Hydrothermal Degradation of Cellulose at Temperature from 200 to 300 °C

Gagić, Tanja; Perva-Uzunalić, Amra; Knez, Željko; Škerget, Mojca

doi:10.1021/acs.iecr.8b00332

Cited by 56 publications

(40 citation statements)

References 49 publications

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“…From the results, it can be concluded that starch is a part of the chestnut bark, because its degradation leads to the formation of maltose [ 30 ]. Furthermore, glucose and fructose are probably cellulose degradation products [ 31 ], while arabinose is obtained from hemicellulose degradation [ 32 ]. Glucose and arabinose were also detected in chestnut shell extracts obtained by hydrothermal extraction [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Subcritical Water Extraction of Chestnut Bark and Optimization of Process Parameters

2020

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The aim of the work was the optimization of the subcritical water extraction process of chestnut bark using Box–Behnken response surface methodology. The influence of process parameters, such as temperature, extraction time and solvent-solid ratio, on extraction yield, yield of the main compounds, total phenol content, total tannin content and antioxidant activity has been investigated. The identified compounds were ellagic and gallic acids, ellagitannins (vescalagin, castalagin, 1-o-galloyl castalagin, vescalin and castalin), sugars (maltose, glucose, fructose and arabinose) and sugar derivatives (5-HMF, furfural and levulinic acid). Finally, the optimal process conditions for obtaining the bark extract highly rich in ellagic acid and with satisfactory levels of total phenols and total tannins have been determined.

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Section: Resultsmentioning

confidence: 99%

Subcritical Water Extraction of Chestnut Bark and Optimization of Process Parameters

2020

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“…At 160 °C, glucose starts to get converted to hydrochar, which is in agreement with other studies that mention that the conversion of hemicellulose during hydrothermal carbonization starts between 160 °C and 180 °C [ 32 , 34 , 35 ]. In addition, several studies [ 32 , 36 , 37 ] showed that, at 200 °C, the cellulose structure starts to get degraded and consequently converted into hydrochar. Moreover, the conversion of biomass into char by hydrothermal treatment can proceed via two different pathways.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Conversion of Spent Sugar Beets into High-Value Platform Molecules

et al. 2020

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The growing importance of bio-based products, combined with the desire to decrease the production of wastes, boosts the necessity to use wastes as raw materials for bio-based products. A waste material with a large potential is spent sugar beets, which are mainly used as animal feeds or fertilizers. After hydrothermal treatment, the produced chars exhibited an H/C ratio of 1.2 and a higher heating value of 22.7 MJ/kg, which were similar to that of subbituminous coal and higher than that of lignite. Moreover, the treatment of 25 g/L of glucose and 22 g/L of fructose by heating up to 160 °C led to a possible application of spent sugar beets for the production of 5-hydroxymethylfurfural. In the present study, the maximum concentration of 5-hydroxymethylfurfural was 3.4 g/L after heating up to 200 °C.

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“…The hydrothermal degradation of sugars was carried out in a 75 mL batch reactor (series 4740 stainless steel, Parr instruments, Moline, IL, USA) and the experimental setup is presented in our previous work. 43 Based on the results of our previous study of hydrothermal degradation of cellulose, 43 the temperature of 250 °C and reaction time of 1, 5 and 15 min were chosen for hydrothermal degradation of sugars. Namely, the results of this study showed that the important compounds such as 5-HMF, furfural and organic acids were at these con-ditions formed in high amounts.…”

Section: Hydrothermal Degradation Of Sugarsmentioning

confidence: 99%

“…The water-soluble phase was analyzed by HPLC. Based on previous work of cellulose degradation at subcritical water conditions, 43 the acetone was used to collect phenols, alkenes, alkanes, aldehydes, ketones, carboxylic acids, alcohols, esters, furans and high molecular compounds. Char was dried in an oven.…”

Section: Hydrothermal Degradation Of Sugarsmentioning

confidence: 99%

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Hydrothermal treatment of sugars to obtain high-value products

Gagić

Perva-Uzunalić

Knez

et al. 2020

JSCS

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In the present work, the degradation of different sugars, such as lactose, cellobiose, sucrose, galactose, glucose, fructose and xylose, was performed in batch reactor with subcritical water at temperature of 250 °C and reaction time of 1, 5 and 15 min. The yields of water-soluble phase, acetonesoluble phase, solid residue and gases were determined. The influence of reaction time and difference in sugar structure on the yield of phases and conversion of sugars was studied. Sugars with keto-and furanose structures were less stable than aldo-and pyranose-sugars. The most stable sugars were aldo-hexoses (galactose and glucose). The water-soluble fraction, which is composed of sugars and their derivatives, was analyzed by HPLC using RI and UV detectors. The detected degradation products by HPLC were:

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Hydrothermal Degradation of Cellulose at Temperature from 200 to 300 °C

Cited by 56 publications

References 49 publications

Subcritical Water Extraction of Chestnut Bark and Optimization of Process Parameters

Subcritical Water Extraction of Chestnut Bark and Optimization of Process Parameters

Hydrothermal Conversion of Spent Sugar Beets into High-Value Platform Molecules

Hydrothermal treatment of sugars to obtain high-value products

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