Kinetics of selective adsorption of impurities from a crude vegetable oil in hexane to activated earths and carbons

被引：31

作者：

Ribeiro M.H.L. ^{[1
]}

Lourenço P.A.S. ^{[2
]}

Monteiro J.P. ^{[2
]}

Ferreira-Dias S. ^{[2
]}

机构：

[1] Faculdade de Farmácia, 1600 Lisboa, Av Forças Armadas

[2] Instituto Superior de Agronomia, 1349-017 Lisboa, Tapada da Ajuda

来源：

European Food Research and Technology | 2001年 / 213卷 / 2期

关键词：

Activated carbon; Adsorption; Diatomaceous earths; Miscella; Vegetable oil;

D O I：

10.1007/s002170100347

中图分类号：

学科分类号：

摘要：

In this study, the selective removal of several impurities (chlorophylls and pheophytins, carotenoids, free fatty acids and oxidation products) from a solution of crude olive residue oil in n-hexane (miscella) by batch adsorption to different materials was investigated. The following adsorbents were tested: activated diatomaceous earths, powdered and granulated activated carbons. For the majority of the adsorbents used, both Freundlich and Langmuir isotherm models showed a good fit to the adsorption of pigments, free fatty acids (FFA), conjugated hydroperoxides (HP), and final oxidation products (FOP). Sigmoid profiles were observed for the adsorption of chlorophylls, carotenoids, and FOP to the 20-60 mesh carbon, suggesting the presence of pores in the intermediate range (2-50 nm). The FFA isotherm adsorption to the 8-20 mesh carbon can be explained by a multilayer adsorption phenomenon. On the basis of the estimated values for affinity and separation factors, the selective adsorption occurred in the following order for every adsorbent tested: chlorophylls and pheophytins>carotenoids>hydroperoxides>final oxidation products>free fatty acids. The highest adsorption efficiency was observed for the powdered activated carbon. © Springer-Verlag 2001.

引用

页码：132 / 138

页数：6

共 27 条

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