纤维素CP-GC-MS法裂解行为研究

采用居里点裂解仪-气相色谱仪-质谱仪(CP-GC-MS)联用分析技术,研究了居裂解温度、时间对纤维素快速裂解产物组成及其含量的影响。结果表明,纤维素在居裂解过程中左旋葡聚糖始终是裂解的主体产物;纤维素在300~370℃居裂解主要生成糖类单体化学品;随着居裂解温度的进一步提高,纤维素解聚形成的单体裂解成为其他小分子的醛酮类化合物种类和含量大幅度提高;居裂解时间的增加对CP-GC-MS谱图的色谱峰没有影响,只是居裂解反应的中间体左旋葡聚糖含量降低,其它产物含量保持不变或有所提高;在居裂解温度358℃、居裂解时间1 s时,左旋葡聚糖含量高达73.07%。

Study of Thermal Transformations of Cellulose under Curie-point Pyrolysis-GC-MS Conditions

Abstract-The influence of different Curie-point pyrolysis temperature and time on the relative content of pyrolysis products obtained by Curie-point pyrolysis from the microcrystalline cellulose was investigated by pyrolysis-gas chromatography-mass spec-troscopy(CP-GC-MS).During the Curie-point pyrolysis process,the main component of pyrolysis products was levoglucosan all the time.Under pyrolysis temperature 300-370 t.sugar chemicals were obained from cellulose mostly.With the enhancement of pyrolysis temperature,the kind and content of chemicals of small molecular aldehyde,ketone,which were made from the second reaction of monomer depolymerized from cellulose,were improved greatly.The chromatogram apexes of CP-GC-MS were not changed with the increment of pyrolysis time.Only the relative content of levoglucosan was decreased and the other products were kept the line or increased.The content of levoglucosan reached 73.07 % at the conditions of Curie-point pyrolysis temperature 350 X,,Curie-point pyrolysis time 1 s.