Quantitative glucose release from softwood after pretreatment with low-cost ionic liquids
| Autor: | Clementine L. Chambon, Marius Biedka, Jason P. Hallett, Agnieszka Brandt-Talbot, Florence J. V. Gschwend, Paul S. Fennell |
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| Přispěvatelé: | Engineering & Physical Science Research Council (EPSRC) |
| Rok vydání: | 2019 |
| Předmět: |
EXTRACTION
Softwood LIGNOCELLULOSIC ETHANOL-PRODUCTION Chemistry Multidisciplinary engineering.material 010402 general chemistry 01 natural sciences complex mixtures PINE BIOMASS chemistry.chemical_compound Hydrolysis DISSOLUTION Environmental Chemistry Lignin Cellulose Green & Sustainable Science & Technology Dissolution Science & Technology 010405 organic chemistry Pulp (paper) TECHNOECONOMIC ANALYSIS Organic Chemistry Pollution HYDROLYSIS HARDWOOD 0104 chemical sciences Solvent Chemistry chemistry Ionic liquid Physical Sciences CELLULOSE engineering Science & Technology - Other Topics 03 Chemical Sciences Nuclear chemistry LIGNIN |
| Popis: | Softwood is an abundantly available feedstock for the bio-based industry. However, achieving cost-effective sugar release is particularly challenging, owing to its guaiacyl-only lignin. Here, we report the highly effective pretreatment of the softwood pine (Pinus sylvestris) using ionoSolv pretreatment, a novel ionic liquid-based lignocellulose fractionation technology. Three protic, low-cost ionic liquids, 1-butylimidazolium hydrogen sulfate, triethylammonium hydrogen sulfate and N,N-dimethylbutylammonium hydrogen sulfate, were used to fractionate the biomass into a carbohydrate-rich pulp and a lignin. The carbohydrate-rich pulp was hydrolysed into fermentable sugars by enzymatic saccharification. Under the most successful pretreatment conditions, quantitative glucose release from the pulp was achieved, which equates to a projected glucose release of 464 mg per gram of pine wood entering the process. We further intensified the process by increasing the solid to solvent ratio up to 1 : 2 g g−1 while maintaining saccharification yields of 75% of the theoretical maximum. We also demonstrate for the first time that N,N-dimethylbutylammonium hydrogen sulfate, [DMBA][HSO4], is an excellent low-cost pretreatment solvent, surpassing the pretreatment effectiveness of its symmetrically substituted analogue triethylammonium hydrogen sulfate. This shows that ionoSolv pretreatment with protic hydrogen sulfate ionic liquids is a truly feedstock-independent pretreatment option, further increasing the commercial potential of this pretreatment technology. |
| Databáze: | OpenAIRE |
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