Delignification of unbleached pulp by ternary deep eutectic solvents

The processing of lignocellulosic materials is very limited because of their low solubility in water and some organic solvents. Fifteen ternary deep eutectic solvents (DESs) were prepared and tested as solvents suitable for delignification of unbleached pulp. The selected ternary DESs are composed o...

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Autores principales:	Majová Veronika, Jablonský Michal, Lelovský Marek
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	deep eutectic solvents fibres delignification lignin pulp Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/5dd6356a32124e28be2dc21a6957f8d0
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spelling	oai:doaj.org-article:5dd6356a32124e28be2dc21a6957f8d02021-12-05T14:10:50ZDelignification of unbleached pulp by ternary deep eutectic solvents2191-955010.1515/gps-2021-0066https://doaj.org/article/5dd6356a32124e28be2dc21a6957f8d02021-10-01T00:00:00Zhttps://doi.org/10.1515/gps-2021-0066https://doaj.org/toc/2191-9550The processing of lignocellulosic materials is very limited because of their low solubility in water and some organic solvents. Fifteen ternary deep eutectic solvents (DESs) were prepared and tested as solvents suitable for delignification of unbleached pulp. The selected ternary DESs are composed of quaternary ammonium salts and amino acids as hydrogen-bond acceptors, and organic acids and polyvalent alcohols as hydrogen bond donors, with molar ratios varying for the individual components. The delignification efficiency is significantly influenced by the degree of penetration of the solvent into the pulp fibre structure. Therefore, the density and viscosity analysis of individual solvents was performed. Unbleached beech pulp with initial kappa number 13.9 was treated with the prepared DESs. The kappa number indicates the residual lignin content or the bleachability of pulp. The efficiency of the solvents ranged from 1.4% to 28.1%. The most suitable for the pretreatment of fibres, based on lignin removal efficiency, were found to be three DESs, in the following order: malonic acid/choline chloride/1,3-propanediol (1:1:3) > choline chloride/acetamide/lactic acid (1:2:3) > choline chloride/urea/lactic acid (1:2:3).Majová VeronikaJablonský MichalLelovský MarekDe Gruyterarticledeep eutectic solventsfibresdelignificationligninpulpChemistryQD1-999ENGreen Processing and Synthesis, Vol 10, Iss 1, Pp 666-676 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	deep eutectic solvents fibres delignification lignin pulp Chemistry QD1-999
spellingShingle	deep eutectic solvents fibres delignification lignin pulp Chemistry QD1-999 Majová Veronika Jablonský Michal Lelovský Marek Delignification of unbleached pulp by ternary deep eutectic solvents
description	The processing of lignocellulosic materials is very limited because of their low solubility in water and some organic solvents. Fifteen ternary deep eutectic solvents (DESs) were prepared and tested as solvents suitable for delignification of unbleached pulp. The selected ternary DESs are composed of quaternary ammonium salts and amino acids as hydrogen-bond acceptors, and organic acids and polyvalent alcohols as hydrogen bond donors, with molar ratios varying for the individual components. The delignification efficiency is significantly influenced by the degree of penetration of the solvent into the pulp fibre structure. Therefore, the density and viscosity analysis of individual solvents was performed. Unbleached beech pulp with initial kappa number 13.9 was treated with the prepared DESs. The kappa number indicates the residual lignin content or the bleachability of pulp. The efficiency of the solvents ranged from 1.4% to 28.1%. The most suitable for the pretreatment of fibres, based on lignin removal efficiency, were found to be three DESs, in the following order: malonic acid/choline chloride/1,3-propanediol (1:1:3) > choline chloride/acetamide/lactic acid (1:2:3) > choline chloride/urea/lactic acid (1:2:3).
format	article
author	Majová Veronika Jablonský Michal Lelovský Marek
author_facet	Majová Veronika Jablonský Michal Lelovský Marek
author_sort	Majová Veronika
title	Delignification of unbleached pulp by ternary deep eutectic solvents
title_short	Delignification of unbleached pulp by ternary deep eutectic solvents
title_full	Delignification of unbleached pulp by ternary deep eutectic solvents
title_fullStr	Delignification of unbleached pulp by ternary deep eutectic solvents
title_full_unstemmed	Delignification of unbleached pulp by ternary deep eutectic solvents
title_sort	delignification of unbleached pulp by ternary deep eutectic solvents
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/5dd6356a32124e28be2dc21a6957f8d0
work_keys_str_mv	AT majovaveronika delignificationofunbleachedpulpbyternarydeepeutecticsolvents AT jablonskymichal delignificationofunbleachedpulpbyternarydeepeutecticsolvents AT lelovskymarek delignificationofunbleachedpulpbyternarydeepeutecticsolvents
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Delignification of unbleached pulp by ternary deep eutectic solvents

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