Two solid-phase recycling method for basic ionic liquid [C4mim]Ac by macroporous resin and ion exchange resin from Schisandra chinensis fruits extract

Journal of Chromatography B, Volumes 976–977, 22 January 2015, Pages 1-5

Chun-hui Ma, Yuan-gang Zu, Lei Yang, Jian Li

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Abstract

In this study, two solid-phase recycling method for basic ionic liquid (IL) 1-butyl-3-methylimidazoliumacetate ([C4mim]Ac) were studied through a digestion extraction system of extracting biphenylcyclooctene lignans from Schisandra chinensis. The RP-HPLC detection method for [C4mim]Ac was estab-lished in order to investigate the recovery efficiency of IL. The recycling method of [C4mim]Ac is dividedinto two steps, the first step was the separation of lignans from the IL solution containing HPD 5000macroporous resin, the recovery efficiency and purity of [C4mim]Ac achieved were 97.8% and 67.7%,respectively. This method cannot only separate the lignans from [C4mim]Ac solution, also improve thepurity of lignans, the absorption rate of lignans in [C4mim]Ac solution was found to be higher (69.2%)than that in ethanol solution (57.7%). The second step was the purification of [C4mim]Ac by the SK1Bstrong acid ion exchange resin, an [C4mim]Ac recovery efficiency of 55.9% and the purity higher than 90%were achieved. Additionally, [C4mim]Ac as solvent extraction of lignans from S. chinensis was optimized,the hydrolysis temperature was 90◦C and the hydrolysis time was 2 h.