正辛烷脱氢生成直链烯烃的热力学分析  

A Thermodynamic Analysis on Dehydrogenation of n-Octane to Octenes

作　　者：于宁[1] 王铭[1] 秦岭[1] 龙军[1] 马爱增[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2016年第4期762-766,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司项目(R14056)资助

摘　　要：计算了不同反应条件下正辛烷脱氢生成直链烯烃的主反应热力学平衡参数。计算结果显示,ΔH随温度上升变化不大,正辛烷脱氢反应的平衡常数较小。反应平衡时的产物中,1-辛烯含量最少,顺-4-辛烯次之;产品中绝大部分是双键位于第2到第4碳的烯烃,并且反式辛烯的物质的量大于相应的顺式。温度是一个很敏感的热力学参数,随着温度的升高,正辛烷的平衡转化率呈较大幅度的增加;增加体系压力和氢/烃摩尔比可以明显降低正辛烷的平衡转化率,同时这些参数处于较低值时的影响较大。Thermodynamic equilibrium parameters of n-octane dehydrogenation to octenes were calculated in detail. The calculated results showed that ΔH of n-octane dehydrogenation changed little with the increase of temperature and the equilibrium constants were small. In the equilibrium products the amount of 1-octene was the least, the amounts of 2- to 4-octenes were the most, and the mole number of trans-octene was more than that of the corresponding cis-octene. Reactant temperature was a very sensitive thermodynamic parameter. As temperature increased, the equilibrium conversion of n-octane relatively substantially increased. The equilibrium conversion was significantly reduced with the increases of the pressure and the molar ratio of H2to n-octane, at lower values of which the equilibrium conversion was more sensitive. © 2016, Science Press. All right reserved.

关 键 词：正辛烷 烷烃脱氢 热力学 平衡组成 

分 类 号：TE624[石油与天然气工程—油气加工工程]