Decomposition Behavior of Plant Biomass in Hot-Compressed Water

Ando, Hiroki; Sakaki, Tsuyoshi; Kokusho, Tetsuro; Shibata, Masao; Uemura, and Yoshimitsu; Hatate, Yasuo

doi:10.1021/ie0000257

Cited by 198 publications

(102 citation statements)

References 9 publications

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“…Coupling these results with the results from the XRD analysis, indicated that the majority of the cellulose in cypress was decomposed at the high temperatures (>280 °C). In a simple cypress decomposition mechanism, hemicelluloses would be the first to decompose at low temperatures (180 °C) followed by intermediate temperature lignin decomposition, while cellulose decomposes at relatively higher temperatures (>240 °C) [21,22]. Other important results are also summarized in Figure 4b, where xylose and galactose were not detected after 220 °C, while the arabinose and mannose were disappeared after 200 and 260 °C, respectively.…”

Section: Sugar Analysis Of Solid Residuementioning

confidence: 89%

Understanding the Mechanism of Cypress Liquefaction in Hot-Compressed Water through Characterization of Solid Residues

Liu

Yang

et al. 2013

Energies

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Abstract:The mechanism of hydrothermal liquefaction of cypress was investigated by examining the effects of temperature and retention time on the characteristics of the solid residues remaining after liquefaction. The solid residues were divided into acid-soluble and acid-insoluble residues. Results showed the polymerization reactions also mainly occurred at low temperatures. The reactive fragments transformed into acid-insoluble solid residue in the form of carbon and oxygen through polymerization reactions. The process of cellulose degradation consists of two steps: an initial hydrolysis of the more solvent-accessible amorphous region and a later hydrolytic attack on the crystalline portion. Hemicelluloses were decomposed into small compounds during the initial stage of the cypress liquefaction process, and then these compounds may rearrange through polymerization to form acid-insoluble solid residues above 240 °C. The higher heating value of the solid residues obtained from liquefaction at 260-300 °C was 23.4-26.3 MJ/kg, indicating that they were suitable for combustion as a solid fuel.

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Section: Sugar Analysis Of Solid Residuementioning

confidence: 89%

Understanding the Mechanism of Cypress Liquefaction in Hot-Compressed Water through Characterization of Solid Residues

Liu

Yang

et al. 2013

Energies

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“…A common trend among the bamboo, larch and mallee is that the fraction of HCEL (FHCEL) decreases monotonously with HTT due to hydrolysis of cellulose and hemicellulose. [15][16][17] HT temperature of 250-260°C seems to be high enough to convert the major portion of HCEL. The decrease in FHCEL is compensated by increases in the fractions of SOL (FSOL) and/or LIG (FLIG).…”

Section: Measurement Of Mechanical Strength Of Cokementioning

confidence: 99%

“…It is believed that heat treatment of biomass in hot-compressed water, that is, hydrothermal treatment (HT), is a most reasonable way of such chemical modification in a practical sense because water is used as the only reactive solvent for hydrolytic decomposition of cellulose and hemicellulose into sugar monomers/oligomers, [15][16][17] but without any chemical reagents. The hydrolytic decomposition of cellulose and hemicellulose occurs at 180°C and 230°C, respectively, or even at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrolytic decomposition of cellulose and hemicellulose occurs at 180°C and 230°C, respectively, or even at lower temperatures. [15][16][17] Lignin is less reactive in hot-compressed water than the other two components, 18,19) and its major portion is left in the residual solid. Knowledge on the mechanism of hydrothermal reactions of the lignin is much less compared with that for the cellulose and hemicellulose.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Coke from Hydrothermally Treated Biomass in Sequence of Hot Briquetting and Carbonization

et al. 2014

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A sequence of briquetting of biomass solids (bamboo, larch and mallee) at temperature and mechanical pressure of respectively, and carbonization at 900°C produces coke with tensile strength (TS) of 5-19 MPa. Introduction of heat treatment in hot-compressed water (i.e., hydrothermal treatment; HT) of the biomass prior to the briquetting increases TS up to 44, 57 and 42 MPa for the bamboo, larch and mallee, respectively. TS of coke is correlated well and positively with the coke/briquette bulk density ratio, and HT increases the ratio if operated under appropriate conditions. The efficacy of HT is attributed primarily to increase in the coke yield on a basis of the briquette mass. HT hydrolytically removes highly volatile cellulosic material (i.e., cellulose and hemicellulose), transforms it into solid that contributes to coke as effectively as lignin, and thereby increases the mass yield of coke by a factor of 1.4 to 2.1. HT also enhances the plasticizability of the biomass during the briquetting by degradation of the lignin to reasonable extent, and then promotes particles' coalescence/fusion and densification of the briquettes. Applying mechanical pressure over a range of 12-114 MPa to the briquetting of a solid from HT of the bamboo at 240°C successfully results in production of coke with TS of 41-44 MPa.

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“…The interfacial bonding of fiber-polymer can be improved by diminishing the hemicellulose component in the fiber (Han et al 2009;Eslam et al 2011;Hosseinaei et al 2012;Kaewkuk et al 2013). Hydrothermal and steam treatments such as superheated steam (SHS) (Bahrin et al 2012;Mahmud et al 2013;Then et al 2014), hot-water extraction (Eslam et al 2011;Hosseinaei et al 2012), and steam explosion (Ando et al 2000;Han et al 2009) reduce the hemicellulose content of fiber.…”

Section: Introductionmentioning

confidence: 99%

Superheated Steam Treatment of Oil Palm Mesocarp Fiber Improved the Properties of Fiber-Polypropylene Biocomposite

Nordin¹,

Ariffin²,

Hassan³

et al. 2016

BioResources

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The effect of fiber surface modification by superheated steam (SHS) treatment and fiber content (30 to 50 wt.%) was evaluated relative to the mechanical, morphology, thermal, and water absorption properties of oil palm mesocarp fiber (OPMF)/polypropylene (PP) biocomposites. SHS treatment of OPMF was conducted between 190 and 230 C for 1 h, then the SHS-treated fiber was subjected to melt-blending with PP for biocomposite production. The biocomposite prepared from SHS-OPMF treated at 210 C with 30 wt.% fiber loading resulted in SHS-OPMF/PP biocomposites with a tensile strength of 20.5 MPa, 25% higher than untreated-OPMF/PP biocomposites. A significant reduction of water absorption by 31% and an improved thermal stability by 8% at T5%degradation were also recorded. Scanning electron microscopy images of fractured SHS-OPMF/PP biocomposites exhibited less fiber pull-out, indicating that SHS treatment improved interfacial adhesion between fiber and PP. The results demonstrated SHS treatment is an effective surface modification method for biocomposite production.

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Decomposition Behavior of Plant Biomass in Hot-Compressed Water

Cited by 198 publications

References 9 publications

Understanding the Mechanism of Cypress Liquefaction in Hot-Compressed Water through Characterization of Solid Residues

Understanding the Mechanism of Cypress Liquefaction in Hot-Compressed Water through Characterization of Solid Residues

Preparation of Coke from Hydrothermally Treated Biomass in Sequence of Hot Briquetting and Carbonization

Superheated Steam Treatment of Oil Palm Mesocarp Fiber Improved the Properties of Fiber-Polypropylene Biocomposite

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