Depolymerization characteristics of cunninghamialanceolata alkali lignin in subcritical water

作者：Li, Xiao-Hong; Wu, Shu-Bin

来源：Chemistry and Industry of Forest Products, 2015, 35(3): 60-66.

DOI：10.3969/j.issn.0253-2417.2015.03.011

• Elemental analyzers
• Energy conversion rates
• Fourier transforms infrared spectroscopies
• Hydrochar
• Liquid products
• Oxygen content
• Reaction temperature
• Sub-critical water

Hydrothermal depolymerization of Cunninghamialanceolata alkali lignin were conducted in a batch autoclave at temperatures of 250-350. The components and characteristics of hydrothermal degraded liquid products and hydrochar were investigated by gas chromatography with mass spectrometry (GC/MS), elemental analyzer and Fourier transforms infrared spectroscopy (FT-IR). The results showed that the least residue (18.66%) was collected at 325. In addition, the relative content of phenols in liquid products was above 80%, and the types and contents of phenols were both increased with the rise of temperature. Guaiacol was the dominant phenol component, represented 17.71 mg/g at 325. With the increase of reaction temperature, reductions of hydrogen and oxygen contents were observed, while the carbon content increased. The optimum carbon and energy conversion rates at 325 were 79.18% and 79.95%, respectively. The chemical structures of hydrochars were similar to alkali lignin at temperatures below 325. However, a serious carbonization of lignin was observed when the temperature was over 350.

• 出版日期2015-6-28
• 单位华南理工大学