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- Title
Intrinsic dissolution kinetics and topochemistry of xylan, mannan, and lignin during auto‐hydrolysis of red maple wood meal.
- Authors
Jara, Rory; Lawoko, Martin; van Heiningen, Adriaan
- Abstract
High temperature aqueous treatment of wood is the preferred technology for deconstructing lignocellulosics. Many studies have been carried out on the kinetics and mechanism of hot‐water extraction. However, most were performed in batch or integral plug flow reactors, which are not optimal for measuring intrinsic dissolution kinetics of the lignocellulosic components. Therefore, we used a continuous mixed batch reactor (or Berty reactor) to determine the intrinsic dissolution kinetics of xylan, mannan, and lignin from milled hardwood (Acer rubrum) at three different temperatures (150, 160, and 170 °C) and four constant pH values: 2, 3, 4, and 5. During the initial phase of autohydrolysis (carbohydrate‐free), lignin and (lignin‐free) xylan dissolve starting at a high rate and then a slowly decreasing rate, respectively. This is followed by the dissolution of xylan‐lignin complexes and finally cellulose xylan complexes when cellulose has been significantly hydrolysed. The kinetics and molecular weight distribution of the removed wood polymers are used to describe the topochemistry of autohydrolysis based on recent knowledge of the ultrastructure of hardwood fibres.
- Subjects
LIGNOCELLULOSE; TOPOCHEMICAL reactions; DISSOLUTION (Chemistry)
- Publication
Canadian Journal of Chemical Engineering, 2019, Vol 97, Issue 3, p649
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.23373