mixture

ASSUNTO(S)

oleo de farelo de arroz rice bran oil equilibrio liquido-liquido etanol espectroscopia no infravermelho proximo liquid-liquid equilibrium near infrared spectroscopy nrtl

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