摘要
以正十四烷(C14)在Pt/SAPO11催化剂上的临氢异构化为模型反应,探索了长链烷烃临氢异构化反应机制和产物分布的变化规律。结果表明,反应遵循含过渡态的平行顺序反应机制。温度升高,转化率、多支链异构体和裂解产物的收率持续升高,单支链异构体收率呈先升高后降低的变化规律;压力升高,转化率降低,单甲基异构体选择性明显提高;空速或n(H2)/n(C14)升高,转化率降低,单甲基异构体选择性呈升高趋势。随着反应转化率的升高,支链靠近碳链中心的单甲基异构体分布先增多然后趋于稳定。在压力0.5～1.5MPa、温度310～330℃条件下进行反应,可获得较佳的产物分布。
The reaction mechanism of hydroisomerzation of n-tetradecane over Pt/SAPO-11 catalyst in a fixed bed down-flow reactor was studied. Results indicated that the reaction followed a parallel-sequential mechanism. As for the product distribution of the reaction, when reaction temperature increased, the total conversion, the yields of the multi-branching isomers and the cracked products kept increase, while the mono-branching isomers presented a tendency of firstly increased and then decreased. When the pressure increased, the conversion decreased, and the selectivity of the mono-methyl isomers increased significantly. When the space velocity or hydrogen to hydrocarbon mole ratio increased, the conversion decreased, and the mono-methyl isomers selectivity presented a tendency of increase. With the increase of conversion, the product distribution with respect to the mono-methyl isomers with the side-chain close to the center of the carbon chain increased at first and then went stabilized. The optimum product distribution was obtained at pressure of 0.5-1.5 MPa, temperature of 310-330°C.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2005年第2期16-22,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
