Hydrothermal production of furfural from xylose and xylan as model compounds for hemicelluloses

Möller, Maria; Schröder, Uwe

doi:10.1039/c3ra43108h

Cited by 70 publications

(32 citation statements)

References 31 publications

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“…2d), the sugar amounts are extremely low, which could be explained by sugar degradation. Previous studies suggested that both glucose and xylose can be converted into other chemicals, such as levulinic acid, 5-hydroxymethylfurfural, humins [44,45], and furfural [46,47] under high temperature hydrothermal conditions.…”

Section: Resultsmentioning

confidence: 99%

Microwave assisted chemical pretreatment of Miscanthus under different temperature regimes

Zhu

Macquarrie

Simister

et al. 2015

Sustain Chem Process

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Background: Miscanthus is a major bioenergy crop in Europe and a potential feedstock for second generation biofuels. The most efficient and realistic method to produce fermentable sugars from lignocellulosic biomass is by enzymatic hydrolysis, assisted by thermo-chemical pretreatment. Recently, microwave technology has drawn growing attention, because of its unique effects and performance on biomass. Result: In this work, microwave energy was applied to facilitate NaOH and H 2 SO 4 pretreatment for Miscanthus under different temperatures (130-200 °C) for 20 min. The yields of reducing sugars from Miscanthus during the pretreatment process increased up to 180 °C and then declined with increasing temperature. Out results here showed a remarkable sugar yield from available carbohydrate (73 %) at the temperature of 180 °C by using 0.2 M H 2 SO 4. In comparison with conventional heating pretreatment studied at same temperature with same biomass material, the reducing sugar release in this study was 17 times higher within half the time. It was highlighted that the major sugar component could be tuned by changing pretreatment temperature or pretreatment media. Optimally, the glucose and xylose yield from available carbohydrate are 47 and 22 % by using 0.2 M H 2 SO 4 and NaOH respectively when temperature was 180 °C. The digestibility of pretreated Miscanthus was 10 times higher than that of untreated biomass. 68-86 % of the lignin content was removed from biomass by 0.2 M NaOH. Simultaneous saccharification fermentation (SSF) results showed an ethanol production of 143-152 mg/g biomass by using H 2 SO 4 /NaOH microwave assisted pretreatment, which is 7 times higher than that of untreated Miscanthus. Biomass morphology was studied by SEM, showing temperature has a strong influence on lignin removal process, as different lignin deposits were observed. At the temperature of 180 °C, NaOH pretreated biomass presented highly exposed fibres, which is a very important biomass characteristic for improved enzymatic hydrolysis. Conclusion: Compared to conventional pretreatment, microwave assisted pretreatment is more energy efficient and faster, due to its unique heating mechanism leading to direct interaction between the polar part of biomass and electromagnetic field. The results of this work present promising potential for using microwave to assist biomass thermo-chemical pretreatment.

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Section: Resultsmentioning

confidence: 99%

Microwave assisted chemical pretreatment of Miscanthus under different temperature regimes

Zhu

Macquarrie

Simister

et al. 2015

Sustain Chem Process

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“…These results are in close agreement with those reported by Möller and Schröder. 34 The decrease of furfural yield with a further increase in the reaction time can occur due to decomposition [35][36][37] and polymerization with char formation.…”

Section: Resultsmentioning

confidence: 99%

The role of xylulose as an intermediate in xylose conversion to furfural: insights via experiments and kinetic modelling

et al. 2015

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An experimental work has been performed to study the relevance of xylulose as an intermediate in xylose conversion to furfural in aqueous solution. The furfural formation was investigated at the temperature range from 180 to 220 C during non-catalyzed and acid-catalyzed conversion of xylose in a stirred microwaveassisted batch reactor. The separate experiments on xylulose and furfural conversions were carried out under similar conditions. The maximum furfural yields obtained from xylose were 48 mol% and 65 mol% for the non-catalyzed and the acid-catalyzed processes, respectively. It was shown that the furfural yield is significantly lower from xylulose than from xylose. Furthermore, the effects of initial xylose concentration and the formation of xylulose were investigated in a mechanistic modeling study. A new reaction mechanism was developed taking into account the xylulose formation from xylose. Based on the experimental results and the proposed reaction model, it was concluded that xylose isomerization to xylulose with subsequent furfural formation is not a primary reaction pathway. The obtained kinetic parameters were further used for plug flow reactor simulations to evaluate furfural yields achievable by an optimized continuous operation.

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“…Moller and Schroder investigated non-analyzed hydrothermal xylose degradation to furfural at temperature of 160-240 °C and reaction times of 5-240 min. 34 They proved that xylose conversion increased with reaction time and temperature. The maximal furfural yield was 49 %.…”

Section: Introductionmentioning

confidence: 99%

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 production of furfural from xylose and xylan as model compounds for hemicelluloses

Cited by 70 publications

References 31 publications

Microwave assisted chemical pretreatment of Miscanthus under different temperature regimes

Microwave assisted chemical pretreatment of Miscanthus under different temperature regimes

The role of xylulose as an intermediate in xylose conversion to furfural: insights via experiments and kinetic modelling

Hydrothermal treatment of sugars to obtain high-value products

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