Kinetic Modelling of Hydrothermal Lignin Depolymerisation

Forchheim, D.; Hornung, Ursel; Kruse, Andrea; Sutter, Tatjana

doi:10.1007/s12649-014-9307-6

Cited by 50 publications

(48 citation statements)

References 31 publications

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“…This agrees with the recent work of Forchheim et al [25] who studied the kinetic modelling of hydrothermal lignin depolymerization. They found that, the yields of catechols increased with increasing temperature and residence time.…”

Section: Detailed Analysis Of the Oil Productssupporting

confidence: 93%

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

2014

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Section: Detailed Analysis Of the Oil Productssupporting

confidence: 93%

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

2014

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“…Likewise said, in other studies the phenol yield was found to stagnate at a certain level and for the investigated Kraft lignin the phenol amount was found to be limited to a maximum yield below 10 wt% [6] [15].…”

Section: Lignin Degradationsupporting

confidence: 51%

“…However, a process for the technical production of phenol is still not established until now, because the phenol yield stagnates at a certain point and so just the production of phenol is not profitable [6].…”

Section: Hydrothermal Treatmentmentioning

confidence: 99%

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Hydrothermal Liquefaction of Lignin

Schuler¹,

Hornung²,

Kruse³

et al. 2017

JBNB

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The majority of platform chemicals are currently provided through crude oil processes. Nevertheless, the substitution of the crude oil with biomass should be the ecological aim. Lignin, an aromatic macromolecule, may play an important role in that exchange, as it is the only bio based source of aromatic compounds. For instance, it could be a source of bifunctional aromatic molecules, like the monocyclic compounds catechol or guaiacol, or bifunctional oligomers. However, no process for the production of aromatics from lignin in technical scale has been established until now. Hence, the focus of this work is to clarify the chemical degradation mechanism under hydrothermal conditions, to liquefy lignin delivering high functional molecules and to increase the yield and selectivity of the cleavage towards bifunctional molecules like catechol. The combination of fast hydrolysis, thermal degradation reactions and hydrogenation drives the hydrothermal liquefaction; this gives the possibility to narrow down the product spectrum in comparison to other "dry" cleavage methods, towards a higher yield of e.g. catechols.

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“…A chemical reaction model only describes the experimental data correctly if all the relevant reaction pathways are contained in the model [33,34]. However, a formal kinetic reaction model does not show insights into the elemental reactions involved.…”

Section: Reaction Modelmentioning

confidence: 99%

Sucrose Is a Promising Feedstock for the Synthesis of the Platform Chemical Hydroxymethylfurfural

et al. 2018

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Hydroxymethylfurfural (HMF) has an outstanding position among bio-based platform chemicals, because high-value polymer precursors and fuel additives can be derived from HMF. Unfortunately, the large-scale industrial production of HMF is not yet realized. An open research question is the choice of hexose feedstock material. In this study, we used the highly available disaccharide sucrose for HMF synthesis. The conversion of sucrose was catalyzed by sulfuric acid in water media. Experiments were conducted at temperatures of 180, 200, and 220 • C with reaction times of 2-24 min. A carbon balance showed that the yield of unwanted side products rose strongly with temperature. We also developed a kinetic model for the conversion of sucrose, involving nine first-order reactions, to uncover the kinetics of the main reaction pathways. Within this model, HMF is produced exclusively via the dehydration of fructose. Glucose isomerizes slowly to fructose. Side products arise simultaneously from glucose, fructose, and HMF. A pathway from hexoses to xylose via reverse aldol reaction was also included in the model. We believe that sucrose is the ideal feedstock for large-scale production of HMF because it is more abundant than fructose, and easier to process than sugars obtained from lignocellulosic biomass.

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Kinetic Modelling of Hydrothermal Lignin Depolymerisation

Cited by 50 publications

References 31 publications

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

Hydrothermal Liquefaction of Lignin

Sucrose Is a Promising Feedstock for the Synthesis of the Platform Chemical Hydroxymethylfurfural

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