Effect of Hydrothermal Processing on Hemicellulose Structure

Xiao, Ling‐Ping; Song, Guoyong; Sun, Run‐Cang

doi:10.1007/978-3-319-56457-9_3

Cited by 25 publications

(15 citation statements)

References 250 publications

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“…The reaction in MeOH that had a high E T (30) (i.e., the electronic energies used as empirical parameters of solvent polarity) value (55.4 kcal mol −1 ) resulted in a higher yield of phenolic monomers (14.3 wt %) compared to that in EtOH ( E T (30)=51.9 kcal mol −1 , 12.4 wt %) and i PrOH ( E T (30)=48.4 kcal mol −1 , 9.0 wt %). If H 2 O was used instead of MeOH, multiple phenolic monomers were obtained in 10.9 wt % yield with no observable coumarate and ferulate derivatives, probably because the generated hydronium ions influence the selectivity (Table , entry 8 and Table S7) …”

Section: Resultsmentioning

confidence: 99%

Selective Fragmentation of Biorefinery Corncob Lignin into p‐Hydroxycinnamic Esters with a Supported Zinc Molybdate Catalyst

Wang

Gao

et al. 2018

ChemSusChem

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Lignin is the largest renewable resource of bioaromatics, and the catalytic fragmentation of lignin into phenolic monomers is increasingly recognized as an important starting point for lignin valorization. Herein, we report that ZnMoO supported on MCM-41 can catalyze the fragmentation of biorefinery technical lignin, enzymatic mild acidolysis lignin, and native lignin derived from corncob to yield lignin oily products that contain 15-37.8 wt % phenolic monomers, in which the high selectivities towards methyl coumarate (1) and methyl ferulate (2) were obtained (up to 78 %). The effects of some key parameters such as the influence of the solvent, reaction temperature, time, H pressure, and catalyst dosage were examined in view of activity and selectivity. The loss of Zn from the catalyst is discussed as the primary cause of deactivation, and the catalytic activity and selectivity can be well preserved in at least six runs by thermal calcination. The high selectivity to 1 and 2 leads to their easy separation and purification from lignin oily product to provide sustainable monomers for the preparation of functional polyether esters and polyesters.

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Section: Resultsmentioning

confidence: 99%

Selective Fragmentation of Biorefinery Corncob Lignin into p‐Hydroxycinnamic Esters with a Supported Zinc Molybdate Catalyst

Wang

Gao

et al. 2018

ChemSusChem

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“…Value-added chemicals can be produced using new green-conversion routes thanks to the fractionation of lignocellulosic biomass, thus allowing the exploration of new developments into the biorefinery concept. The hydrolysis of hemicellulose produces oligosaccharides, pentose (xylose and arabinose), hexose (glucose, mannose, and galactose), acids (acetic acid, formic acid, and levulinic acid), and furans (furfural and 5-hydroxymethylfurfural), as well as insoluble humins as by-products under harsh conditions [ 79 ].…”

Section: The Effect Of Substrate Composition and Digestion Performmentioning

confidence: 99%

Anaerobic Digestion for Producing Renewable Energy—The Evolution of This Technology in a New Uncertain Scenario

Arenas

Pesantes

Carpio

et al. 2021

Entropy

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Anaerobic digestion is a well-known technology with wide application in the treatment of high-strength organic wastes. The economic feasibility of this type of installation is usually attained thanks to the availability of fiscal incentives. In this review, an analysis of the different factors associated with this biological treatment and a description of alternatives available in literature for increasing performance of the process were provided. The possible integration of this process into a biorefinery as a way for producing energy and chemical products from the conversion of wastes and biomass also analyzed. The future outlook of anaerobic digestion will be closely linked to circular economy principles. Therefore, this technology should be properly integrated into any production system where energy can be recovered from organics. Digestion can play a major role in any transformation process where by-products need further stabilization or it can be the central core of any waste treatment process, modifying the current scheme by a concatenation of several activities with the aim of increasing the efficiency of the conversion. Thus, current plants dedicated to the treatment of wastewaters, animal manures, or food wastes can become specialized centers for producing bio-energy and green chemicals. However, high installation costs, feedstock dispersion and market distortions were recognized as the main parameters negatively affecting these alternatives.

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“…This hydrothermal treatment, also known as autohydrolysis of biomass, involves the addition of water and increase of temperature. This causes a decrease of pH in the system due to the ionization of water and the release of carboxylic acids (mainly acetic acid), in combination with the effect of the high temperature and pressure applied [15,16]. This autohydrolysis leads to the disruption of the lignocellulosic biomass structure, improving the accessible surface area, and therefore enhancing the subsequent enzymatic hydrolysis [17][18][19][20] and fermentation steps [21].…”

Section: Introductionmentioning

confidence: 99%

Liquid Hot Water Pretreatment of Lignocellulosic Biomass at Lab and Pilot Scale

Jimenez-Gutierrez

Verlinden²,

Meer³

et al. 2021

Processes

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Liquid hot water pretreatment is considered to be a promising method for increasing biomass digestibility due to the moderate operational conditions without chemical additions. A necessary step towards the scalability of this pretreatment process is performing pilot plant trials. Upscaling was evaluated with a scaling factor of 500, by using 50 mL in the laboratory and 25 L in a pilot plant batch reactor. Pretreatment times were varied from 30 to 240 min, and temperatures used were 180–188 °C, while applying similar heating profiles at both scales. The initial mass fraction of poplar wood chips ranged from 10% to 16%. Liquid hot water pretreatment at laboratory and pilot scale led to analogous results. The acetic acid analysis of the liquid and solid fractions obtained after pretreatment indicated that complete deacetylation of poplar biomass can be achieved.

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Effect of Hydrothermal Processing on Hemicellulose Structure

Cited by 25 publications

References 250 publications

Selective Fragmentation of Biorefinery Corncob Lignin into p‐Hydroxycinnamic Esters with a Supported Zinc Molybdate Catalyst

Selective Fragmentation of Biorefinery Corncob Lignin into p‐Hydroxycinnamic Esters with a Supported Zinc Molybdate Catalyst

Anaerobic Digestion for Producing Renewable Energy—The Evolution of This Technology in a New Uncertain Scenario

Liquid Hot Water Pretreatment of Lignocellulosic Biomass at Lab and Pilot Scale

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