【摘要】 采用居里点热裂解-气相色谱-质谱(CP-GC-MS)联用分析技术,以碱木质素为原料,研究了裂解温度对木质素快速裂解产物组成及其含量的影响。结果表明,木质素居裂解主要生成酚类化合物,GC含量可达60%。低温主要生成愈创木酚结构单元为主体的酚类化合物;在300~360℃之间,酚类化合物GC含量随裂解温度升高而提高,愈创木酚基本单元类化合物占主体,占酚类化合物的90%左右;裂解温度进一步提高,酚类化合物GC含量稳定在60%左右,而愈创木酚基本结构单元类化合物GC含量随温度升高而降低,主要由于愈创木酚基本结构单元断裂成其他酚类和小分子化合物。更多还原

【Abstract】 The influence of temperature on the relative content of pyrolysis products obtained by Curie-point pyrolysis from alkali-lignin,which was considered as the model compound of lignin,was investigated by Curie-point pyrolysis-gas chromatography-mass spectroscopy(CP-GC-MS).The results showed that phenolic compounds up to GC content 60 % were prepared by the Curie-point pyrolysis of lignin.The process of Curie-point lignin pyrolysis could be divided into three areas.In the area of less than 300 ℃,lignin was pyrolyzed into phenolic compounds mostly made up of guaiacol-unit.In the area between 300 ℃ and 360 ℃,GC content of phenolic compounds were improved greatly with the enhancement of pyrolysis temperature.Guaiacol-unit compounds reached to 90 % of phenolic compounds.In the area of more than 360 ℃,the GC content of phenolic compounds kept to about 60 %,while the GC content of guaiacol-unit compounds was reduced with the increase of pyrolysis temperature,because guaiacol-unit was broken to form other phenolic compounds and small molecular substances,such as methyl alcohol.更多还原