Application of a Doehlert experimental design for optimizing the dioxane organosolv extraction of lignin from hydrolyzed almond shells

作者：Quesada Medina Joaquin^*; Olivares Carrillo Pilar; Javier Lopez Cremades Francisco

来源：Afinidad, 2011, 68(552): 107-115.

• Dioxane organosolv extraction
• Doehlert experimental design
• Hydrolyzed almond shells
• Lignin extraction conditions

The solubility of lignin from hydrolyzed almond (Prunus amygdalus) shells in 1,4-dioxane water mixtures (dioxane concentration, 0-100% vol.) and different extraction conditions [extraction temperature (150-230 degrees C) and cooking time (10-40 min)] was studied using a three-factor Doehlert experimental design. The most influenced variables in the organosolv process were the extraction temperature and the dioxane concentration; in the case of the delignification degree reached and the selectivity of the lignin extraction, both variables had a similar influence, while extractability was most influenced by the extraction temperature. The influence of cooking time was small in all the cases. Moreover, a significant dependence was observed between the extraction temperature and the optimum dioxane concentration of the mixture leading to maximum delignification, which was explained by solubility parameter theory and taking into account changes in both the extent of the association between lignin and carbohydrates and the degradation of the lignin structure.

• 出版日期2011-4