石油炼制与化工

• 基础研究 •    下一篇

烷基芳烃裂化反应性能及生成苯的反应路径

魏晓丽 谢朝钢 龙军 张久顺   

  1. 石油化工科学研究院 石油化工科学研究院 石油化工科学研究院 石油化工科学研究院
  • 收稿日期:2009-08-28 修回日期:1900-01-01 出版日期:2010-02-12 发布日期:2010-02-12
  • 通讯作者: 魏晓丽

CRACKING REACTIVITY OF ALKYLAROMATICS AND THE REACTION PATHWAY OF BENZENE FORMATION

Xiaoli Wei Chao-Gang Xie   

  • Received:2009-08-28 Revised:1900-01-01 Online:2010-02-12 Published:2010-02-12
  • Contact: Xiaoli Wei

摘要: 以甲苯、异丙苯、正戊基苯和苯基环已烷为模型化合物,研究了烷基芳烃在酸性催化剂上的裂化反应性能及生成苯的化学反应路径。结果表明,甲苯很难发生裂化反应,苯的生成主要来自甲苯歧化反应;当烷基苯取代基碳原子数在3以上时,烷基苯裂化反应性能随着烷基侧链碳原子数的增加而增加,烷基侧链含有叔碳原子则更易裂化,苯的生成主要来自脱烷基反应;随着烷基苯取代基碳原子数的增多,烷基芳烃的侧链裂化反应选择性增加,可利用此反应特性控制反应路径,达到降低汽油苯含量的目的。

关键词: 烷基芳烃, 苯, 裂化, 反应, 正碳离子

Abstract: The reactivity of alkylaromatics and reaction pathways of benzene formation during alkylaromatics cracking over acidic catalyst were investigated under a reaction temperature range of 450~600℃ using toluene, cumene, n-amylbenzene and phenylcyclohexane as model compounds. Test results show that under the reaction conditions toluene is hard to crack and the formation of benzene is mainly by disproportionation. When the number of side chain carbon is over 3, these alkylaromatics are prone to side chain cracking and benzene is mainly formed by dealkylation. Furthermore, with the increase of carbon number in the side chain,the selectivity of side chain cracking increases, thus, the formation of benzene is reduced.

Key words: alkylaromatics, benzene, cracking, reaction, carbocation