Desacidificação de oleos de babaçu e de algodão por extração liquido-liquido. / Babassu and cottonseed oils deacidification by liquid-liquid extraction.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The liquid-liquid extraction was used for babassu and cottonseed oil deacidification. For the babassu oil the study was performed based on the equilibrium data determined for systems containing refined babassu oil + lauric acid + ethanol + water at 30°C, varying the water concentration in the solvent (aqueous ethanol with 0.26; 5.57; 10.45; 20.29; 29.72 mass %). The increase of the water concentration resulted in an increase of the region of phases separation, decrease of the distribution coefficients (indicating a smaller capacity for the free fatty acids extraction by the solvent), and increase of the selectivity (indicating a lower loss of neutral oil). The NRTL parameters adjust showed the good description of the phases compositions as well as by the distribution coefficient and selectivity. On the other hand, the study for the cottonseed oil deacidification by liquid-liquid extraction was performed with the utilization of a perforated rotating discs contactor (PRDC), using azeotropic ethanol as a solvent. The experimental data was determined varying the rotating speed of the perforated discs (from 50 to 250 rpm) and the mass ratio oil:solvent (from 0.5:1 to 1.5:1) for the investigation of the feasibility of cottonseed oil continuous deacidification in a PRDC. The results showed that a higher discs rotating speed and a higher mass ratio oil:solvent (220 rpm and Md / Mc = 0.65) provided an oil with low free fatty acids concentration (0.29%), as recommended by ANVISA. This condition also presented free fatty acids extraction higher than 90% and loss of neutral oil lower than 4%. The experiments also indicated that 65 ? 90% from the tocopherol remained in the oil before the extraction process. Moreover, the mass transfer coefficients tends for higher values with the increase of the mass ratio oil:solvent and the increase of the discs rotating speed.

ASSUNTO(S)

liquid-liquid extraction desacidificação extração liquido-liquido oleo de caroço de algodão babassu oil cottonseed oils oleo de babaçu deacidification

ACESSO AO ARTIGO

Documentos Relacionados