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Effects of lignin and hemicellulose contents on dissolution of wood pulp in aqueous NaOH/urea solution

Cellulose (London), 2014, Vol.21 (3), p.1205-1215 [Peer Reviewed Journal]

Springer Science+Business Media Dordrecht 2014 ;Cellulose is a copyright of Springer, (2014). All Rights Reserved. ;ISSN: 0969-0239 ;EISSN: 1572-882X ;DOI: 10.1007/s10570-014-0226-2

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  • Title:
    Effects of lignin and hemicellulose contents on dissolution of wood pulp in aqueous NaOH/urea solution
  • Author: Shi, Zhuqun ; Yang, Quanling ; Cai, Jie ; Kuga, Shigenori ; Matsumoto, Yuji
  • Subjects: Bioorganic Chemistry ; cellulose ; Ceramics ; Chemistry ; Chemistry and Materials Science ; Composites ; delignification ; Dissolution ; Glass ; Glucan ; hemicellulose ; Lignin ; Natural Materials ; Organic Chemistry ; Original Paper ; Physical Chemistry ; Polymer Sciences ; Potassium permanganate ; sodium ; Sodium hydroxide ; softwood ; Solvents ; Sustainable Development ; urea ; Ureas ; wood chips ; Wood pulp
  • Is Part Of: Cellulose (London), 2014, Vol.21 (3), p.1205-1215
  • Description: Four species of delignified woodchips with about 1 % lignin content (Chlorite–Woodchips) and a series of softwood pulps with different lignin contents were prepared by sodium chlorite delignification. After mechanical defibration, some Chlorite–Woodchips were directly subjected to dissolution treatment in NaOH/urea solvent; the others were first treated with NaOH solution to remove the hemicellulose to obtain NaOH–Chlorite–Woodchips or oxidized with potassium permanganate (OPP) to remove lignin completely to obtain OPP–Chlorite–Woodchips, and then subjected to the dissolution in NaOH/urea solvent. The results showed that the dissolved proportion of the Chlorite–Woodchips ranged from 36 to 46 %, the dissolved proportion of glucan was within 12 %, and most of the hemicellulose was dissolved in NaOH/urea solvent. Compared with Chlorite–Woodchips, the dissolved proportion of NaOH–Chlorite–Woodchips was lower, but their dissolved proportion of glucan was higher. After further permanganate delignification, both the dissolved proportion of the OPP–Chlorite–Woodchips and the dissolved proportion of glucan of the OPP–Chlorite–Woodchips were higher than those of the Chlorite–Woodchips. However, the dissolved proportion of glucan was still limited to only 15–30 %. The effect of the lignin content of softwood pulps on their dissolution is complicated. With the decrease of the lignin content of softwood pulp from 6.9 to 2.8 %, the dissolved proportion of pulp increased from 14 to 26 %. However, further reduction of lignin content from 2.8 to 0.3 % led to a decrease in the dissolved proportion of pulp from 26 to 12 %. The dissolved proportion of glucan followed the same tendency. These results indicated that the dissolution of wood cellulose in NaOH/urea solvent is not simply controlled by the hemicellulose and lignin contents, but also by some other factors.
  • Publisher: Dordrecht: Springer-Verlag
  • Language: English
  • Identifier: ISSN: 0969-0239
    EISSN: 1572-882X
    DOI: 10.1007/s10570-014-0226-2
  • Source: Alma/SFX Local Collection
    ProQuest Central
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