Hardwood and softwood kraft lignins fractionation by simple sequential acid precipitation

Lourençon, Tainise V.; Hansel, F. A.; Silva, Thiago Aparecido da; Ramos, Luiz Pereira; Muñiz, Graciela Inés Bolzón de; Magalhães, Washington Luiz Esteves

doi:10.1016/j.seppur.2015.09.015

Cited by 118 publications

(85 citation statements)

References 31 publications

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“…Carbon and hydrogen contents of both LCCs are estimated as 63–60% and 5.4–6.3%, respectively. These values are similar to carbohydrate-free bagasse and softwood kraft lignin [ 95 , 100 ].…”

Section: Lcc Propertiessupporting

confidence: 60%

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Tarasov

Leitch

Fatehi

2018

Biotechnol Biofuels

324

152

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The complexity of lignin and hemicellulose segmentation has been known since the middle of the ninetieth century. Studies confirmed that all lignin units in coniferous species and 47–66% of lignin moieties in deciduous species are bound to hemicelluloses or cellulose molecules in lignin–carbohydrate complexes (LCC). Different types and proportions of lignin and polysaccharides present in biomass lead to the formation of LCC with a great variety of compositions and structures. The nature and amount of LCC linkages and lignin substructures affect the efficiency of pulping, hydrolysis, and digestibility of biomass. This review paper discusses the structures, compositions, and properties of LCC present in biomass and in the products obtained via pretreating biomass. Methods for extracting, fractionating, and analyzing LCC of biomass, pulp, and spent pulping liquors are critically reviewed. The main perspectives and challenges associated with these technologies are extensively discussed. LCC could be extracted from biomass following varied methods, among which dimethyl sulfoxide or dioxane (Björkman’s) and acetic acid (LCC-AcOH) processes are the most widely applied. The oxidation and methylation treatments of LCC materials elucidate the locations and frequency of binding sites of hemicelluloses to lignin. The two-dimensional nuclear magnetic resonance analysis allows the identification of the structure and the quantity of lignin–carbohydrate bonds involved in LCC. LCC application seems promising in medicine due to its high anti-HIV, anti-herpes, and anti-microbial activity. In addition, LCC was successfully employed as a precursor for the preparation of spherical biocarriers.

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Section: Lcc Propertiessupporting

confidence: 60%

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Tarasov

Leitch

Fatehi

2018

Biotechnol Biofuels

324

152

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“…1a), which were attributed to the remaining minerals and carbonized lignocellulosic macromolecules. The peaks at 1420 cm −1 (CH in plane deformation with aromatic ring stretching) and 2920 cm −1 (C\ \H asymmetric stretching in methylene groups) confirmed the remaining of carbonized lignin structures [30]. Also, the peak at 580 cm −1 could be attributed to the O\ \P\ \O bending mode after the formation of silica-metal phosphates [31], or to the Ca\ \O stretching vibration in the possible formation of Si/Al/Ca complexes [32].…”

Section: Properties Of Obtained Biogenic Silica From Horsetailmentioning

confidence: 75%

Biogenic SiO2 in colloidal dispersions via ball milling and ultrasonication

2016

Self Cite

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“…Thus, ultrafiltration can be a technically interesting way of obtaining technical lignin as it is or in combination with ways of fractionating lignin based on selective acid precipitation or extraction with organic solvents (Cui et al 2014;Lourencon et al 2015;Dodd et al 2015).…”

Section: Technical Significancementioning

confidence: 99%

Lignin Prepared by Ultrafiltration of Black Liquor: Investigation of Solubility, Viscosity, and Ash Content

Giummarella¹,

Lindgren²,

Lindström³

et al. 2016

BioResources

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Technical lignin, which can be potentially obtained in large amounts as a by-product from kraft pulping, represents a potential resource for manufacturing fuels and chemicals. Upgrading of lignin, by lowering its molecular weight, is a valuable alternative to precipitation from black liquor, which occurs in the Lignoboost process. The solubility properties of Lignoboost lignin and filtered lignin in a number of technically feasible solvents were compared, and it was found that both lignins were dissolved in similar solvents. With the exception of furfural, the best lignin solvents generally were organic solvents miscible with water, such as methanol. It was possible to dissolve more filtered lignin in higher concentrations than Lignoboost lignin; additionally, the viscosities of the filtered lignin solutions were also considerably lower than those of Lignoboost lignin, especially at higher concentrations. Methods for non-organic component removal from filtrated lignin were tested, and it was concluded that several cold acidic treatments after dewatering can lower the ash content to values below 0.5% by weight.

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Hardwood and softwood kraft lignins fractionation by simple sequential acid precipitation

Cited by 118 publications

References 31 publications

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Lignin–carbohydrate complexes: properties, applications, analyses, and methods of extraction: a review

Biogenic SiO2 in colloidal dispersions via ball milling and ultrasonication

Lignin Prepared by Ultrafiltration of Black Liquor: Investigation of Solubility, Viscosity, and Ash Content

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