Research Updates, Santalum|

Abstract

We have demonstrated that sandalwood can be dissolved in the ionic liquid 1,3-diethylimidazolium acetate ([C2C2im][OAc]) and that sandalwood oil can then be extracted from the sandalwood/[C2C2im][OAc] solutions using diethyl ether, which forms a biphasic system with the ionic liquid. The main components of the obtained sandalwood oil, as confirmed by GC–MS, NMR, and FTIR, are (Z)-α-santalol and (Z)-β-santalol. Pretreatment of the sandalwood with microwave irradiation or poly(ethylene glycol), the presence of polyoxometalate as the catalyst, and higher dissolution temperature all led to increased essential oil yield. After the extraction of the essential oil, carbohydrate-rich material and free lignin were regenerated from the wood/[C2C2im][OAc] solution, thus allowing an integrated process of separating all the major components of sandalwood, the biopolymers and the oil.

Reference: Chapter: Ionic Liquids for Better Separation Processes, Part of the series Green Chemistry and Sustainable Technology pp 121-133, 16 December 2015; Arvind Kumar, Hui Wang, Robin D. Rogers

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