关键词: 生物原油, 裂解, 烯烃, 分子筛

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