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Fermentable Liquid Energy Carriers by Microwave-Assisted Hydrothermal Depolymerisation of Several Biomass Carbohydrates
Abstract This work addresses the production of fermentable liquid aqueous solutions by microwave-assisted hydrothermal treatment of cellulose and hemicellulose and alginic acid. A reactivity comparison was established at different temperatures (160–210 °C), reaction times (0 and 5 min) and solid/water ratios (1/20 and 1/10 g/g). The nature of the carbohydrates and the hydrothermal conditions exerted a significant influence on the reactivity, which increased as follows: cellulose < hemicellulose < alginic acid. The operating conditions did not influence the global conversion obtained during hydrothermal treatment of cellulose. Conversely, the temperature and reaction time played an important role when processing hemicellulose or alginic acid. In these two cases, increasing the temperature and/or reaction time increased the overall conversion and liquid and gas yields. The liquid hydrolysates were made up of a mixture of oligosaccharides (DP3–6 and DP > 6) and mono-/disaccharides, carboxylic acids, ketones and furans. While the chemical composition of the hydrolysates produced from hemicellulose was not affected by the microwave pre-treatment, all the liquids having a high concentration of DP > 6 oligosaccharides, the microwave conditions substantially influenced the composition of the liquids produced from cellulose and alginic acid. The former contained high proportions of oligosaccharides and saccharides, while the latter comprised water-soluble DP > 6 oligomers/oligosaccharides, saccharides, carboxylic acids and furans. The yeast Metschnikowia pulcherrima was used to assess the fermentability of the hydrolysates. All the hydrolysates were fermentable and their efficiency decreasing as follows: cellulose (high/low saccharides/inhibitors proportion) > hemicellulose (high/low oligosaccharides/inhibitors proportion) > alginic acid (low/high saccharides/inhibitors proportion).
Fermentable Liquid Energy Carriers by Microwave-Assisted Hydrothermal Depolymerisation of Several Biomass Carbohydrates
Abstract This work addresses the production of fermentable liquid aqueous solutions by microwave-assisted hydrothermal treatment of cellulose and hemicellulose and alginic acid. A reactivity comparison was established at different temperatures (160–210 °C), reaction times (0 and 5 min) and solid/water ratios (1/20 and 1/10 g/g). The nature of the carbohydrates and the hydrothermal conditions exerted a significant influence on the reactivity, which increased as follows: cellulose < hemicellulose < alginic acid. The operating conditions did not influence the global conversion obtained during hydrothermal treatment of cellulose. Conversely, the temperature and reaction time played an important role when processing hemicellulose or alginic acid. In these two cases, increasing the temperature and/or reaction time increased the overall conversion and liquid and gas yields. The liquid hydrolysates were made up of a mixture of oligosaccharides (DP3–6 and DP > 6) and mono-/disaccharides, carboxylic acids, ketones and furans. While the chemical composition of the hydrolysates produced from hemicellulose was not affected by the microwave pre-treatment, all the liquids having a high concentration of DP > 6 oligosaccharides, the microwave conditions substantially influenced the composition of the liquids produced from cellulose and alginic acid. The former contained high proportions of oligosaccharides and saccharides, while the latter comprised water-soluble DP > 6 oligomers/oligosaccharides, saccharides, carboxylic acids and furans. The yeast Metschnikowia pulcherrima was used to assess the fermentability of the hydrolysates. All the hydrolysates were fermentable and their efficiency decreasing as follows: cellulose (high/low saccharides/inhibitors proportion) > hemicellulose (high/low oligosaccharides/inhibitors proportion) > alginic acid (low/high saccharides/inhibitors proportion).
Fermentable Liquid Energy Carriers by Microwave-Assisted Hydrothermal Depolymerisation of Several Biomass Carbohydrates
Remón, Javier (author) / Santomauro, Fabio (author) / Chuck, Christopher J. (author) / Matharu, Avtar S. (author) / Clark, James H. (author)
2019-08-31
12 pages
Article/Chapter (Book)
Electronic Resource
English
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