Comparison of Liquid-Phase and Gas-Phase Pure Thermal Cracking of n-Hexadecane
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- 作者：Guozhong Wu ; Yosuke Katsumura ; Chihiro Matsuura ; Kenkichi Ishigure ; and Junichi Kubo
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1996
- 出版时间：December 1996
- 年：1996
- 卷：35
- 期：12
- 页码：4747 - 4754
- 全文大小：185K
- 年卷期：v.35,no.12(December 1996)
- ISSN：1520-5045
文摘
Thermal cracking of n-hexadecane in the mildtemperature (330-375 
C) range has beeninvestigated in liquid and gas phases. The kinetic data ofliquid-phase cracking are shown tobe very similar to those of gas-phase cracking. However, thepattern and distribution of theproducts are greatly phase dependent. In liquid-phase cracking,there is an equimolardistribution of n-alkane and 1-alkene products in theC3-C13 range at low conversion; whentheconversion is increased, more alkanes than alkenes are produced.To the contrary, more alkenesthan alkanes are always determined in products from gas-phase cracking.Liquid-phase crackinggives a low selectivity of gas products and a high selectivity ofaddition compounds (C18-C30),whereas gas-phase cracking produces a large amount of gas products andno addition compounds.The phase dependence of products can be interpreted in terms of alow concentration ofhexadecane, under which 
-scission occurs more preferentially than inliquid phase. Reactionmechanisms are suggested based on the product analysis to account forcracking behaviors ofliquid-phase and gas-phase cracking.
C) range has beeninvestigated in liquid and gas phases. The kinetic data ofliquid-phase cracking are shown tobe very similar to those of gas-phase cracking. However, thepattern and distribution of theproducts are greatly phase dependent. In liquid-phase cracking,there is an equimolardistribution of n-alkane and 1-alkene products in theC3-C13 range at low conversion; whentheconversion is increased, more alkanes than alkenes are produced.To the contrary, more alkenesthan alkanes are always determined in products from gas-phase cracking.Liquid-phase crackinggives a low selectivity of gas products and a high selectivity ofaddition compounds (C18-C30),whereas gas-phase cracking produces a large amount of gas products andno addition compounds.The phase dependence of products can be interpreted in terms of alow concentration ofhexadecane, under which -scission occurs more preferentially than inliquid phase. Reactionmechanisms are suggested based on the product analysis to account forcracking behaviors ofliquid-phase and gas-phase cracking.