Pretreatment of lignocellulosic biomass with 1-ethyl-3-methylimidazolium acetate for its eventual valorization by anaerobic digestion
EntityUAM. Departamento de Ingeniería Química
10.3390/resources10120118Resources 10.12 (2021): 118
ProjectGobierno de España. PID2019-108445RB-I00; Comunidad de Madrid. P2018/EMT-4344/BIOTRES-CM
SubjectsAnaerobic Digestion; Ionic Liquid Pretreatment; Lignocellulosic Waste; Thermal Pretreatment; Química
Rights© 2021 by the authors. Licensee MDPI, Basel, Switzerland
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
This study assessed the breakdown of lignocellulosic biomass (LB) with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]) as a pretreatment to increase the methane yield. The pretreatment was conducted for wheat straw (WS), barley straw (BS), and grape stem (GS) at 120◦C for 120 min, using several LB to [Emim][Ac] ratios (1:1, 1:3, and 1:5 w/w). Pretreatment significantly disrupted the lignocellulose matrix of each biomass into soluble sugars. GS showed the highest sugar yield, which was followed by WS, while BS was slightly hydrolyzed (175.3 ± 2.3, 158.2 ± 5.2, and 51.1 ± 3.1 mg glucose g–1 biomass, respectively). Likewise, the pretreatment significantly reduced the cellulose crystallinity index (CrI) of the resulting solid fractions of GS and WS by 15% and 9%, respectively, but slightly affected the CrI of BS (5%). Thus, BMP tests were only carried out for raw and hydrothermally and [Emim][Ac] (1:5) pretreated GS and WS. The untreated GS and WS showed similar methane yields to those achieved for the solid fraction obtained after pretreatment with an LB to [Emim][Ac] ratio of 1:5 (219 ± 10 and 368 ± 1 mL CH4 g–1 VS, respectively). The methane production of the solid plus liquid fraction obtained after IL pretreatment increased by 1.61-and 1.34-fold compared to the raw GS and WS, respectively
Google Scholar:Marin-Batista, Jose D. - Fernández Mohedano, Ángel - Rubia Romero, María de los Ángeles de la
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