Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion
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...
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MDPI AG
2021-11-01
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| Online Access: | https://www.mdpi.com/2079-9276/10/12/118 |
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| author | Jose D. Marin-Batista Angel F. Mohedano Angeles de la Rubia |
| author_facet | Jose D. Marin-Batista Angel F. Mohedano Angeles de la Rubia |
| author_sort | Jose D. Marin-Batista |
| collection | DOAJ |
| description | 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 <i>w/w</i>). 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<sup>–1</sup> 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 CH<sub>4</sub> g<sup>–1</sup> 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. |
| first_indexed | 2024-03-10T03:10:14Z |
| format | Article |
| id | doaj.art-011474b504c4471094a35a139430bd16 |
| institution | Directory Open Access Journal |
| issn | 2079-9276 |
| language | English |
| last_indexed | 2024-03-10T03:10:14Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
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| series | Resources |
| spelling | doaj.art-011474b504c4471094a35a139430bd162023-11-23T10:26:13ZengMDPI AGResources2079-92762021-11-01101211810.3390/resources10120118Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic DigestionJose D. Marin-Batista0Angel F. Mohedano1Angeles de la Rubia2Chemical Engineering Department, Campus de Cantoblanco, Universidad Autonoma de Madrid, 28049 Madrid, SpainChemical Engineering Department, Campus de Cantoblanco, Universidad Autonoma de Madrid, 28049 Madrid, SpainChemical Engineering Department, Campus de Cantoblanco, Universidad Autonoma de Madrid, 28049 Madrid, SpainThis 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 <i>w/w</i>). 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<sup>–1</sup> 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 CH<sub>4</sub> g<sup>–1</sup> 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.https://www.mdpi.com/2079-9276/10/12/118anaerobic digestionionic liquid pretreatmentlignocellulosic wastethermal pretreatment |
| spellingShingle | Jose D. Marin-Batista Angel F. Mohedano Angeles de la Rubia Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion Resources anaerobic digestion ionic liquid pretreatment lignocellulosic waste thermal pretreatment |
| title | Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion |
| title_full | Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion |
| title_fullStr | Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion |
| title_full_unstemmed | Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion |
| title_short | Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion |
| title_sort | pretreatment of lignocellulosic biomass with 1 ethyl 3 methylimidazolium acetate for its eventual valorization by anaerobic digestion |
| topic | anaerobic digestion ionic liquid pretreatment lignocellulosic waste thermal pretreatment |
| url | https://www.mdpi.com/2079-9276/10/12/118 |
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