%0 Journal Article
%T Fractionation of pinus radiata wood by combination of steam explosion and organosolv delignification
%A Camila Mar¨ªa Imlauer-Vedoya
%A Esteban Revilla
%A Fernando Esteban Felissia
%A Juan Carlos Villar
%A Mar¨ªa Cristina Area
%A Priscila Vergara-Alarc¨®n
%J -
%D 2019
%X Abstract This work proposes a sequential combination of steam explosion and organosolv delignification for Pinus radiata fractionation. An efficient pretreatment to fully optimize the use of lignocellulosic materials is the key to make a biorefinery profitable, especially for softwoods, known to be more recalcitrant than other lignocellulosic raw materials. Steam explosion has a dual effect on biomass as morphological and chemical changes are introduced. A delignifying stage has been stated to be necessary in order to ease hydrolytic enzymes accessibility to cellulose while avoiding non-productive bonds with the lignin present. Three steam explosion conditions were tested (170¡ãC, 5 min; 180¡ãC, 10 min; 170¡ãC, 5+5 min) followed by an organosolv delignification stage, carried out at two different conditions (170¡ãC, 60 min; 170¡ãC, 90 min). All treatment yields, delignification extent, and hydrolysis yields were determined to evaluate each stage. The steam explosion treatment did not produce high delignification extent. Maximum global delignification (50.4%) was achieved when combining the two-cycle steam explosion with the most severe post-treatment condition tested. Enzymatic hydrolysis of the cellulosic residue improved after organosolv delignification; however, hydrolysis yields did not exceed 35%. The chemical changes undergone by softwood lignins are presumably responsible for the low digestibility
%K Biomass
%K enzymatic hydrolysis
%K lignins
%K pretreatment
%K radiata pine
%U http://revistas.ubiobio.cl/index.php/MCT/article/view/3566