FCC轻汽油中C5烯烃临氢反应宏观动力学研究

在压力0.5~2.0 MPa、反应温度313~413 K、液体空速2.5~30 h?1的范围内,在管式滴流床反应器中,对C5烯烃在Ni/Al2 O3催化剂上的临氢反应进行了宏观动力学研究.结果表明,C5直链烯烃加氢反应对烯烃的反应级数为1,对氢压的级数为2.16,加氢活化能为21.11 kJ?mol?1;戊烯-1、3-甲基-1-丁烯、2-甲基-1-丁烯双键异构反应对烯烃的反应级数都为1,异构活化能依次为27.6、42.24、79.62 kJ?mol?1.表明了在相同条件下,烯烃加氢反应速率大于异构化反应速率,C5支链烯烃比直链烯烃更难异构.通过对实验数据的拟合得到反应动力学参数和动力学方程,对方程的检验表明,计算值与实验值吻合较好,误差基本在10%以内,表明在实验条件范围内,模型具有较高的可信度,可用于反应过程模拟和反应器的设计.

Hydro-Macrokinetics Study on C5 Olefin in FCC Light Gasoline over Ni/Al2O3 Catalyst

Hydro-macrokinetics of C5 olefin over Ni catalysts were studied in a tubular trickle-bed reactor under the conditions of 0.5~2.0 MPa,313~413 K,LHSV 2.5~30 h?1.The results show that the n-C5= hydrogenation reaction order of the olefins over Ni/Al2O3 catalysts is 1,the reaction order of hydrogen pressure is 2.16,and the hydrogenation activation energy is 21.11 kJ?mol?1.As for pentene-1,3-methyl-1-butene and 2-methyl-1-butene,all their double-bond isomerization reaction orders of the olefins are 1,which indicates that their isomerization reaction rates are proportional to the concentration of olefins.Moreover,their isomerization activation energies are respectively 27.6 kJ?mol?1,42.24 kJ?mol?1 and 79.62 kJ?mol?1,which indicates that the reaction rate of hydrogenation is greater than the isomerization reaction rate,and the isomerization of branched-chain is more difficult than that of the straight-chain olefins with the same carbon numbers.Through correlating the experimental data,the kinetics models of n-C5= hydrogenation reaction were obtained.Comparing the experimental data with the results calculated by the models,the errors between them are less than 10%,which indicates that,under the experiment conditions,the models have high credibility and can be used for process simulation and reactor design.