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Dissolution and dispersion of spruce wood components into hot water

Wood science and technology, 1997-08, Vol.31 (4), p.279-290 [Tạp chí có phản biện]

1997 INIST-CNRS ;Wood Science and Technology is a copyright of Springer, (1997). All Rights Reserved. ;ISSN: 0043-7719 ;EISSN: 1432-5225 ;DOI: 10.1007/BF00702615 ;CODEN: WOSTBE

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  • Nhan đề:
    Dissolution and dispersion of spruce wood components into hot water
  • Tác giả: Orsa, F ; Holmbom, B ; Thornton, J
  • Chủ đề: Applied sciences ; Arabinose ; Carbohydrates ; Dispersion ; Dissolution ; Electrolytes ; Exact sciences and technology ; hot water treatment ; Lignans ; lignin ; Lipophilic ; mechanical pulping ; Paper, paperboard, non wovens ; Pectin ; pH effects ; Picea abies ; Pine trees ; Polymer industry, paints, wood ; Polysaccharides ; Pulp ; Pulp manufacturing ; Saccharides ; Starch ; Triglycerides ; Water temperature ; Wood ; wood pulp ; Wood. Paper. Non wovens
  • Là 1 phần của: Wood science and technology, 1997-08, Vol.31 (4), p.279-290
  • Mô tả: The dissolution and dispersion of components from Norway spruce (Picea abies) wood were examined in laboratory experiments to determine the factors influencing variations in dissolved and colloidal substances in mechanical pulp suspensions. Finely ground, fresh spruce wood was suspended in water at 90 degrees C and was agitated intensively for up to 12 h, after which the concentrations of dissolved and dispersed lipophilic extractives, lignans, carbohydrates and lignins were determined. Sapwood and heartwood were studied separately. Effects of pH and added electrolytes on the dissolution and dispersion of wood components were also investigated. Higher amounts of lipophilic extractives, and especially of triglycerides, were dispersed from sapwood than from heartwood. The release of lipophilic extractives continued for up to 3 h, after which the concentrations in the suspensions leveled off. At this stage the composition of the dissolved and dispersed lipophilic extractives equaled that of the wood. The amount of lipophilic extractives in the suspensions increased with increased pH, in the range of 4.5-6.7, but was lower in the presence of electrolytes. The dissolution of carbohydrates continued even beyond 3 h of agitation. The high water temperature induced hydrolytic reactions, thereby releasing especially arabinose. The release of arabinose through the hydrolytic cleavage from polysaccharides was more extensive at pH 4.5 than at pH 5.5 and 6.7. More polysaccharides containing galacturonic acid units (pectins) were dissolved at a higher pH. Much more polysaccharides containing glucose, most probably starch, were present in the sapwood suspensions. The dissolution of lignins also continued throughout the 12 h experiment. The measured UV-absorption, after extraction of lignans, was roughly the same for sapwood and heartwood suspensions. Slightly less lignins were released in the presence of electrolytes. Lignans were released only from heartwood.
  • Nơi xuất bản: Berlin: Springer
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0043-7719
    EISSN: 1432-5225
    DOI: 10.1007/BF00702615
    CODEN: WOSTBE
  • Nguồn: Alma/SFX Local Collection
    ProQuest Central
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