Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor

Ryan J. Stoklosa, Julian Velez, Shantanu Kelkar, Christopher M. Saffron, Mark C. Thies, David B. Hodge

    Research output: Contribution to journalArticle

    • 22 Citations

    Abstract

    In this work, a set of softwood lignins were recovered from a Kraft black liquor using a novel pH-based fractionation process involving sequential CO 2 acidification and separation of the solvated aqueous lignin fraction. These recovered lignin fractions were characterized with respect to properties that may be responsible for their phase partitioning behavior as well as properties that may render the lignins more suitable for materials applications. Lignin fractions were recovered between a pH range of 12.8 and 9.5 with the bulk of the lignin (90%) recovered between a pH of 11.1 and 10.0. While all the fractions were found to consist primarily of lignin as validated by sample methoxyl content, the first fractions to phase separated were found to be especially enriched in aliphatic extractives and polysaccharides. From the bulk of the lignin that was recovered between a pH of 11.1 and 10.0 a number of noteworthy trends were discernible from the data. Specifically, the phenolic hydroxyl content was found to exhibit a strong negative correlation to the fractionation pH and exhibited a nearly 50% increase with recovery at decreasing pH, while the GPC-estimated molecular weights and 13C NMR-estimated β-O-4 content showed strong positive correlations to the pH at recovery. The aliphatic hydroxyl content exhibited minimal differences between recovery conditions. Overall, these results suggest that this fractionation approach can generate lignin fractions enriched in select physical or structural properties that may be important for their application as feedstocks for renewable chemicals or materials.

    Original languageEnglish (US)
    Pages (from-to)2904-2912
    Number of pages9
    JournalGreen Chemistry
    Volume15
    Issue number10
    DOIs
    StatePublished - 2013

    Profile

    Lignin
    lignin
    Fractionation
    fractionation
    Recovery
    Muscle Contraction
    Softwoods
    Phase behavior
    Traffic Accidents
    Jaundice
    partitioning
    Acidification
    Polysaccharides
    Feedstocks
    Structural properties
    Physical properties
    Molecular weight
    Nuclear magnetic resonance
    Fluorinated Steroids
    Conjunctival Diseases

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Pollution

    Cite this

    Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor. / Stoklosa, Ryan J.; Velez, Julian; Kelkar, Shantanu; Saffron, Christopher M.; Thies, Mark C.; Hodge, David B.

    In: Green Chemistry, Vol. 15, No. 10, 2013, p. 2904-2912.

    Research output: Contribution to journalArticle

    Stoklosa, Ryan J.; Velez, Julian; Kelkar, Shantanu; Saffron, Christopher M.; Thies, Mark C.; Hodge, David B. / Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor.

    In: Green Chemistry, Vol. 15, No. 10, 2013, p. 2904-2912.

    Research output: Contribution to journalArticle

    @article{a435dcc55e144c77b7195ac634383ecb,
    title = "Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor",
    abstract = "In this work, a set of softwood lignins were recovered from a Kraft black liquor using a novel pH-based fractionation process involving sequential CO 2 acidification and separation of the solvated aqueous lignin fraction. These recovered lignin fractions were characterized with respect to properties that may be responsible for their phase partitioning behavior as well as properties that may render the lignins more suitable for materials applications. Lignin fractions were recovered between a pH range of 12.8 and 9.5 with the bulk of the lignin (90%) recovered between a pH of 11.1 and 10.0. While all the fractions were found to consist primarily of lignin as validated by sample methoxyl content, the first fractions to phase separated were found to be especially enriched in aliphatic extractives and polysaccharides. From the bulk of the lignin that was recovered between a pH of 11.1 and 10.0 a number of noteworthy trends were discernible from the data. Specifically, the phenolic hydroxyl content was found to exhibit a strong negative correlation to the fractionation pH and exhibited a nearly 50% increase with recovery at decreasing pH, while the GPC-estimated molecular weights and 13C NMR-estimated β-O-4 content showed strong positive correlations to the pH at recovery. The aliphatic hydroxyl content exhibited minimal differences between recovery conditions. Overall, these results suggest that this fractionation approach can generate lignin fractions enriched in select physical or structural properties that may be important for their application as feedstocks for renewable chemicals or materials.",
    author = "Stoklosa, {Ryan J.} and Julian Velez and Shantanu Kelkar and Saffron, {Christopher M.} and Thies, {Mark C.} and Hodge, {David B.}",
    year = "2013",
    doi = "10.1039/c3gc41182f",
    volume = "15",
    pages = "2904--2912",
    journal = "Green Chemistry",
    issn = "1463-9262",
    publisher = "Royal Society of Chemistry",
    number = "10",

    }

    TY - JOUR

    T1 - Correlating lignin structural features to phase partitioning behavior in a novel aqueous fractionation of softwood Kraft black liquor

    AU - Stoklosa,Ryan J.

    AU - Velez,Julian

    AU - Kelkar,Shantanu

    AU - Saffron,Christopher M.

    AU - Thies,Mark C.

    AU - Hodge,David B.

    PY - 2013

    Y1 - 2013

    N2 - In this work, a set of softwood lignins were recovered from a Kraft black liquor using a novel pH-based fractionation process involving sequential CO 2 acidification and separation of the solvated aqueous lignin fraction. These recovered lignin fractions were characterized with respect to properties that may be responsible for their phase partitioning behavior as well as properties that may render the lignins more suitable for materials applications. Lignin fractions were recovered between a pH range of 12.8 and 9.5 with the bulk of the lignin (90%) recovered between a pH of 11.1 and 10.0. While all the fractions were found to consist primarily of lignin as validated by sample methoxyl content, the first fractions to phase separated were found to be especially enriched in aliphatic extractives and polysaccharides. From the bulk of the lignin that was recovered between a pH of 11.1 and 10.0 a number of noteworthy trends were discernible from the data. Specifically, the phenolic hydroxyl content was found to exhibit a strong negative correlation to the fractionation pH and exhibited a nearly 50% increase with recovery at decreasing pH, while the GPC-estimated molecular weights and 13C NMR-estimated β-O-4 content showed strong positive correlations to the pH at recovery. The aliphatic hydroxyl content exhibited minimal differences between recovery conditions. Overall, these results suggest that this fractionation approach can generate lignin fractions enriched in select physical or structural properties that may be important for their application as feedstocks for renewable chemicals or materials.

    AB - In this work, a set of softwood lignins were recovered from a Kraft black liquor using a novel pH-based fractionation process involving sequential CO 2 acidification and separation of the solvated aqueous lignin fraction. These recovered lignin fractions were characterized with respect to properties that may be responsible for their phase partitioning behavior as well as properties that may render the lignins more suitable for materials applications. Lignin fractions were recovered between a pH range of 12.8 and 9.5 with the bulk of the lignin (90%) recovered between a pH of 11.1 and 10.0. While all the fractions were found to consist primarily of lignin as validated by sample methoxyl content, the first fractions to phase separated were found to be especially enriched in aliphatic extractives and polysaccharides. From the bulk of the lignin that was recovered between a pH of 11.1 and 10.0 a number of noteworthy trends were discernible from the data. Specifically, the phenolic hydroxyl content was found to exhibit a strong negative correlation to the fractionation pH and exhibited a nearly 50% increase with recovery at decreasing pH, while the GPC-estimated molecular weights and 13C NMR-estimated β-O-4 content showed strong positive correlations to the pH at recovery. The aliphatic hydroxyl content exhibited minimal differences between recovery conditions. Overall, these results suggest that this fractionation approach can generate lignin fractions enriched in select physical or structural properties that may be important for their application as feedstocks for renewable chemicals or materials.

    UR - http://www.scopus.com/inward/record.url?scp=84884635730&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84884635730&partnerID=8YFLogxK

    U2 - 10.1039/c3gc41182f

    DO - 10.1039/c3gc41182f

    M3 - Article

    VL - 15

    SP - 2904

    EP - 2912

    JO - Green Chemistry

    T2 - Green Chemistry

    JF - Green Chemistry

    SN - 1463-9262

    IS - 10

    ER -