Abstract
Pretreatment is a vital process for the conversion of lignocellulose biomass into energy. The pretreatment process is known to enhance solubilization and dissociation of the complex lignocellulose structure. This study focused on efficacy of ionic liquid pretreatment, using 1-ethyl-3-methylimidazolium acetate (EMIM-Ac), of rice straw for sugar production in the comparison with acid and alkaline pretreatment. The results showed that EMIM-Ac pretreatment resulted in dramatic changes in chemical structures and microscopic morphology of rice straw. These observations were associated with the high levels of sugar production. Evaluation of EMIM-Ac recyclability demonstrated that absolute methanol was an anti-solvent to yield the higher sugar levels than water and acetone. In summary, these findings show that EMIM-Ac ionic liquid is the efficient method for rice straw pretreatment due to high sugar yields and recyclability.
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