A. A. Shatalov, H. Pereira
Ethanol-Enhanced Alkaline Pulping of Arundo donax L. Reed:
Influence of Solvent on Pulp Yield and Quality
Summary
The effect of solvent on yield and properties of ethanol-alkali pulps from Arundo donax L. was
studied. Selectivity of pulping was significantly improved with increase in solvent proportion in the
cooking liquor. A rise in ethanol concentration from 20 to 60% (by vol.) increased pulp yield from
44.0 to 48.9%, while decreasing residual lignin from 5.0 to 3.0%. Ethanol addition had a positive
effect on preservation of carbohydrate complex against degradation in alkaline medium. Intrinsic
viscosity of cellulose was improved up to 35% and xylan content increased from 8.6 to 12.1% with
increase in ethanol concentration from 20 to 60%. The preservation of minor non-cellulosic polysaccharides
with solvent addition was also observed. The papermaking properties of ethanol-alkali
pulps were best for 20% ethanol content. An increase in solvent charge led to a drop in burst,
tear and tensile pulp strength. Solvent addition assisted the conversion of glucuronic to hexenuronic
acids, whereas the content of HexA in ethanol-alkali pulps of Arundo donax (about
10 ?mol/g) was substantially lower than reported for kraft pulps from wood.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 56, 08/2002
Pages: 507 - 512
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