Hydrothermal degradation of hemicelluloses from triploid poplar in hot compressed water at 180–340 °C
| Autor: | Hai-Tao Wang, Diao She, Gao Yuefang, Meizhi Zhai, Junhong Guo, Pai Peng |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics 010405 organic chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Furfural medicine.disease 01 natural sciences Hydrothermal circulation 0104 chemical sciences chemistry.chemical_compound Hydrolysis chemistry Mechanics of Materials Materials Chemistry medicine Monosaccharide Organic chemistry Degradation (geology) Lignin Dehydration 0210 nano-technology Isomerization |
| Zdroj: | Polymer Degradation and Stability. 126:179-187 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2016.02.003 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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