Phenol, catechol, guaiacol and syringol, as lignin monomer model compounds, were pyrolyzed in a two-stage tubular reactor, and pyrolysis products were quantified by on-line gas chromatography (GCs). Inorganic gases (IGs), C1~C5 hydrocarbons (C1~C5 LHs), non-aryl oxygen-containing compound, phenols and aromatic hydrocarbon were quantified by GC. The purpose is to determine the effect of hydroxyl and methoxy on the ring-opening reaction of aromatic ring and product distribution during lignin pyrolysis process. Results show that hydroxyl and methoxy can improve the model compound conversion rate, and the existence of hydroxyl and methoxy affects the competition of aryl ring opening reaction, aryl substitution reaction and rearrangement reaction, leading to the obvious products distribution differences in the model compounds pyrolysis. The main products are formed from the ring-opening reaction, including IGs (mass fraction of 27.29%~33.56%) and C1~C5 LHs (20.46%~39.51%). The CO yield (23.82%~29.18%) is improved by hydroxyl, and reduced by methoxy. Methoxy enhances the CO2 formation with its yield in 0.19%~9.61%. Hydroxyl and methoxy reduce the mass selectivity of C1~ C5 hydrocarbon, but promote the formation of alkyl benzene, macromolecular compounds and coke.
Hua-mei YANG,Jing LI,Xi-hua DU. Pyrolysis and product analysis of lignin monomer model compounds. Journal of ZheJiang University (Engineering Science), 2021, 55(5): 976-983.
TC-1701 长度：60 m（0.25 mm i.d.）（capillary column,GL Sciences）
FID
进样口：345 ℃ 检测器：300 ℃ 色谱柱温度：40 ℃保持10 min，以5 ℃/min升温到300 ℃，并保持30 min
苯、二甲基苯、茚、萘、甲基萘、苯酚、甲基苯酚、愈创木酚、紫丁香酚、邻苯二酚
Tab.1Online GC condition setting and detected products
Fig.2Mass selectivity of product groups obtained from lignin model compounds pyrolysis at 750 ℃
Fig.3Mass selectivity of phenols formed from lignin model compounds pyrolysis
Fig.4Mass selectivity of CO and CO2 formed from lignin model compounds pyrolysis
Fig.5Mass selectivity of C1~C5 LHs formed from lignin model compounds pyrolysis
Fig.6Mass selectivity of LOCs formed from lignin model compounds pyrolysis
Fig.7Mass selectivity of AHs formed from lignin model compounds pyrolysis
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