Dissolution of kraft lignin in alkaline solutions

被引：85

作者：

Melro, Elodie ^{[1
]}

Filipe, Alexandra ^{[2
]}

Sousa, Dora ^{[3
]}

Valente, Artur J. M. ^{[1
]}

Romano, Anabela ^{[3
]}

Antunes, Filipe E. ^{[1
]}

Medronho, Bruno ^{[3
,4
]}

机构：

[1] Univ Coimbra, Dept Chem, CQC, Rua Larga, P-3004535 Coimbra, Portugal

[2] Univ Coimbra, Dept Chem Engn, CIEPQPF, Polo 2 R Silvio Lima, P-3030790 Coimbra, Portugal

[3] Univ Algarve, Fac Sci & Technol, MED Mediterranean Inst Agr Environm & Dev, Campus Gambelas,Ed 8, P-8005139 Faro, Portugal

[4] Mid Sweden Univ, FSCN, Surface & Colloid Engn, SE-85170 Sundsvall, Sweden

来源：

INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES | 2020年 / 148卷

关键词：

Alkaline solvents; Dissolution; Kraft lignin; CELLULOSE; FEATURES;

D O I：

10.1016/j.ijbiomac.2020.01.153

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Lignins are among the most abundant renewable resources on the planet. However, their application is limited by the lack of efficient dissolution and extraction methodologies. In this work, a systematic and quantitative analysis of the dissolution efficiency of different alkaline-based aqueous systems (i.e. lithium hydroxide, LiOH; sodium hydroxide, NaOH; potassium hydroxide, KOH; cuprammonium hydroxide, CuAOH; tetrapropylammonium hydroxide, TPAOH and tetrabutylammonium hydroxide, TBAOH) is reported, for the first time, for kraft lignin. Phase maps were determined for all systems and lignin solubility was found to decrease in the following order: LiOH > NaOH > KOH > CuAOH > TPAOH > TBAOH, thus suggesting that the size of the cation plays an important role on its solubility. The pi* parameter has an opposite trend to the solubility, supporting the idea that cations of smaller size favor lignin solubility. Dissolution was observed to increase exponentially above pH 9-10 being the LiOH system the most efficient. The soluble and insoluble fractions of lignin in 0.1 M NaOH were collected and analyzed by several techniques. Overall, data suggests a greater amount of simple aromatic compounds, preferentially containing sulfur, in the soluble fraction while the insoluble fraction is very similar to the native kraft lignin. (C) 2020 Elsevier B.V. All rights reserved.

引用

页码：688 / 695

页数：8

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