Abstract
Influence of organic biphasic pretreatment on levoglucosan (LG) yield from biomass pyrolysis was investigated with dilute sulfuric acid and dilute sodium hydroxide pretreatment as comparison, simultaneously, the mechanism was explored in depth. It was found that with monophasic (water) conditions, dilute sulfuric acid and dilute sodium hydroxide pretreatment, the yield of LG was all increase largely (from untreated 28% to treated 60–85%) due to the removal of hemicellulose or lignin. Phenoxyethanol was introduced to construct a biphasic system, and it showed that acid biphasic pretreatment of corncob followed by pyrolysis at 450 °C increased the LG yield to 91% and limited the formation of by-products, especially acids, ketones, and esters. In addition, it can easily realize the efficient recovery of the removed hemicellulose (75%) and lignin (49%). The different LG yields implied that removing lignin is more effective in increasing LG than removing hemicellulose. These findings provide instruction for the highly selective production of anhydrous sugars from biomass waste.
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