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|Título:||Modelling adsorption of impurities from a vegetable oil in organic solution|
the use of blends of activated carbon and earths
|Citação:||BIOPROCESS ENGINEERING. - Vol. 22, n. 5 (MAY 2000), p. 407-412|
|Resumo:||In this study, the use of blends of activated powdered carbon and activated earths for the selective removal of several impurities (pigments, free fatty acids and oxidation products) directly from the solution of crude olive residue oil in n-hexane (miscella) was investigated. The optimization of batch adsorption process was carried out in a 30% oil miscella (the usual miscella concentration) via the Response Surface Methodology as a function of both the amount of total adsorbent (TA) and the percentage of activated earths (E) used in these blends with carbon. Both the adsorption of pigments (chlorophylls and carotenoids) and hydroperoxides was significantly affect-ed by TA and E (linear and/or quadratic terms). In addition, an interaction effect (TA x E) was observed on the reduction of the residual content of these compounds. However, for final oxidation products (FOP), no interaction effect (TA x E) was observed and only the linear terms of TA and E showed to be significant on the response. Tridimensional response surfaces, described by second order polynomials, were fitted to the experimental data points concerning the residual content of pigments and initial oxidation products in miscella. The adsorption of FOP was fitted to a flat surface. In organic solution, the selective batch adsorption to the blends of activated earths and carbon occurs in the following order: chlorophylls carotenoids hydroperoxides final oxidation products. In fact, the minimum values observed for residual contents of chlorophylls, carotenoids, hydroperoxides and final oxidation products, were, respectively, about 5, 11, 25 and 41%. The addition of mixtures of carbon with earths directly to the miscella showed to be more efficient than carbon or earths alone, similar to the observation in a solvent free classical bleaching.|
|Aparece nas colecções:||FF - Produção Científica 2000-2009|
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