Catalytic Cracking of Cycloparafifns Admixed with Oleifns:2. Single-Event Microkinetic (SEMK) Assess

• 作 者: Xue Gaoping Weng Huixin Joris W.Thybaut Guy B.Marin
• 机 构: Research Institute of Petroleum Processing, East China University of Science and Technology, Shangha
• 出 处: 中国炼油与石油化工（英文版）
• 发表日期: 2014年3期
• 关键词: catalytic cracking single-event microkinetic model cycloparafifn oleifn site cov

The developed SEMK model is used to provide an insight into the contribution of individual reactions in the cracking of methylcyclohexane as well as the site coverage by various carbenium ions. The preferred reaction pathways for the conversion of methylcyclohexane are hydride transfer reactions followed by PCP-isomerizations, deprotonation and en-docyclicβ-scission, accounting for 61%, 22%and 12%of its disappearance, respectively, at 693 K and 30%conversion of methylcyclohexane. Protolysis plays a minor role in the cracking of methylcyclohexane. Once cyclic dioleifns are formed, all of them can be instantaneously transformed to aromatics, which are easily interconverted via disproportionation. Judg-ing from the carbenium ion concentrations it is evident that, at the investigated operating conditions, less than 5%of the acid sites are covered by carbenium ions, less than 2%of which corresponds to cyclic type species including allylic ones.