煤焦油沥青质加氢转化动力学

Kinetics of Coal Tar Asphaltene Hydroconversion

在反应温度为350～410℃,反应时间为30～150min条件下,于高压反应釜内对煤焦油进行催化加氢实验,开展沥青质加氢转化动力学研究,构建沥青质、油、焦炭和气体之间四集总反应动力学模型,根据实验数据拟合一系列动力学参数。结果表明,在催化加氢反应条件下,煤焦油沥青质转化率高达62.1%,主要转变成油相。在沥青质加氢转化动力学模型中,气体、油相和焦炭生成均近似符合一级反应动力学模型。沥青质转化反应活化能较低为44.027 kJ/mol,说明催化加氢反应条件有利于沥青质加氢裂解反应。沥青质转化成油相、气体和焦炭3个平行反应中,活化能分别为76.250,64.107和55.418 kJ/mol,说明在本研究的催化加氢反应条件下,提高反应温度有利于沥青质往油相生成方向进行。

Catalytic hydrogenation of coal tar in a high pressure autoclave at 350-410 ℃ and reaction time of 30-150 min was carried out to study the kinetics of asphaltene hydroconversion,and construct a four lumped total reaction kinetic model among asphaltene,oil,coke and gas. A series of kinetic parameters were fitted according to the experimental data. The results showed that under the condition of catalytic hydrogenation,the conversion rate of coal tar asphaltene was up to 62.1%,which was mainly converted into oil phase. Among the kinetics models of asphaltene hydrogenation conversion,the data fitted neatly first-order kinetics model for gas,oil phase and coke formation. The activation energy of asphaltene conversion was lower at 44.027 kJ /mol,indicating that the catalytic hydrogenation reaction conditions were favorable for the asphaltene hydrocracking reaction. The activation energies that asphaltene converted into oil,gas and coke in three parallel reactions were 76.250,64.107 and 55.418 kJ/mol,respectively. This indicated that under the conditions of catalytic hydrogenation in this study,raising the reaction temperature was beneficial to the asphaltene transform into the oil phase.