Flow-through strategy to fractionate lignin from eucalyptus with formic acid/hydrochloric solution under mild conditions.
Int J Biol Macromol
; 204: 364-372, 2022 Apr 15.
Article
in En
| MEDLINE
| ID: mdl-35149095
ABSTRACT
Formic acid is an attractive solvent for the fractionation of lignocellulose for the production of biomaterials and chemicals, while the operation conducted in a batch manner is not conducive to mass transfer in separation process. In this research, eucalyptus was fractionated with formic acid/hydrochloric solution in a flow-through reactor at 95 °C, and the structural characteristics and the composition of fractionated lignin in different stages were investigated. Results showed that the fractionation efficiency was notably improved with a flow-through reactor, as evidenced by the low solid residue yield of 49.5% and the lignin removal rate of 79.4% as compared to the batch manner. During the fractionation process, the dissolution rate of lignin decreased gradually, and the obtained lignin samples showed low molecular weight (<3000), good uniformity (<2), and high thermal stability. The structure analysis showed that ß-O-4, ß-ß, and ß-5 linkages in lignin were degraded to varying degrees with increased time, and the degradation of G units was more severe than S ones.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Eucalyptus
/
Lignin
Language:
En
Journal:
Int J Biol Macromol
Year:
2022
Document type:
Article
Affiliation country: