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Mild peroxyformic acid fractionation of Miscanthus x giganteus bark. Behaviour and structural characterization of lignin
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2012 (English)In: Industrial crops and products (Print), ISSN 0926-6690, Vol. 35, no 1, 261-268 p.Article in journal (Refereed) Published
Abstract [en]

Miscanthus x giganteus bark was subjected to mild fractionation with peroxyformic acid by a two stage process. A factorial experimental design was used to study and quantify the effect of the variables (formic acid concentration (80-90%), hydrogen peroxide concentration (0.2-0.4%), temperature of the first stage (60-80 degrees C), and treatment time of the second stage (60-120 min)) on the main parameters of fractionation: pulp yield, remaining lignin and total polysaccharides in pulp. The dependence of lignin precipitation rate on hydrogen peroxide concentration in liquor was also studied. Hydrogen peroxide concentrations inferior to 0.5% seems to be suitable to recover high percentages of lignin. The isolated lignin was analysed by 2D-HSQC, (13)C- and (31)P NMR spectroscopy, FTIR spectroscopy, size-exclusion chromatography and chemical analysis. The most important chemical modifications taken place in the lignin during the fractionation were identified: beta-O-4' cleavage and hydrolysis of LC-bond structures. The C9-formula was also determined: C(9)H(6.81)O(2.90)(OCH(3))(0.68)(COOH)(0.07)(OH(Ph))(0.38)(OH(Al))(0.33) .

Place, publisher, year, edition, pages
2012. Vol. 35, no 1, 261-268 p.
Keyword [en]
Miscanthus x giganteus, Peroxyformic acid, Fractionation, Lignin recovery, Lignin characterization
National Category
Agricultural Sciences
URN: urn:nbn:se:kth:diva-47962DOI: 10.1016/j.indcrop.2011.07.013ISI: 000296110700039ScopusID: 2-s2.0-80051917309OAI: diva2:457567
QC 20111117Available from: 2011-11-18 Created: 2011-11-15 Last updated: 2011-11-18Bibliographically approved

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