Abstract
Dissolution of bagasse with 1-butyl-3-methylimidazolium chloride at high temperatures (110–160°C) is investigated as a pretreatment process for saccharification and fermentation based biofuel production. Material balances are reported and used along with enzymatic saccharification data to identify optimum pretreatment conditions (150°C for 90min). At all pretreatment temperatures, dissolved and reprecipitated material is enriched in cellulose, has a low crystallinity and the cellulose component is easily and quantitatively hydrolysed (100%, 3h, 15 FPU). At pretreatment temperatures⩽150°C, the undissolved material has only slightly lower crystallinity than the starting. At pretreatment temperatures⩾150°C, the undissolved material has low crystallinity and when combined with the dissolved material has a saccharification rate and extent similar to completely dissolved material. Complete dissolution is not necessary to maximise saccharification efficiency at temperatures⩾150°C.
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