Department of Chemical Engineering, Faculty of Chemistry, University of Murcia, Campus of Espinardo, 30071 Murcia, Spain.
Bioresour Technol. 2010 Nov;101(21):8252-60. doi: 10.1016/j.biortech.2010.06.011. Epub 2010 Jul 1.
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.
研究了不同丙酮、乙醇和二氧六环-水混合物及条件（萃取时间和温度）下水解扁桃壳木质素的溶解度。溶解度参数（δ 值）的概念被应用于解释有机溶剂浓度对木质素溶解度的影响。在所研究的所有溶剂系列（丙酮、乙醇和二氧六环）中，导致木质素提取率最高的有机溶剂-水混合物由 75%体积的有机溶剂组成。此外，对于丙酮和乙醇系列，最佳的木质素提取条件是温度为 210°C，提取时间为 40 分钟，而对于二氧六环系列，最佳条件是提取时间为 25 分钟。计算了水解扁桃壳木质素[14.60（cal/cm(3))(1/2)]和有机溶剂-水混合物的δ 值。水有机溶剂的实际脱木质素能力清楚地反映了它们的δ 值与木质素的接近程度。还考虑了溶剂-水混合物的氢键能力。
