Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5201273 | Polymer Degradation and Stability | 2016 | 37 Pages |
Abstract
Hemicelluloses isolated from triploid poplar were subjected to hydrothermal degradation at 180-340 °C. The detailed physicochemical characteristics of hydrothermal degradation products including monosaccharide and XOS, molecular weight, inhibitory and organic compounds were detected by HPAEC, GPC, HPLC, and GC-MS, respectively. An increase in temperature led to a significant decrease in molecular weight and an increase in C2-C5 organic alcohols and acids. More importantly, besides two well-known routes that hemicelluloses are hydrolyzed to monosaccharide, followed by further degraded to furfural, a series of reaction routes was proposed to clarify and explain the mechanisms of the hydrothermal degradation of hemicelluloses from triploid poplar, which involved: (i) a predominant route of fragmentation; (ii) side reactions such as oxidation, dehydration, isomerization/rearrangement, and self-lactonization; (iii) larger molecular fragments from sugars by deoxydation or/and oxidation, followed by self-lactonization; and (iv) very few extensive re-polymerization including esterification and condensation among hemicelluloses and lignin fragments.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Yuefang Gao, Haitao Wang, Junhong Guo, Pai Peng, Meizhi Zhai, Diao She,