Analytical Pyrolysis Characteristics of Enzymatic/Mild Acidolysis Lignin (EMAL)

Li, Tengfei; Lyu, Gaojin; Saeed, Haroon A. M.; Liu, Yu; Wu, Yinglong; Yang, Guihua; Lucia, Lucian A.

doi:10.15376/biores.13.2.4484-4496

Cited by 14 publications

(13 citation statements)

References 38 publications

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“…Li et al compared the pyrolysis of wood and herbaceous EMAL and found that a high phenolics yield can be obtained at mild pyrolysis temperatures of 450 to 650°C. [85] The enzyme was also used in further fractionation of the lignin. For example, two common lignins (alkaline lignin: AL, and hydrolysis lignin: HL) were treated with laccase, and the results show that the structure, especially the Ph-OH contents and molecular weight of lignin, could be effectively controlled, which is beneficial for antioxidation applications.…”

Section: Enzyme-assisted Fractionationmentioning

confidence: 99%

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Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

et al. 2020

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Lignin, as the most abundant aromatic biopolymer in nature, has attracted great attention due to the complexity and richness of its functional groups for value‐added applications. The yield of production of lignin and the reactivity of prepared lignin are very important to guarantee the study and development of lignin‐based chemicals and materials. Various fractionation techniques have been developed to obtain high yield and relatively high‐purity lignin as well as carbohydrates (hemicelluloses and celluloses) and to reduce the condensed and degraded nature of conventional biorefinery lignin. Herein, novel and efficient biomass fractionation and lignin fractionation towards lignin valorization are summarized and discussed.

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Section: Enzyme-assisted Fractionationmentioning

confidence: 99%

“…This strategy is usually used in laboratory research. Li et al compared the pyrolysis of wood and herbaceous EMAL and found that a high phenolics yield can be obtained at mild pyrolysis temperatures of 450 to 650 °C . The enzyme was also used in further fractionation of the lignin.…”

Section: Fractionation From Lignocellulosic Biomassmentioning

confidence: 99%

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

et al. 2020

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“…During pyrolysis, G-type phenols can be gradually transformed into H-type ones due to the enhanced cleavage of methyl aryl ether bond caused by DES treatment. On the other hand, a small amount of mono aromatic hydrocarbons (MAHs) can also be observed, formed via secondary reactions, such as dehydroxylation and demethoxylation at high temperatures [ 234 ]. In addition, compared to untreated lignin, DES-treated samples can produce more MAHs due to their improved hydrogen to carbon efficient ratio (i.e., H/C eff ) [ 235 ].…”

Section: Lignin Pyrolysismentioning

confidence: 99%

A review on lignin pyrolysis: pyrolytic behavior, mechanism, and relevant upgrading for improving process efficiency

2022

Biotechnol Biofuels

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Lignin is a promising alternative to traditional fossil resources for producing biofuels due to its aromaticity and renewability. Pyrolysis is an efficient technology to convert lignin to valuable chemicals, which is beneficial for improving lignin valorization. In this review, pyrolytic behaviors of various lignin were included, as well as the pyrolytic mechanism consisting of initial, primary, and charring stages were also introduced. Several parallel reactions, such as demethoxylation, demethylation, decarboxylation, and decarbonylation of lignin side chains to form light gases, major lignin structure decomposition to generate phenolic compounds, and polymerization of active lignin intermediates to yield char, can be observed through the whole pyrolysis process. Several parameters, such as pyrolytic temperature, time, lignin type, and functional groups (hydroxyl, methoxy), were also investigated to figure out their effects on lignin pyrolysis. On the other hand, zeolite-driven lignin catalytic pyrolysis and lignin co-pyrolysis with other hydrogen-rich co-feedings were also introduced for improving process efficiency to produce more aromatic hydrocarbons (AHs). During the pyrolysis process, phenolic compounds and/or AHs can be produced, showing promising applications in biochemical intermediates and biofuel additives. Finally, some challenges and future perspectives for lignin pyrolysis have been discussed.

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“…Over one million tons of lignin are produced per year as a byproduct of the paper and pulp industry, and this value is poised to increase from the emerging biomass refinery industry (Glasser et al 1999). Only approximately 2% of the lignin available from the pulp and paper industry is used commercially, with the remainder being burned as a low-value fuel (Lou et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Depolymerization characteristics during the pyrolysis of two industrial lignins

Chu

Jiang

2017

BioRes

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For the value-added utilization of industrial lignin both from pulping black liquor and acid hydrolysis residues, the eucalyptus alkali lignin (AL) and enzymatic mild acidolysis corncob-to-xylitol residue lignin (EMARL) were isolated. Their pyrolysis behaviors were investigated by thermogravimetric analysis (TGA), in situ Fourier transform infrared spectroscopy (FTIR), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The chemical bonds of EMARL were easier to break than AL at relatively lower temperatures, which was confirmed by the relationship between temperature and the differential absorbance of functional groups (such as carbonyl and hydroxyl). Based on the analysis of pyrolysis products, the value-added monomers were the main products. At 400 °C, AL mainly contained guaiacyl-type and syringyl-type compounds and the yields were 28.95% and 62.54%, respectively, while EMARL contained more guaiacyl-type products (62.96%). When the temperature was increased to 600 °C, the contents of phenol-type increased, suggesting that the demethoxylation reaction occurred during lignin pyrolysis. Study of the characteristics of pyrolysis could be significant for understanding the thermochemical depolymerization of AL and EMARL for value-added products.

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Analytical Pyrolysis Characteristics of Enzymatic/Mild Acidolysis Lignin (EMAL)

Cited by 14 publications

References 38 publications

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

Biomass Fractionation and Lignin Fractionation towards Lignin Valorization

A review on lignin pyrolysis: pyrolytic behavior, mechanism, and relevant upgrading for improving process efficiency

Depolymerization characteristics during the pyrolysis of two industrial lignins

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