中低温煤焦油加氢脱金属动力学研究

Kinetics for Hydrodemetalization of Coal Tar

在小型固定床加氢装置上,用加氢保护催化剂、加氢脱金属催化剂和加氢裂化催化剂对煤焦油进行了加氢脱金属动力学研究。考察了反应温度、氢分压、液态空速等操作参数对加氢脱金属反应活性的影响,建立了煤焦油加氢脱金属反应的动力学模型,通过Levenberg-Marquardt法拟合出各动力学参数,同时采用实测数据对模型进行了验证。实验结果表明,煤焦油加氢脱金属反应为1.2级反应,活化能为53.896kJ/mol,煤焦油加氢脱金属反应与渣油加氢脱金属反应类似;对加氢脱金属影响大小的参数顺序为:液态空速>反应温度>氢分压;动力学模型的相对误差均小于2.7%,该模型可较准确地预测产品中的金属含量。

Hydrodemetalization kinetics of the coal tar from Erdos of Inner Mongolia was studied in a fixed- bed hydrogenation unit on the hydrogenation protection catalyst, the hydrodemetalization catalyst and the hydrocracking catalyst. The influences of reaction temperature, hydrogen partial pressure and liquid hourly space velocity （LHSV） on the hydrodemetalization were investigated. The kintics model for the hydrodemetalization of the coal tar was established. The experimental data were fitted by the Levenberg-Marquardt method. The result indicated that the hydrodemetalization was a 1.2 order reaction and its activation energy was 53. 896 kJ/mol, which was similar to hydrodemetalization of residual oil. The order of the parameters affecting the hydrodemetalization was. LHSV 〉 reaction temperature 〉 hydrogen partial pressure. The model was verified by the experimental data and all the relative errors were less than 2.7 %.