Cracking of High Density Polyethylene Pyrolysis Waxes on HZSM-5 Catalysts of Different Acidity

被引：194
作者：
Artetxe, Maite [1 ]
Lopez, Gartzen [1 ]
Amutio, Maider [1 ]
Elordi, Gorka [1 ]
Bilbao, Javier [1 ]
Olazar, Martin [1 ]
机构：
[1] Univ Basque Country UPV EHU, Dept Chem Engn, E-48080 Bilbao, Spain
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2013年 / 52卷 / 31期
关键词：
CONICAL SPOUTED-BED; FLUIDIZED-BED; ZEOLITE CATALYST; NANOCRYSTALLINE HZSM-5; LIGHT OLEFINS; POLYOLEFIN CRACKING; RESIDENCE TIME; MODIFIED ZSM-5; REACTOR; WASTE;
D O I：
10.1021/ie4014869
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
High density polyethylene (HDPE) cracking has been carried out in a thermal-catalytic two-step unit for the selective production of light olefins. Continuous pyrolysis of HDPE has been conducted in a conical spouted bed reactor at 500 degrees C, and the volatiles formed (mainly waxes) have been transformed in a downstream fixed bed catalytic reactor at 500 degrees C. The effect of catalyst acidity on product yield and composition has been studied by using three catalysts based on HZSM-5 zeolites with a SiO2/Al2O3 ratio of 30, 80, and 280. The maximum light olefin yield (58 wt %) has been obtained using the most acidic catalyst (SiO2/Al2O3 ratio of 30), with the individual yields of ethylene, propylene, and butenes being 9.5, 32, and 16.5 wt %, respectively. The results are a clear evidence of the higher efficiency of the two-step reaction system compared to the in situ catalytic pyrolysis (single-step), which is explained by the suitable combination of operating conditions in each one of the steps.
引用
收藏
页码：10637 / 10645
页数：9
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