Z. Feng, R. Alén, H. Pakkanen
Characterization of Black Liquors from Soda-AQ Pulping of
Reed Canary Grass (Phalaris arundinacea L.)
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 (M?w
4700–5600 Da and M?n 650–750 Da) of the dissolved lignins in these black liquors, although the
polydispersity (M?w/M?n) 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.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 56, 04/2002
Pages: 298 - 303
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