Advanced Biorefinery based on the Fractionation of Biomass in γ‐Valerolactone and Water

Fang, Wenwen; Sixta, Herbert

doi:10.1002/cssc.201402821

Cited by 82 publications

(88 citation statements)

References 17 publications

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“…The GVL content should not exceed a level at which lignin fragmentation discontinues, but should also not be too low to diminish the dissolution of lignin. This fact was proven practically in the work by Fang et al., in which birch (another type of hardwood) sawdust was treated at an elevated temperature in GVL/water mixtures of different concentration, with a liquor/wood ratio (L/W) of 10 L kg −1 . As mentioned earlier, pure GVL can dissolve an equal amount of lignin (i.e., 50 % lignin solution); however, it does not promote delignification owing to the absence of the hydrolytic cleavage reaction .…”

Section: Resultsmentioning

confidence: 91%

“…This fact was proven practically in the work by Fang et al., in which birch (another type of hardwood) sawdust was treated at an elevated temperature in GVL/water mixtures of different concentration, with a liquor/wood ratio (L/W) of 10 L kg −1 . As mentioned earlier, pure GVL can dissolve an equal amount of lignin (i.e., 50 % lignin solution); however, it does not promote delignification owing to the absence of the hydrolytic cleavage reaction . The greatest extent of delignification was found at a GVL concentration between 50 and 65 wt %, well below the optimum solubility concentration determined in this work.…”

Section: Resultsmentioning

confidence: 91%

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Solubility of Organosolv Lignin in γ‐Valerolactone/Water Binary Mixtures

et al. 2016

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The solubility of lignin in a mixture of γ-valerolactone (GVL) and water at different weight ratios was measured using the Hildebrand solubility parameters. Based on the molecular structure of lignin, its solubility parameter (δ-value) was calculated as 25.5 MPa . The δ-value for aqueous GVL solvent increased from 23.1 MPa for pure GVL to 45.6 MPa for pure water. Therefore, the lignin solubility was predicted to increase with increasing GVL concentration in the aqueous mixture up to approximately 92-96 wt % of GVL. A ternary diagram describing the phase behavior of water-GVL-lignin mixtures at room temperature was constructed based on the experimental results. The three-component system exhibited a complex behavior with a liquid-liquid and solid-liquid-liquid phase split. The efficiency of the selected fractionation trials in a previous work was validated using the ternary solubility diagram. A promising recovery pathway and lignin isolation method were deduced from the results of this work.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 91%

Solubility of Organosolv Lignin in γ‐Valerolactone/Water Binary Mixtures

et al. 2016

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“…A comparison of lignin removal through aqueous dilute acid and acidic organic solvent based pretreatments demonstrates that the solvent typically leads to a significant increase in lignin removal, ranging from <20 to >70 % . A substantial number of organic solvents have been employed to solubilize lignin, including alcohols (e.g., ethanol, methanol, ethylene glycol,), 1,4‐dioxane, tetrahydrofuran (THF), γ‐valerolactone (GVL), and acids (formic acid, acetic acid). Additionally, H 2 O is usually adopted to pretreat lignin because of its environmentally friendly properties .…”

Section: Introductionmentioning

confidence: 99%

Performances of Several Solvents on the Cleavage of Inter‐ and Intramolecular Linkages of Lignin in Corncob Residue

Zhang

et al. 2018

ChemSusChem

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The performances of solvents, including γ-butyrolactone (GBL), γ-valerolactone (GVL), tetrahydrofuran (THF), ethyl acetate (EAC), 2-methyltetrahydrofuran (2-MeTHF), and the corresponding mixtures with H O, on the cleavage of inter- and intramolecular linkages of lignin in corncob residue were investigated. At 200 °C, miscible cosolvents (H O-GBL, H O-GVL, and H O-THF) exhibited much better efficiency for lignin dissolution than that of both immiscible cosolvents (H O-EAC and H O-2-MeTHF) and pure solvents. The synergetic effect between H O and organic solvent significantly promoted the breakage of intermolecular linkages between C6-O-H of amorphous cellulose and lignin. GBL and THF solvents preferentially dissolved lignin with H and G units, whereas GVL, EAC, and 2-MeTHF solvents exhibited high selectivity for the dissolution of lignin with S and G units. In addition to dissolution, the intramolecular β-O-4 linkage in lignin could be selectively cleaved in H O-GBL cosolvent, whereas the β-O-4, α-O-4, and β-5 linkages were cleaved in H O-EAC, H O-THF, and H O-2-MeTHF cosolvents. At 300 °C, the breakage of the β-γ bond prior to β-O-4 in H O-GBL, H O-THF, H O-EAC, and H O-2-MeTHF produced 4-ethylphenol and 4-ethylguaiacol selectively (accounting for ≈70 % of the total identified monophenols), whereas the α-1 bond was preferably broken in H O-GVL to form guaiacol (accounting for ≈75 % of the total identified monophenols).

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“…for phenolic compounds (Loow et al 2017). Fractionation of lignocellulose using aqueous γvalerolactone (GVL) has been recently developed (Fang, Sixta 2015;Luterbacher et al 2014). In addition to its ability to dissolve lignin, GVL promotes hydrolysis of polysaccharides by reducing the activation energy of glycosidic bond cleavage during pretreatment (Mellmer et al 2014a, b).…”

Section: Pretreatments Using Novel Delignification Solventsmentioning

confidence: 99%

Structural changes of lignin in biorefinery pretreatments and consequences to enzyme-lignin interactions

Sipponen¹,

Rahikainen²,

Leskinen³

et al. 2019

[Set Bioenergy, Vol. 1+2]

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Please cite the original version:Sipponen, M., Rahikainen, J., Leskinen, T., Pihlajaniemi, V., Mattinen, M-L., Lange, H., ... Österberg, M. (2017). Structural changes of lignin in biorefinery pretreatments and consequences to enzyme-lignin interactions. ABSTRACT:The main target of a biorefinery pretreatment process is to break down the ligninreinforced plant cell wall structure prior to enzymatic hydrolysis of polysaccharides to fermentable sugars. Various physico-chemical alterations occur in lignin during the biomass pretreatment, but effects of those structural changes on subsequent enzymatic hydrolysis have remained ambiguous. We review the reinforcing and detrimental lignin-enzyme interactions and their underlying mechanisms, and use this structure-function information to assess critical features of current and emerging pretreatment technologies. Our perspective is that truly multidisciplinary research is needed to develop pretreatments that render lignin non-inhibiting to enzymes and with high potential for further valorisation. ADDRESSES OF THE AUTHORS: Mika HenrikkiSipponen (mika.sipponen@aalto.fi), Timo Leskinen (timo.leskinen@aalto.fi), Maija-Liisa Mattinen (maijaliisa.mattinen@aalto.fi), Monika Österberg

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Advanced Biorefinery based on the Fractionation of Biomass in γ‐Valerolactone and Water

Cited by 82 publications

References 17 publications

Solubility of Organosolv Lignin in γ‐Valerolactone/Water Binary Mixtures

Solubility of Organosolv Lignin in γ‐Valerolactone/Water Binary Mixtures

Performances of Several Solvents on the Cleavage of Inter‐ and Intramolecular Linkages of Lignin in Corncob Residue

Structural changes of lignin in biorefinery pretreatments and consequences to enzyme-lignin interactions

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