Catalytic Fractionation of Raw Biomass to Biochemicals and Organosolv Lignin in a Methyl Isobutyl Ketone/H2O Biphasic System

A biphasic system, consisting of methyl isobutyl ketone and H2O, has been achieved for a highly integrated one-pot catalytic transformation and delignification process of lignocellulosic biomass. Using SO3H-functionalized ionic liquids as catalysts, 85.8% of bagasse can be fractionated into 71.4% water-soluble chemicals at 76.3% lignin extraction ratio, under the optimized conditions. The practicability of this biphasic system for other typical biomass sources has also been tested with high efficiency, viz., 79.6 to 91.9% lignin extraction ratio of corncob, corn stalk, rice husk, and rice straw with 56.6 to 72.8% water-soluble chemicals yield at 64.8 to 81.3% feed conversion.

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