Fast track for quantitative isolation of lignosulfonates from spent sulfite liquors

Sumerskii, Ivan; Korntner, Philipp; Zinovyev, Grigory; Rosenau, Thomas; Potthast, Antje

doi:10.1039/c5ra14080c

Cited by 41 publications

(41 citation statements)

References 39 publications

(56 reference statements)

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“…The DMSO system was so far inapplicable to LS; their dissolution in DMSO is usually not possible because they are present as the corresponding salts. The LS were made soluble by transforming the salt form into the protonated variant according to a facile protocol employing a cation‐exchange resin in a solid‐phase extraction setup, as previously published . This approach allowed complete dissolution of LS in the GPC eluent.…”

Section: Resultsmentioning

confidence: 99%

“…Technical lignins of different botanic origins, obtained from four different processes (sulfite, kraft, soda, and organosolv), were analyzed. LS were isolated in our laboratory from spent sulfite liquor according to the protocol of Sumerskii et al . Briefly, LS samples were isolated by adsorption to XAD‐7 resin and subsequent desorption with ethanol.…”

Section: Methodsmentioning

confidence: 99%

“…Briefly, LS samples were isolated by adsorption to XAD‐7 resin and subsequent desorption with ethanol. The main chemical characteristics and the purity of the samples correspond to those described by Sumerskii et al . Indulin AT TM , a softwood kraft lignin, was supplied by MeadWestvaco Corp. (Glen Allen, VA, USA), whereas Sarkanda lignin (wheat and hemp) was supplied by Granit S.A. (Lausanne, Switzerland) .…”

Section: Methodsmentioning

confidence: 99%

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Fast Track to Molar‐Mass Distributions of Technical Lignins

Sulaeva

Zinovyev

Plankeele³

et al. 2017

ChemSusChem

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Technical lignins (waste products obtained from wood pulping or biorefinery processes) have so far required lengthy analysis procedures and different eluents for molar-mass analysis by gel permeation chromatography (GPC). This challenge has become more pressing recently since attempts to utilize lignins have increased, leading to skyrocketing numbers of samples to be analyzed. A new approach, which uses the eluent DMSO/LiBr (0.5 % w/v) and converts lignosulfonate salts into their acidic form before analysis, overcomes these limitations by enabling measurement of all kinds of lignins (kraft, organosolv, soda, lignosulfonates) in the same size-exclusion chromatography (SEC) system without the necessity of prior time-consuming derivatization steps. In combination with ultra-performance liquid chromatography (UPLC), analysis times are shortened to one tenth of classical lignin GPC. The new approach is presented, along with a comparison of GPC and UPLC methods and a critical discussion of the analytical parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Fast Track to Molar‐Mass Distributions of Technical Lignins

Sulaeva

Zinovyev

Plankeele³

et al. 2017

ChemSusChem

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“…Many methods have been developed to extract lignosulfonate from SSL . A recent method featuring selective adsorption of lignosulfonate with XAD‐7 exemplified many desirable features for analytical extraction . The method recovered lignosulfonate quantitatively with a simple protocol.…”

Section: Lignosulfonate Is An Integral Member Of the Product Portfolimentioning

confidence: 99%

The current and emerging sources of technical lignins and their applications

Rao

2018

Biofuels Bioprod Bioref

158

142

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Technical lignins are bulk feedstocks. They are generated as byproducts from pulping or cellulosic ethanol production. Since lignin undergoes significant structural changes in the chemical and physical treatments, all technical lignins are unique in terms of chemical structure, molecular weight, polydispersity, and impurity profile. Kraft lignin is potentially the largest source of technical lignin as new isolation technologies have been implemented on industrial scale in recent years. Lignosulfonate has been an integral product in sulfite pulping biorefinery. It has a well-established market in construction industry. Organosolv-like lignin production is increasing as cellulosic ethanol has been promoted as the substitute of fossil fuel. It may have unique applications because it has low molecule weight and is free from sulfur. Technical lignin application is expected to expand as the characteristics are improved with fractionation or chemical modification. The application of technical lignin has been focusing on developing products equivalent to those made by petroleum chemicals. The recent development in technical lignin supply should increase its market share as additives in polyurethanes and as the substitute of phenol-formaldehyde adhesives. Quality improvement of technical lignin may also encourage the study of lignin as an alternative feedstock for carbon fiber. In addition, technical lignin depolymerization has been extensively explored to provide renewable aromatic chemicals. Starting from controlled pyrolysis and thermal liquefaction as the baseline technologies, many different chemical depolymerization have been invented with a wide range of underlying chemical principles.

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“…Lignin samples were puried in accordance with procedures described in the literature. 27,36 Prior to all analyses, lignin samples were freeze-dried followed by vacuum oven drying at 40 C until complete dryness.…”

Section: Materials and Chemicalsmentioning

confidence: 99%

A fast track for the accurate determination of methoxyl and ethoxyl groups in lignin

et al. 2017

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A method based on headspace-isotope dilution (HS-ID) GC-MS for the quantitative analysis of methoxyl and ethoxyl groups in any kind of lignin has been developed. The method involves the application of an isotopically labeled internal standard (4-(methoxy-d 3 )-benzoic acid and 4-(ethoxy-d 5 )-benzoic acid), which, together with lignin, undergoes standard hydroiodic acid cleavage of methoxyl and ethoxyl groups, followed by headspace GC-MS analysis of the respective deuterated and non-deuterated iodomethanes and iodoethanes. As also the internal standard is generated in situ during ether cleavage, any variations in the procedure are levelled out. The application of the isotopically labeled internal standard essentially increased the robustness of the overall approach. The accuracy and precision of methoxyl and ethoxyl group quantification in lignins have been assessed, and the data were compared to the classical Zeisel-Vieböck-Schwappach method for methoxyl groups in lignins. The novel approach for methoxyl and ethoxyl group determination showed a more satisfactory precision, accuracy, and also a much higher sample throughput, with approximately 40 samples per day.

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Fast track for quantitative isolation of lignosulfonates from spent sulfite liquors

Abstract: In this study, a novel approach for isolation and purification of lignosulfonates from spent sulfite liquor was established.

Cited by 41 publications

References 39 publications

Fast Track to Molar‐Mass Distributions of Technical Lignins

Fast Track to Molar‐Mass Distributions of Technical Lignins

The current and emerging sources of technical lignins and their applications

A fast track for the accurate determination of methoxyl and ethoxyl groups in lignin

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