| Journal: | Maderas : ciencia y tecnología |
| Database: | |
| System number: | 000534567 |
| ISSN: | 0718-221X |
| Authors: | Imlauer Vedoya, Camila María1 Vergara Alarcón, Priscila2 Area, María Cristina3 Revilla, Esteban4 Felissia, Fernando Esteban5 Villar, Juan Carlos6 |
| Institutions: | 1UNaM Instituto de Materiales de Misiones, Misiones. Argentina 2Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria Centro de Investigación Forestales, Madrid. España 3UNaM Instituto de Materiales de Misiones, Misiones. Argentina 4Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria Centro de Investigación Forestales, Madrid. España 5UNaM Instituto de Materiales de Misiones, Misiones. Argentina 6Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria Centro de Investigación Forestales, Madrid. España |
| Year: | 2019 |
| Volumen: | 21 |
| Number: | 4 |
| Pages: | 587-598 |
| Country: | Chile |
| Language: | Inglés |
| English 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°C, 5 min; 180°C, 10 min; 170°C, 5+5 min) followed by an organosolv delignification stage, carried out at two different conditions (170°C, 60 min; 170°C, 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. |
| Keyword: | Biomass, Enzymatic hydrolysis, Lignins, Pretreatment, Radiata pine. |
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