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Efficient and eco-friendly isolation and purification of lignin from black liquor with choline chloride-based deep eutectic solvents

Authors :
Zhuang Liu
Yi Hou
Chao Liu
Songqing Hu
Source :
Nordic Pulp & Paper Research Journal.
Publication Year :
2023
Publisher :
Walter de Gruyter GmbH, 2023.

Abstract

This study developed an efficient and green method for isolating and purifying lignin from black liquor (BL) using deep eutectic solvents (DESs). After the short and mild process (700 W microwave-assisted, 100 °C, DES: BL 1:5 (v: v), 30 min) using optimized DES (lactic acid (LA): choline chloride (ChCl) 10:1, molar ratio), the yield and purity of lignin obtained from 100 mL BL was 1.58 g and 88.12%, respectively, which was more efficient than the results of 1.18 g and 78.54% of the conventional process. Furthermore, more than 95% of initial results were obtained after three cycles. The composition and structure of DESs and conventionally purified lignin were slightly different. The solvent costs for both processes were also evaluated, showing that the DES process has great potential to replace traditional bulky and environmentally unfriendly procedures for lignin isolation and purification and to help develop new strategies for the potential added value of lignin.

Subjects

Subjects :
General Materials Science
Forestry

Details

ISSN :
20000669 and 02832631
Database :
OpenAIRE
Journal :
Nordic Pulp & Paper Research Journal
Accession number :
edsair.doi...........3149fdc19be2f1b3fc861633d3ccc3b2
Full Text :
https://doi.org/10.1515/npprj-2022-0093