热解温度对酸沉淀工业木质素快速热解液体产物的影响

利用快速热解和气质联用技术，研究了酸沉淀工业木质素在400℃～700℃下快速热解液体产物的主要组分及其含量的变化。酸沉淀工业木质素快速热解液体产物中主要包括，与木质素的三种苯丙烷结构单元结构相似的苯酚、愈疮木酚和2,6 二甲氧基苯酚等酚类化合物，以及它们的甲基、乙基或丙基的单取代或多取代衍生物。在400℃～600℃，热解液体产物的组分及其相对含量的变化不显著；而在600℃～700℃，芳环上含甲氧基的酚类物质的相对含量急剧减少甚至消失，而苯酚的相对含量却急剧增加，达到27.81％，比400℃的增加了近2.5倍，同时芳烃化合物的相对含量增加，并出现苯丙呋喃、茚和萘等芳环化合物。

Effect of pyrolysis temperature on pyrolysate during fast pyrolysis of industrial lignin made by acid precipitation

Fast pyrolysis of the industrial lignin made by acid precipitation method was investigated at 400℃～700℃，and the liquid pyrolysate obtained was analyzed by Chromatography/Mass Spectrometry (GC MS) to investigate the influence of pyrolysis temperature on the composition of liquid pyrolysate product. The results show that the lignin pyrolysate is composed of single ring phenolic compounds, including phenol(p hydroxyphenyl type) as the main component, guaiacol(guaiacyl type) and 2,6 dimethoxy phenol(syringyl type), and their methlylic or ethylic derivatives. In the temperature range of 400℃~600℃， the variety of the distribution pattern and the yields of the compounds of pyrolysate is minor. However, the proportion of methoxyphenolic compounds decreases significantly and the proportion of phenol increases markdly when the temperature is up to 600℃~700℃. At 700℃, the relative content of phenol reaches to about 27.81% two and half times higher than that at 400℃. In addition, the formation of aromatic hydrocarbons is enhanced, and small amounts of indene, naphthalene and their derivatives are produced as well.