Increasing the lignin yield of the Alkaline Polyol Pulping process by treating black liquor with laccases of Myceliophthora thermophila

  • The Alkaline Polyol Pulping process separates cellulose from lignocellulosic biomass by dissolving lignin to a great extent. Due to the pulping conditions the dissolved lignin depolymerises and only 75% can be precipitated. To increase this amount, a 24 h reaction of laccases of Myceliophthora thermophila with lignin dissolved in black liquor of the AlkaPolP process was investigated. The influence of pH, temperature, enzyme concentration and partial oxygen pressure was examined in a batch stirred tank reactor using a Box–Behnken factorial design. Due to the enzymatic reaction the lignin polymerises which results in an enhanced lignin precipitation. The addition of a mediator improves the polymerisation but decreases the amount of precipitable lignin. The influence of the parameters on precipitation yield and molecular mass can sufficiently be described with a second-order model and optimum conditions can be assessed. FT-IR spectra of the obtained lignins revealed that its typical phenolic structure is preserved.

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Metadaten
Author: Norman Engel, Martin Hundt, Tino Schapals
URL:http://www.sciencedirect.com/science/article/pii/S0960852415016570
DOI:https://doi.org/10.1016/j.biortech.2015.12.027
ISSN:0960-8524
Title of the source (English):Bioresource Technology
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2016
Tag:Biorefinery; Laccase; Lignin; Lignocellulose; Polymerisation
Issue number:203
First Page:96
Last Page:102
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Chemische Reaktionstechnik
Institution name at the time of publication:Fakultät für Umweltwissenschaften und Verfahrenstechnik (eBTU) / LS Chemische Reaktionstechnik
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