Isolation and Characterization of Organosolv and Alkaline Lignins from Hardwood and Softwood Biomass

Christos Nitsos, Ryan Stoklosa, Anthi Karnaouri, Dimitrij Vörös, Heiko Lange, David Hodge, Claudia Crestini, Ulrika Rova, Paul Christakopoulos

    Research output: Research - peer-reviewArticle

    • 6 Citations

    Abstract

    Isolation of lignins from hardwood and softwood biomass samples, containing 26.1% and 28.1% lignin, respectively, has been performed with the use of alkaline and organosolv pretreatment methods. The effect of catalyst loading, ethanol content, particle size, and pretreatment time on the yields and properties of the isolated lignins were investigated. Alkaline lignins had higher carbohydrate content - up to 30% - and exhibited higher molecular weights in the range of 3000 Da, with a maximum phenolic hydroxyl content of 1 mmol g-1 for birch and 2 mmol g-1 for spruce. Organosolv lignins, on the other hand, showed high purity - 93% or higher - despite the more extensive biomass dissolution into the pretreatment medium; they also exhibited a lower range of molecular weights between 600 and 1600 Da depending on the source and pretreatment conditions. Due to the lower molecular weight, phenolic hydroxyl content was also increased, reaching as high as 4 mmol g-1 with a simultaneous decrease in aliphatic hydroxyl content as low as 0.6 mmol g-1. Efficient lignin dissolution of 62% for spruce and 69% for birch, achieved at optimal pretreatment conditions, was combined with extensive hemicellulose removal.

    LanguageEnglish (US)
    Pages5181-5193
    Number of pages13
    JournalACS Sustainable Chemistry and Engineering
    Volume4
    Issue number10
    DOIs
    StatePublished - Oct 3 2016

    Profile

    Softwoods
    Lignin
    Hardwoods
    Biomass
    lignin
    biomass
    Hydroxyl Radical
    Molecular weight
    Dissolution
    dissolution
    Ethanol
    Particle size
    Carbohydrates
    Catalysts
    hemicellulose
    carbohydrate
    ethanol
    catalyst
    particle size
    effect

    Keywords

    • Alkaline
    • Biomass
    • Fractionation
    • Lignin
    • Organosolv
    • Pretreatment

    ASJC Scopus subject areas

    • Chemistry(all)
    • Environmental Chemistry
    • Chemical Engineering(all)
    • Renewable Energy, Sustainability and the Environment

    Cite this

    Nitsos, C., Stoklosa, R., Karnaouri, A., Vörös, D., Lange, H., Hodge, D., ... Christakopoulos, P. (2016). Isolation and Characterization of Organosolv and Alkaline Lignins from Hardwood and Softwood Biomass. ACS Sustainable Chemistry and Engineering, 4(10), 5181-5193. DOI: 10.1021/acssuschemeng.6b01205

    Isolation and Characterization of Organosolv and Alkaline Lignins from Hardwood and Softwood Biomass. / Nitsos, Christos; Stoklosa, Ryan; Karnaouri, Anthi; Vörös, Dimitrij; Lange, Heiko; Hodge, David; Crestini, Claudia; Rova, Ulrika; Christakopoulos, Paul.

    In: ACS Sustainable Chemistry and Engineering, Vol. 4, No. 10, 03.10.2016, p. 5181-5193.

    Research output: Research - peer-reviewArticle

    Nitsos, C, Stoklosa, R, Karnaouri, A, Vörös, D, Lange, H, Hodge, D, Crestini, C, Rova, U & Christakopoulos, P 2016, 'Isolation and Characterization of Organosolv and Alkaline Lignins from Hardwood and Softwood Biomass' ACS Sustainable Chemistry and Engineering, vol 4, no. 10, pp. 5181-5193. DOI: 10.1021/acssuschemeng.6b01205
    Nitsos, Christos ; Stoklosa, Ryan ; Karnaouri, Anthi ; Vörös, Dimitrij ; Lange, Heiko ; Hodge, David ; Crestini, Claudia ; Rova, Ulrika ; Christakopoulos, Paul. / Isolation and Characterization of Organosolv and Alkaline Lignins from Hardwood and Softwood Biomass. In: ACS Sustainable Chemistry and Engineering. 2016 ; Vol. 4, No. 10. pp. 5181-5193
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