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The Hildebrand solubility parameter (-value) was applied to explain the effect of organic solvent concentration on lignin removal during organosolv extraction of lignin from enzymatically hydrolyzed cornstalks under atmospheric pressure and low temperature ( 75 C) without additional catalyst. The -value of lignin, calculated using the groupcontribution method, was 13.70 (cal/cm 3 ) 1/2 . The proximity of the -value between organic solvent-water and lignin explained the delignification capacity of the organic solvent-water. The concentration of organic solvent in the aqueous mixture that led to the highest delignification (i.e., 34.5%, 41.8%, and 53.7% delignification for ethanol-water, 1,4-dioxanewater, and tetrahydrofuran-water, respectively) was around 65 to 75% vol., which was in keeping with the prediction by the solubility parameter theory.
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Ye et al. (2014) studied this question.
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