Abstract: Light olefins,such as ethylene and butadiene,are important basic chemical raw materials. To investigate the effect of temperatures and HZSM-5 molecular sieve with different Si/Al ratios on the production of light olefin,pyrolysis experiment was conducted on a PY-GC-MS. The experiment results showed that the biocrude was an ideal raw material to produce light olefin through cracking. HZSM-5 molecular sieve catalyst had a good catalytic effect on the biocrude cracking; 48% of the maximum total olefin yield could be obtained at 850℃ in the thermal cracking experiment,and the maximum total olefin yield through catalytic cracking was 74% obtained at 600℃. Different Si/Al ratio of the molecular sieve had a significant impact on the pyrolysis products. High Si/Al ratio of the molecular sieve is beneficial to produce ethylene and propylene at low temperatures,while low Si/Al ratio of the molecular sieve could help to produce ethylene and propylene at high temperatures. Besides,high Si/Al ratio of the molecular sieve could help to produce butane at low temperatures,and butadiene at high temperature. The biocrude cracking product distribution could be controlled by changing Si/Al ratio of HZSM-5 molecular sieve.

Key words: biocrude, pyrolysis, olefin, molecular sieve

摘要： 低碳烯烃如乙烯、丁二烯等是一种重要的基础化工工业原料。为了考察不同反应温度和不同硅铝比的HZSM-5分子筛对于生物原油替代油品裂解制取低碳烯烃的影响，在本文裂解-气相色谱-质谱联用仪上进行了裂解实验。通过实验发现，生物原油是一种良好的裂解制取低碳烯烃的原料，HZSM-5分子筛催化剂对生物原油裂解具有较好的催化作用，生物原油热裂解实验在850℃时可以得到48%的最大总烯烃收率，而催化裂解600℃可以获得74%的最大总烯烃收率。分子筛的硅铝比对生物原油裂解过程的催化作用差别比较大。高硅铝比分子筛在低温时有助于生成乙烯和丙烯，而低硅铝比分子筛在高温时有助于生成乙烯和丙烯；高硅铝比分子筛低温时有助于丁烯的生成，而在高温时有助于丁二烯的生成，通过改变HZSM-5分子筛的硅铝比对生物原油裂解产物分布进行调控。

关键词: 生物原油, 裂解, 烯烃, 分子筛