Ethanol-Enhanced Alkaline Pulping of Arundo donax L. Reed: Influence of Solvent on Pulp Yield and Quality
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A. A. Shatalov
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 μmol/g) was substantially lower than reported for kraft pulps from wood.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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- Wood Density Determination by X- and Gamma-Ray Tomography
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Articles in the same Issue
- Effect of Growth Rate on Fibre Characteristics in Norway Spruce (Picea abies (L.) Karst.)
- Techniques for Measuring Growth Stress on the Xylem Surface Using Strain and Dial Gauges
- Use of Soft Rot Cavities to Determine Microfibril Angles in Wood; Advantages, Disadvantages and Possibilities
- Surface Roughness and Color Change of Copper-Amine Treated Red Maple (Acer rubrum) Exposed to Artificial Ultraviolet Light
- Differences in Resin Acid Concentration between Brown-Rot Resistant and Susceptible Scots Pine Heartwood
- Antioxidant Activity of Abietane-Type Diterpenes from Heartwood of Taiwania cryptomerioides Hayata
- Hydrothermolysis of Flavonoids in Relation to Steaming of Japanese Larch Wood
- Impact of Pulping Conditions on FORMACELL Aspen Lignin: Investigation of Methoxyl and Ester Groups, Carbohydrates, Molar Mass and Glass Transition Temperatures
- Ethanol-Enhanced Alkaline Pulping of Arundo donax L. Reed: Influence of Solvent on Pulp Yield and Quality
- Reflectance FTIR Microspectroscopy for Studying Effect of Xylan Removal on Unbleached and Bleached Birch Kraft Pulps
- Structure of Thermally Modified Wood Studied by Liquid State NMR Measurements
- Detection on Incipient Fungal Attack in Wood Using Magnetic Resonance Parameter Mapping Wood Studied by Liquid State NMR Measurements
- Wood Density Determination by X- and Gamma-Ray Tomography
- The Influence of Wood Specimen Surface Coating on Moisture Movement during Drying
- Study of the System Wood – Coating Material. Part 2.Wood – Solid Coating Material
- Flake Drying Temperature Affects Mat Properties during Pressing
