Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 21, Pages 8252-8260Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.011
Keywords
Hydrolyzed almond shells; Organosolv lignin extraction; Extraction conditions; Solubility parameter theory
Funding
- Plant Biomass and Catalytic Processes research group of the University of Murcia (Spain)
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The solubility of lignin from hydrolyzed almond (Prunus amygdalus) shells in different acetone, ethanol and dioxane-water mixtures and conditions (extraction time and temperature) was studied. The concept of the solubility parameter (delta-value) was applied to explain the effect of organic solvent concentration on lignin solubility. The organic solvent-water mixture that led to the highest lignin extraction was composed of a 75% vol. of organic solvent for all the solvent series investigated (acetone, ethanol and dioxane). Moreover, the best lignin extraction conditions were a temperature of 210 degrees C and an extraction time of 40 min for the acetone and ethanol series, and 25 min for the dioxane series. The delta-value of the hydrolyzed almond shell lignin [14.60 (cal/cm(3))(1/2)] and that of the organic solvent-water mixtures was calculated. The experimental delignification capacity of the aqueous organic solvents clearly reflected the proximity of their delta-value to that of lignin. The hydrogen-bonding capacity of the solvent-water mixtures was also taken into account. (C) 2010 Elsevier Ltd. All rights reserved.
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