Relationship of thermal degradation behavior and chemical structure of lignin isolated from palm kernel shell under different process severities
| Autor: | Jiewang Ye, Dengyu Chen, Youyou Yang, Shurong Wang, Junhao Wang, Hanzhi Zhou, Zhongqing Ma, Xiaohuan Liu, Yu Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
020209 energy
General Chemical Engineering Chemical structure Organosolv Energy Engineering and Power Technology Ether 02 engineering and technology Raw material 021001 nanoscience & nanotechnology chemistry.chemical_compound Fuel Technology chemistry Palm kernel 0202 electrical engineering electronic engineering information engineering Lignin Phenols 0210 nano-technology Pyrolysis Nuclear chemistry |
| Zdroj: | Fuel Processing Technology. 181:142-156 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/j.fuproc.2018.09.020 |
| Popis: | Lignin has been considered to be a potential feedstock to produce phenols chemicals by fast pyrolysis technology because of its aromaticity. In this work, four types of lignin were isolated from palm kernel shell with different severities: milled wood lignin (MWL), alkali lignin (AL), Klason lignin (KL), and organosolv ethanol lignin (OEL). A deep investigation of the relevance of the pyrolysis behaviors and chemical structure was carried out by FTIR, GPC, 2D-HSQC-NMR, TGA-FTIR and Py-GC/MS. AL contained highest content of β-O-4 aryl ether bond (53.9/100 Ar) and highest value of S/G ratio (1.68). MWL showed the widest temperature range (126–536 °C) of thermal degradation because of its inhomogeneous distribution of molecular weight. Highest content of oxygen-containing non-condensable gas components (H2O, CO2, CO) was observed in AL. The dominant organic components from lignin pyrolysis were S-type phenols, G-type phenols, P-type phenols, and C-type phenols. G-type (9.74–26.01%) was the dominant phenols products in AL, while P-type (44.23–56.01%) for KL, P-type (29.38–56.07%) for OEL, and G-type (9.08–25.81%) and P-type (22.60–29.04%) in MWL. Higher pyrolysis temperature promoted the formation of aromatics. As the conversion rate increased from 0.1 to 0.8, the activation energy estimated from DAEM model of four types of lignin, all gradually increased. |
| Databáze: | OpenAIRE |
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