Characterization of Black Liquors from Soda-AQ Pulping of Reed Canary Grass (Phalaris arundinacea L.)
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Z. Feng
Summary
Reed canary grass (Phalaris arundinacea L.) was delignified in a laboratory-scale digester by conventional soda-AQ pulping under varying conditions. The chemical composition of the corresponding black liquors was analyzed with respect to their main organic constituents. The results showed that the dry solids of the black liquors contained 33–34% lignin, 14–19% aliphatic carboxylic acids and 12–16% polysaccharides. No significant differences were found in the average molecular masses (M̄w 4700–5600 Da and M̄n 650–750 Da) of the dissolved lignins in these black liquors, although the polydispersity (M̄w/M̄n) values (6.6–7.9) indicated that the molecular masses had a wide distribution. Lignin clearly degraded in the black liquors as delignification proceeded. Of the monosaccharide moieties detected in the polysaccharides, xylose was predominant, suggesting that xylan was a major hemicellulose constituent in the black liquors.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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- Changes of EPR Spectra of Wood Impregnated with Copper-Based Preservatives during Exposure to Several Wood-Rotting Fungi
- Quantitative Analyses of Morphological Variation of Cross-Sectional Tracheids of Hinoki (Chamaecyparis obtusa Endl.) Near Knot by Image Processing
- Direct Effects of Wood Characteristics on Pulp and Handsheet Properties of Eucalyptus globulus
- Identification of the Lignan Nortrachelogenin in Knot and Branch Heartwood of Scots Pine (Pinus sylvestris L.)
- Chemical Composition of Lipophilic and Phenolic Constituents of Barks from Pinus nigra, Abies bornmülleriana and Castanea sativa
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