A comprehensive mechanistic kinetic model for dilute acid hydrolysis of switchgrass cellulose to glucose, 5-HMF and levulinic acid

Lü, Yan; Greenwood, Ava A.; Hossain, Altaf; Yang, Bin

doi:10.1039/c4ra01631a

Cited by 83 publications

(54 citation statements)

References 53 publications

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“…4b) was increasingly compromised at higher pretreatment temperatures, the glucan appeared to be more stable than expected, especially when comparing with acidic aqueous pretreatments. For example, Yan et al reported that at 180°C, the cellulose recovery from switchgrass (a feedstock that is similar to Miscanthus) was only 12.1% after 60 min of dilute sulfuric acid pre-treatment (equivalent to a C r /C o of 0.12), 51 while 41.4% of the cellulose (C r /C o = 0.41) could be recovered after ionoSolv pretreatment under the same conditions. As we have noted above, in our experimental set-up the reaction temperature is only reached after 30 min inside the oven.…”

Section: Effect Of Intensified [Tea][hso 4 ] Pretreatment On Fractionmentioning

confidence: 99%

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

et al. 2018

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Deconstruction with low-cost ionic liquids (ionoSolv) is a promising method to pre-condition lignocellulosic biomass for the production of renewable fuels, materials and chemicals. This study investigated process intensification strategies for ionoSolv pretreatment of Miscanthus × giganteus with the low-cost ionic liquid triethylammonium hydrogen sulfate ([TEA] [HSO 4 ]) in the presence of 20 wt% water, using high temperatures and a high solid to solvent loading of 1 : 5 g/g. The temperatures investigated were 150, 160, 170 and 180°C. We discuss the effect of pretreatment temperature on lignin and hemicellulose removal, cellulose degradation and enzymatic saccharification yields. We report that very good fractionation can be achieved across all investigated temperatures, including an enzymatic saccharification yield exceeding 75% of the theoretical maximum after only 15 min of treatment at 180°C. We further characterised the recovered lignins, which established some tunability of the hydroxyl group content, subunit composition, connectivity and molecular weight distribution in the isolated lignin while maintaining maximum saccharification yield. This drastic reduction of pretreatment time at increased biomass loading without a yield penalty is promising for the development of a commercial ionoSolv pretreatment process.

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Section: Effect Of Intensified [Tea][hso 4 ] Pretreatment On Fractionmentioning

confidence: 99%

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

et al. 2018

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“…Direct comparison between the conversion of extracts and the conversion of glucose also remains difficult due to the differences in optimum reaction conditions. However, when comparing the conversion using 21 The best yield produced from comfrey is modest (6.04%), but it is also the first confirmed amount of HMF produced from this feedstock ( The yields obtained from treated biomass, even if they are low, are important as they support the idea that biomass extracts are more suitable for HMF production. It is therefore possible that the yields of HMF obtained from biomass currently reported in the literature could be increased using pre-treatments.…”

Section: Hmf Production From Methanol Treated Plant Biomassmentioning

confidence: 98%

“…Common comfrey has never been explored in the literature as a feedstock for HMF production, while switchgrass has previously been studied for HMF production. 21,22 The comparison of the two plants will indicate the suitability of comfrey for biofuel production. The dilute acid pre-treatment and the MeOH extraction were studied to produce plant extracts rich in sugars which were used for HMF production.…”

Section: Mots-clésmentioning

confidence: 99%

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Conversion of Symphytum officinale and Panicum virgatum plant extracts to 5-hydroxymethylfurfural catalysed by metal chlorides in ionic liquids

et al. 2018

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The present work examined the potential for two plants grown on Canadian soil, Symphytum officinale L. (common comfrey) and Panicum virgatum L. (switchgrass) to produce 5-hydroxymethylfurfural using metal chloride catalysis in two ionic liquids, 1-butyl-3-methylimidazolium chloride or 1-ethyl-3-methylimidazolium chloride. Furthermore, two pretreatments, namely the dilute sulfuric acid treatment and the methanol extraction, were studied as a way to improve sugar availability and increase 5-hydroxymethylfurfural yields compared to untreated biomass. The 0.5 M H 2 SO 4 hydrolysis under autoclave conditions produced sugar rich extracts containing 230±23 mg of sugars per g of hydrolysed biomass for comfrey and 425±13 mg of sugars per g of hydrolysed biomass for switchgrass. The methanol extraction produced extracts high in simple sugars with concentration of 300±60 mg of sugars per g of dry extract for comfrey and 202±16 mg of sugars per g of dry extract for switchgrass. The yield of 5-hydroxymethylfurfural was improved from less than 1% using untreated biomass to 6.04% and 18.0% using dry methanol extracts of comfrey and switchgrass, respectively. These yields, although small, are important as they show for the first time that a methanol extract could enhance the metal chloride catalysis in ionic liquids for 5-hydroxymethylfurfural production from biomass. Le rendement en 5-hydroxyméthylfurfural a été amélioré de moins de 1% en utilisant la biomasse non traitée à 6.04% et 18.0% en utilisant des extraits méthanoliques secs de consoude et panic érigé, respectivement. Ces rendements, bien que petits, sont importants car ils montrent pour la première fois qu'un extrait méthanolique peut améliorer la catalyse aux chlorures de métaux dans des liquides ioniques pour la production de 5-hydroxyméthylfurfural à partir de biomasse. Mots-Clés5-hydroxyméthyfurfural, catalyse, consoude, pré-traitement, panic érigé Pre-treatments of the plant materials are often used prior to the production of biofuels with the goals of removing hemicellulose and lignin, reducing cellulose crystallinity, and increasing cellulose porosity. 27 The main goal of the pre-treatment is therefore to improve sugar availability. 27 Very few studies have reported the use of a pre-treatment in combination with the production of HMF from plant biomass. 2,9,13,23,24 120°C for 2 h. 13 In comparison, the yield obtained from untreated wood chips was 41%. 13 In the same study, a yield of 76% of HMF was also obtained from diluted NaOH pre-treated rice straw. 13 These studies show that both the extract and the recovered biomass after treatment may be useful in increasing HMF yields from lignocellulosic biomass. However, few treatments and feedstocks have been covered in the literature, and the comparison between untreated and treated feedstocks for the production of HMF is still lacking.In the present study, we aimed to solve the issues related to using edible crops (such as soil erosion, depletion of food resources, and use of pesticides and herbicide) by ...

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“…Generally speaking, the content of the slow-reaction cellulose is mainly dependent on the source of cellulose and the temperature [25]. Recent studies also shows that the crystallinity, which usually directly relates to the contents of the slow-reaction and fast-reaction cellulose, positively depends on the temperature [26], which is also accords well with our previous studies about the process of biomass degradation [21][22][23]. Therefore, the same correlation of cellulose crystallinity and temperature is adopted to describe the ratio of the slow-reaction ˚, and the interrelation between the crystallinity and the reaction temperature T can be expressed in Eq.…”

Section: Kinetic Model In Batch Reactormentioning

confidence: 98%

Kinetic analysis and process modeling for cellulose valorization in cooperative ionic liquid pairs

et al. 2016

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A comprehensive mechanistic kinetic model for dilute acid hydrolysis of switchgrass cellulose to glucose, 5-HMF and levulinic acid

Cited by 83 publications

References 53 publications

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

Rapid pretreatment of Miscanthus using the low-cost ionic liquid triethylammonium hydrogen sulfate at elevated temperatures

Conversion of Symphytum officinale and Panicum virgatum plant extracts to 5-hydroxymethylfurfural catalysed by metal chlorides in ionic liquids

Kinetic analysis and process modeling for cellulose valorization in cooperative ionic liquid pairs

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