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Optimization of Ionic Liquid Pretreatment of Mixed Softwood by Response Surface Methodology and Reutilization of Ionic Liquid from Hydrolysate
- Trinh, LyThi Phi, Lee, Young-Ju, Lee, Jae-Won, Lee, Won-Heong
- Biotechnology and bioprocess engineering 2018 v.23 no.2 pp. 228-237
- acetates, bioethanol, ethanol production, fermentation, hydrolysates, ionic liquids, response surface methodology, saccharification, softwood, sugars
- We investigated the feasibility of producing bioethanol from mixed softwood pretreated with the ionic liquid 1-butyl-3-methylimidazolium acetate ([Bmim]Ac). The optimal pretreatment conditions were determined by response surface methodology to be 100°C for 15 h, and the fermentable sugar yield was estimated to be 92.5%. Efficient pretreatment of softwood was maintained even after reutilizing [Bmim]Ac up to four times. Through the enzymatic saccharification and subsequent fermentation, bioethanol was produced with 0.42 g/g of yield and 0.24 g/L/h of productivity, which clearly suggests that efficient and economical bioethanol production can be achieved by optimizing pretreatment processes and reutilizing ionic liquid.