Morphology of lignin structures on fiber surfaces after organosolv pretreatment
2022 (English)In: Biopolymers, ISSN 0006-3525, E-ISSN 1097-0282, Vol. 113, no 9, article id e23520Article in journal (Refereed) Published
Abstract [en]
The redeposition of lignin to the fiber surface after organosolv pretreatment was studied using two different reactor types. Results from the conventional autoclave reactor suggest that redeposition occurs during the cooling down stage. Redeposited particles appeared to be spherical in shape. The size and population density of the particles depends on the concentration of organosolv lignin in the cooking liquor, which is consistent with the hypothesis that reprecipitation of lignin occurs when the system is cooled down. The use of a displacement reactor showed that displacing the spent cooking liquor with fresh cooking liquor helps in reducing the redeposition and the inclusion of a washing stage with fresh cooking liquor reduced the reprecipitation of lignin, particularly on the outer fiber surfaces. Redeposition of lignin was still observed on regions that were less accessible to washing liquid, such as fiber lumens, suggesting that complete prevention of redeposition was not achieved. © 2022 The Authors.
Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2022. Vol. 113, no 9, article id e23520
Keywords [en]
lignin morphology, lignin redeposition, organosolv pretreatment, SEM analysis of fiber surface, Fibers, Lignin, Particle size analysis, Population statistics, Surface morphology, Washing, Cooking liquor, Fibre surfaces, Lignin structure, Re-precipitation, Redeposition, SEM analyse of fiber surface, SEM analysis, Morphology
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
URN: urn:nbn:se:ri:diva-60033DOI: 10.1002/bip.23520Scopus ID: 2-s2.0-85132576291OAI: oai:DiVA.org:ri-60033DiVA, id: diva2:1701095
Note
Funding details: Norges Teknisk-Naturvitenskapelige Universitet, NTNU; Funding details: Norges Forskningsråd, 295864; Funding details: Department of Chemical Engineering, Universiti Teknologi Petronas; Funding text 1: This project was funded by the Department of Chemical Engineering, NTNU, Trondheim, and the Department of Chemical Engineering is acknowledged for funding the Ph.D. fellowship of Prajin Joseph, and the postdoctoral fellowship of Vegar Ottesen. The authors would like to acknowledge RISE PFI for technical assistance and providing the laboratory facilities. This work is carried out as part of the Norwegian national research infrastructure project NorBioLab (“Norwegian Biorefinery Laboratory”) and the Norwegian Centre for Sustainable Bio‐based Fuels and Energy (Bio4Fuels). We gratefully acknowledge The Research Council of Norway for the support to the Norwegian Micro‐ and Nano‐Fabrication Facility, NorFab, project number 295864.
2022-10-042022-10-042025-09-23Bibliographically approved