| Titre : | Selective separation of tocopherol homologues by liquid-liquid extraction using ionic liquids (2009) |
| Auteurs : | Qiwei Yang, Auteur ; Huabin Xing, Auteur ; Yifeng Cao, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 48 N° 13, Juillet 2009) |
| Article en page(s) : | pp. 6417–6422 |
| Note générale : | Chemical engineering |
| Langues : | Anglais |
| Tags : | Pocopherol homologues Liquid-liquid extraction Ionic liquid |
| Résumé : | Selective separation of tocopherol homologues was performed by liquid−liquid extraction, using ionic liquids (ILs) as extractants in the presence of diluent. The distribution coefficients and selectivities of tocopherols in the biphasic system were determined. A selectivity of δ-tocopherol to α-tocopherol up to 21.3 was achieved when using [bmim]Cl as extractant diluted by methanol. Considering the structural differences of tocopherols, the separation mechanism based on the hydrogen-bonding interaction between IL’s anion and the −OH group on the tocopherols was proposed. The separation efficiency of IL was greatly affected by its anion, and followed the order [bmim]BF4 < [bmim]CF3SO3 < [bmim]Cl under the same conditions, which is consistent with the ascending order of IL’s hydrogen-bond basicity strengths. |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie801847e |
