Cellulose hydrolysis in subcritical and supercritical water

Sasaki, Mitsuru; Kabyemela, Bernard M.; Malaluan, Roberto M.; Hirose, Satoshi; Takeda, Naoko; Adschiri, Tadafumi; Arai, Kunio

doi:10.1016/s0896-8446(98)00060-6

Cited by 588 publications

(415 citation statements)

References 14 publications

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“…However, such a process involves the presence of strong acid catalysts or harsher processing conditions [27] [34][35][36][37]. When cellulose is hydrothermally treated in the absence of any additional catalysts and under mild processing conditions, its structure stays practically unaffected 21 below 180 o C. Above this temperature the cellulosic substrate generates an HTC material that possesses a well-developed aromatic nature (peak at 125-129 ppm) since the early stages of the reaction.…”

Section: Structural Differences Between Hydrothermal Carbons From Glumentioning

confidence: 99%

Morphological and structural differences between glucose, cellulose and lignocellulosic biomass derived hydrothermal carbons

2011

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Section: Structural Differences Between Hydrothermal Carbons From Glumentioning

confidence: 99%

Morphological and structural differences between glucose, cellulose and lignocellulosic biomass derived hydrothermal carbons

2011

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“…They found that around the critical point of water the hydrolysis rate jumped to a higher level by more than an order of magnitude becoming faster than the following glucose decomposition rate, and resulting in a high yield of glucose being obtained as a hydrolysis product. 40 Recently, the hydrolysis of cellulose to glucose was examined by Ichiyanagi et al 41 in high-pressure CO 2 without a catalyst (Scheme 8).…”

Section: Selective Hydrolysis Of Cellulosementioning

confidence: 99%

Development of materials and technologies for control of polymer recycling

Nishida

2011

Polym J

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The movement toward a recycling-based society through the essential development of recyclable materials alongside technologies for controlling recycling is reviewed. Recently, there has been progress in producing various polymers and technologies with the aim of achieving circulative utilization. For example, the upgrade recycling of commodity plastics, selective transformation of engineering plastics, selective depolymerization of various polymers in supercritical fluids, crosslinking-decrosslinking control using reversible reactions and developments in biomass-based recyclable polymers. Despite great strides taken in the effectiveness, efficiency and precision of these polymers and technologies, further improvements will be required to meet the practical requirements of a responsible sustainable system for the recycling of containers, packages, electric household appliances and end-of-life vehicles all of which are operated in compliance with the recycling laws of Japan.

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“…[21][22][23] For this reason,a lternate systems using significantly less catalyst have also been explored, including dilute acid hydrolysis [24,25] or hydrothermalb iomass depolymerization. [13,[26][27][28] However,a tm ost temperatures (below 510-570 K) and low acid contents( >3%), the rate of sugar degradation and dehydration to furans or other degradation products is of the same order of magnitude as the rate of polysaccharide depolymerization, especially for the cellulose fraction of biomass. [13,25,29,30] Therefore, both pure water and dilute acid systemsr equire impractical high-temperature and short-residence time processes to achieve high yields (e.g.,5 10-670K for minutes to seconds).…”

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Solvent‐Enabled Nonenyzmatic Sugar Production from Biomass for Chemical and Biological Upgrading

et al. 2015

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We recently reported an onenzymatic biomass deconstruction process for producing carbohydrates using homogeneous mixtures of g-valerolactone (GVL) and water as as olvent. Ak ey step in this process is the separation of the GVL from the aqueous phase, enabling GVL recycling and the production of ac oncentrated aqueous carbohydrate solution.I nt his study, we demonstrate that phenolic solvents-sec-butylphenol, nonylphenol, and lignin-derived propylg uaiacol-are effective at separating GVL from the aqueous phase using only small amountso fs olvent (0.5 gp er go ft he originalw ater,G VL, and sugar hydrolysate). Furthermore, using nonylphenol, we produced ah ydrolysate that supported robustg rowth and high yields of ethanol (0.49 gE tOH per gg lucose) at an industrially relevant concentration (50.8 gL À1 EtOH). These resultss uggest that using phenolic solvents could be an interesting solution for separating and/or detoxifying aqueous carbohydrate solutions produced using GVL-based biomass deconstruction processes.Lignocellulosic biomass is emerging as ap otentialr enewable feedstock to replace crude oil as as ource of fuels and commodity chemicals. For this reason,t argeted upgrading routes are being sought to convert biomass to these valuablep roducts. In this context, soluble carbohydrates are an attractive intermediate for biomass upgrading. By weight, structuralp olysaccharides typically represent between 60 and 80 wt %o f lignocellulosic biomass.I na ddition, many chemical [1][2][3][4] and biological [5][6][7][8] processes exist for upgrading carbohydrates to fuels and chemicals.Different strategies exist for deconstructing biomass hemicellulose (a polymer of C 5 sugars; mostly xylose) and cellulose (a polymer of cellobiose, ad imer of glucose) to their soluble counterparts. Concentrated mineral acids such as sulfuric or hydrochloric acid have been used to hydrolyze hemicellulose and cellulose to soluble oligomers almost quantitatively. [9][10][11][12][13] Recently,atwo-stage process consisting of at hermochemical or pretreatment stage followed by enzymatic hydrolysis has been one of the most prominently researched biomass depolymerization methods. [14][15][16][17] Both of these methods can achieve soluble carbohydrate yields upwards of 90 %a nd produce concentrated solutionso fc arbohydrates (> 100 gL À1 ). [10,13,18] Ionic liquids are also attractive solvents for cellulose dissolution and soluble carbohydrate production. [19,20] Although these processes can be used to produce sugars from biomass,t he cost of producing and/or recovering the enzyme, mineral acid, or solvent still represents as ignificant portion of the final process. [21][22][23] For this reason,a lternate systems using significantly less catalyst have also been explored, including dilute acid hydrolysis [24,25] or hydrothermalb iomass depolymerization. [13,[26][27][28] However,a tm ost temperatures (below 510-570 K) and low acid contents( >3%), the rate of sugar degradation and dehydration to furans or other degradation products is of the sam...

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Cellulose hydrolysis in subcritical and supercritical water

Cited by 588 publications

References 14 publications

Morphological and structural differences between glucose, cellulose and lignocellulosic biomass derived hydrothermal carbons

Morphological and structural differences between glucose, cellulose and lignocellulosic biomass derived hydrothermal carbons

Development of materials and technologies for control of polymer recycling

Solvent‐Enabled Nonenyzmatic Sugar Production from Biomass for Chemical and Biological Upgrading

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