Dehydration of d-glucose in high temperature water at pressures up to 80MPa

Aida, Taku Michael; Sato, Yukiko; Watanabe, Masaru; Tajima, Kiyohiko; Nonaka, T.; Hattori, Hideo; Arai, Kunio

doi:10.1016/j.supflu.2006.07.027

Cited by 244 publications

(145 citation statements)

References 29 publications

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“…The reaction path scheme of glucose to the primary decay products is reported by several researchers 39,43,[45][46][47]54,62,63,66,70,71 (see Figure 8a). …”

Section: Reaction Path Model and Kineticsmentioning

confidence: 73%

“…Primary and small secondary/tertiary decomposition products of glucose conversion in hot compressed water were identified by a number of researchers. 22,23,39,43,46,47,53,[58][59][60][61][62][63][64][65][66] In the capillaries, gas yields and compositions of these components were determined. Formation of WSIS was observed by visual inspection and is, thus, only indicative.…”

Section: Gasmentioning

confidence: 99%

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Hydrothermal conversion of biomass

Knežević¹

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“…The reaction path scheme of glucose to the primary decay products is reported by several researchers 39,43,[45][46][47]54,62,63,66,70,71 (see Figure 8a). …”

Section: Reaction Path Model and Kineticsmentioning

confidence: 73%

Section: Gasmentioning

confidence: 99%

Hydrothermal conversion of biomass

Knežević¹

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“…But due to the stability of cotton fiber structure and limited hydronium ions, only some cotton can give rise to monosaccharides, other parts of the chain form oligomers [24] [25]. Monosaccharides and oligomers reacted along different paths: (ⅰ) Glucose splitting into four-carbon sugar, phloroglucinol, furan, organic acids, aldehydes and so on [26] [27]. These substances formed soluble polymer by intermolecular dehydration and aromatization.…”

Section: Chemical Characteristics Of Hydrothermal Carbonization Productsmentioning

confidence: 99%

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Shi¹,

Zhang²,

Zhang³

et al. 2017

Preprint

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Abstract：In order to study the hydrothermal behavior of cotton fiber, the carbonization process and structural evolution of discarded cotton fiber (WCF) under hydrothermal conditions were discussed use microcrystalline cellulose (MCC) and glucose as model compounds. The results showed that high temperature was beneficial to the hydrolysis of discarded cotton fiber, and the yield of the sugar was 4.5% which was lower than that of MCC 6.51%.WFC and MCC are carbonized in 240~260 ℃ and 220~240 ℃ respectively, while the carbonation temperature of glucose is lower than 220 ℃. The quality ratio of C/O in WCF and glucose hydrothermal products is 5.79 and 5.85 respectively; three kinds of hydrothermal carbonization products have similar crystal structure and oxygen-containing functional groups, and the WCF carbonization products contain a lot of irregular particles while the main products of glucose carbonization are 0.5 μm carbon microspheres (CMCC). The results show that glucose is an important intermediate product of WCF hydrolysis carbonation, and there are two main paths of cotton fiber hydrothermal carbonization: some cotton fibers are completely hydrolyzed into glucose and the nucleation is formed, and then the carbon microspheres are grown; for the other part, the glucose ring of the polysaccharide oligosaccharide formed by the incomplete hydrolysis of cotton fiber in the hydrothermal environment of high temperature and pressure breaks, then forms the particulate matters.

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“…Furthermore Jacobsen and Wyman [29] showed that hydrothermal conversion of hemicellulose involves a similar hydrolytic reaction pathway than for cellulose with a higher reactivity due to the amorphous hemicellulose structures. Studies on the hydrothermal conversion of pentose and hexose monosaccharides show that they exhibit both similar reactivities [15][16][17]. They are simultaneously dehydrated to form substituted aromatic compounds such as furan and benzentriol and also fragmented by retro-aldol splitting to mainly oxygenated aliphatic compounds such as hydroxycarbonyls and carboxylic acids.…”

Section: Reaction Pathwaymentioning

confidence: 99%

“…The approach that can be carried out to simplify the reaction pathway investigation consists in studying transformation of compounds representative of lignocellulosic constituents (i.e. saccharidic and phenolic compounds) [15][16][17][18][19][20][21][22][23][24]. Nevertheless, hydrothermal conversion of lignocellulosic model compounds, even from simple compounds such as glucose or catechol, generates also complex mixtures of products whose complete characterization is an analytical challenge.…”

Section: Introductionmentioning

confidence: 99%

Correspondence Between Structure and Reactivity During Hydrothermal Conversion of Lignocellulosic Macromolecules

Barbier

Charon

Dupassieux

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Relation entre la structure et la re´activite´en conversion hydrothermale des macromole´cules de lignocellulosique -Ce travail porte sur l'e´tude des voies re´actionnelles accompagnant la lique´faction thermochimique du bois et de ses constituants lignocellulosiques lors d'un traitement hydrothermal. Pour ce faire, une approche analytique multi-technique originale combinant des me´thodes chromatographiques et spectroscopiques comple´mentaires a e´te´de´veloppe´e afin de caracte´riser les structures et les masses mole´culaires des produits. Les re´sultats obtenus montrent que la fraction holocellulosique et la fraction ligneuse de la biomasse ont des re´activite´s tre`s diffe´rentes. Bien que les deux mate´riaux re´agissent selon des sche´mas re´actionnels complexes faisant intervenir de nombreuses voies de fragmentation et de condensation compe´titives, la fraction holocellulosique re´agit par une premie`re e´tape de fragmentation suivie de la condensation des fragments ge´ne´re´s alors que la lignine re´agit principalement par de´polyme´risation partielle. Au cours de la lique´faction de la biomasse lignocellulosique, les compose´s provenant de la transformation des fractions holocellulosique et ligneuse se trouvent en contact les uns avec les autres dans le milieu hydrothermal et re´agissent ensemble pour former des produits de condensation.Abstract -Correspondence Between Structure and Reactivity During Hydrothermal Conversion of Lignocellulosic Macromolecules -In this study, reaction pathway of a woody biomass under hydrothermal conditions is investigated in order to further understand reactions that occur during the thermochemical liquefaction of a lignocellulosic biomass. A multitechnique analytical approach combining chromatographic and spectroscopic techniques has been developed in order to characterize both chemical structure and molecular weight of the products. From our experiments, we can assume that the holocellulosic and the ligneous fractions of biomass have different reactivity under hydrothermal condition. Although hydrothermal conversion of holocellulose and lignin occur both according to a complex pathway composed of competitive fragmentation and condensation reactions, holocellulose reacts first by total fragmentation to low molecular weight compounds followed by the condensation of the fragment to heavy molecular weight compounds, whereas lignin reacts essentially

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Dehydration of d-glucose in high temperature water at pressures up to 80MPa

Cited by 244 publications

References 29 publications

Hydrothermal conversion of biomass

Hydrothermal conversion of biomass

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Correspondence Between Structure and Reactivity During Hydrothermal Conversion of Lignocellulosic Macromolecules

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