Characterization of Klason lignin samples isolated from beech and aspen using microbore column size‐exclusion chromatography

Beňo, Erik; Góra, Robert W.; Hutta, Milan

doi:10.1002/jssc.201800361

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…Second group of processes is classified by the extension of the structural modifications induced in lignin ( Figure 4) [21]. Then, it is possible to find methods where a significant modification of lignin is produced, thus giving four types of lignin: sulfite [22], klason [23][24], alkali [25], and Kraft lignin [26][27]; and methods where mild structural modifications have been done giving lignin-type commonly named as Organosolv [28] milled wood [29], cellulolytic enzyme [30] and ionic liquid lignin [31][32], respectively. The type of manufacturing process of pulp used for papermaking determines the type of lignin industrially available, or at least the most affordable today.…”

Section: Lignin Extraction and Isolation Methodsmentioning

confidence: 99%

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

Ventura

Dómine

Chávez-Sifontes

2019

CCAT

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Valorization of lignocellulosic biomass becomes a sustainable alternative against the constant depletion and environmental problems of fossil sources necessary for the production of chemicals and fuels. In this context, a wide range of renewable raw materials can be obtained from lignocellulosic biomass in both polymeric (i.e. cellulose, starch, lignin) and monomeric (i.e. sugars, polyols, phenols) forms. Lignin and its derivatives are interesting platform chemicals for industry, although mainly due to its refractory characteristics its use has been less considered compared to other biomass fractions. To take advantage of the potentialities of lignin, it is necessary to isolate it from the cellulose/ hemicellulosic fraction, and then apply depolymerization processes; the overcoming of technical limitations being a current issue of growing interest for many research groups. In this review, significant data related to the structural characteristics of different types of commercial lignins are presented, also including extraction and isolation processes from biomass, and industrial feedstocks obtained as residues from paper industry under different treatments. The review mainly focuses on the different depolymerization processes (hydrolysis, hydrogenolysis, hydrodeoxygenation, pyrolysis) up to now developed and investigated analyzing the different hydrocarbons and aromatic derivatives obtained in each case, as well as the interesting reactions some of them may undergo. Special emphasis is done on the development of new catalysts and catalytic processes for the efficient production of fuels and chemicals from lignin. The possibilities of applications for lignin and its derivatives in new industrial processes and their integration into the biorefinery of the future are also assessed.

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Section: Lignin Extraction and Isolation Methodsmentioning

confidence: 99%

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

Ventura

Dómine

Chávez-Sifontes

2019

CCAT

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“…The average molecular weight and molecular weight distribution of lignin depolymerization products are important indices for evaluating the structure and physical properties of depolymerized lignin. Gel permeation chromatography (GPC), a widely recognized and effective method for polymer characterization , is frequently used to analyze the molecular weights and molecular weight distributions of different types of lignin . However, little research has been conducted on lignin depolymerization products due to their complexity , which in turn necessitates higher GPC resolution and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Rapid determination of lignosulfonate depolymerization products by advanced polymer chromatography

Qian

Cui

Cai

et al. 2019

J of Separation Science

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Depolymerized lignin products are very complex mixtures. Based on a depolymerization solution of commercially available sodium lignosulfonate under mild conditions, a fast and efficient method for the separation and direct characterization of the degree and efficiency of the acid-catalyzed depolymerization of lignin was developed in this study. Using an ultraviolet detector, the depolymerized lignosulfonate products were well separated and characterized according to the relative molar mass distribution on an advanced polymer chromatographic system with three ethylene-bridged hybrid columns having small pore sizes (45Å) in series and tetrahydrofuran as the mobile phase. The developed advanced polymer chromatography method enabled the detection of low-molecular-weight lignin degradation products (M n = 260-1100 Da) with high peak resolutions in less than 7.2 min. Furthermore, preliminary advanced polymer chromatography studies to determine the influence of reaction temperature on the depolymerized products indicated that the depolymerized aromatics fell in several molecular weight ranges with an extremely low dispersity. This new approach can be used for the rapid analysis of lignin depolymerization products.

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Insights on further improving fast size exclusion chromatography separations of biopharmaceuticals using 2.1 millimetre column diameters

Fekete¹,

Lauber

2023

Journal of Chromatography A

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Characterization of Klason lignin samples isolated from beech and aspen using microbore column size‐exclusion chromatography

Cited by 3 publications

References 38 publications

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

Catalytic Processes For Lignin Valorization into Fuels and Chemicals (Aromatics)

Rapid determination of lignosulfonate depolymerization products by advanced polymer chromatography

Insights on further improving fast size exclusion chromatography separations of biopharmaceuticals using 2.1 millimetre column diameters

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