汽油中烯烃异构和芳构化偶合热力学分析  

A THERMODYNAMICS ANALYSIS ON COUPLING ISOMERIZATION WITH AROMATIZATION OF OLEFINS IN GASOLINE

作　　者：于海卫[1] 刘盛林[1] 刘伟成[1] 王清遐[1] 徐龙伢[1] 

机构地区：[1]中国科学院大连化学物理研究所

出　　处：《石油学报（石油加工）》2007年第2期51-56,共6页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：提出了催化裂化汽油中己烯-1为代表的异构化和芳构化偶合反应的化学平衡模型。该模型涉及18个组分和16个独立的化学反应式。用改进牛顿迭代法进行了热力学计算,结果表明,高压和低温对异构化有利,而低压和高温对芳构化有利。异构化为放热反应,而芳构化为吸热过程,通过该偶合反应可使反应的绝热温度变化幅度变小,使反应容易控制和操作。在模拟催化裂化汽油原料中添加部分丁烯-1和丙烯可以抑制己烯-1的裂解,使生成更多的异构支链烷烃和芳烃,平衡时异构支链烷烃和芳烃的总选择性提高,对催化裂化汽油的改质和提高辛烷值有利。A chemical equilibrium model on isomerization and aromatization of hexene-1, which contains 16 independent chemical equations with 18 components, has been put forward and computed by means of modified Newton＇s iteration. The results showed that high temperature and low pressure were advantage to aromatization, on the contrary, low temperature and high pressure were advantage to isomerization. The change of adiabatic temperature was small during coupling isomerization with aromatization of hexene-1, because both reaction heats were counteracted each other, exothermal reaction for the former and endothermic reaction for the latter. Addition of some butene-1 and propene into FCC （fluid catalysis cracked） gasoline could enhance the selectivities of aromatics and iso-alkanes, resulted from the suppression of hexene-1 cracking, which is advantage to increasing the octane number of upgraded gasoline.

关 键 词：汽油 热力学 异构化 芳构化 偶合 

分 类 号：O623.11[理学—有机化学] O642.4[理学—化学]