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Fractionation of lignin from rice straw using an acidified biphasic solvent system.
- Source :
-
International Journal of Biological Macromolecules . Mar2023, Vol. 230, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- To obtain lignin from lignocellulosic biomass, phenoxyethanol (EPH) was employed to construct a biphasic solvent system. The concentration of EPH in this biphasic solvent system was first studied to determine a pretreatment condition for fractionation of lignin. Then, the fractionation of lignin from rice straw was performed under the conditions of temperature 130 °C, cooking time 60 min and sulfuric acid concentration 0.1 M, in 70 % aqueous EPH solvent system. The results showed that 50.97 %, 49.52 % or 82.02 % of the removed lignin with the purity of 89.04 %, 91.30 % or 84.76 % was regenerated from EPH liquor using dimethyl carbonate (DMC), dimethoxymethane (DMM) or diethyl ether (DE) as precipitant, respectively. Additionally, the weight-average molecular weight (Mw) and dispersity index (Đ) of the regenerated lignin decreased to 4247–4809 g/mol and 1.26–1.60 compared with that of the original lignin (5654 g/mol and 4.78). Finally, the compositional and structural characteristics of lignin, e.g., molecular weight and molecular structure, were also investigated by DSC, HSQC and elemental analysis. [Display omitted] • Proposed an efficient biphasic process of fractionating lignin with phenoxyethanol. • > 82 % of the removed lignin could be regenerated from solvent liquor. • Purity of the regenerated lignin reached up to 91.30 %. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01418130
- Volume :
- 230
- Database :
- Academic Search Index
- Journal :
- International Journal of Biological Macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 161765860
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2023.123249