煤基石脑油芳烃抽提的实验与模拟

Experiment and simulation of coal-based naphtha aromatics extraction

以煤热解耦合煤焦油加氢制得的低芳煤基石脑油为原料,分配系数、选择性系数、芳烃脱除率和萃余油收率为考察指标,探究不同萃取剂对脱芳效果的影响。最终得到复合萃取剂V(二甲基亚砜)∶V(N,N-二甲基甲酰胺)=9∶1,脱芳效果较好。针对此复合萃取剂,利用Aspen Plus对芳烃抽提的工艺过程进行模拟。优化分析了抽提塔的各工艺参数对脱芳效果的影响,并得到了一套适宜的工艺参数:剂油比0.9∶1,进料温度45℃,理论塔板数35块,压力0.4 MPa。且各因素对芳烃脱除率的影响大小依次为剂油比>进料温度>理论塔板数>压力。在此工艺参数下,得到原料的芳烃脱除率为95.81%,萃余油收率为77.43%。

The low aromatic coal naphtha prepared by coal pyrolysis coupling coal tar hydrogenation was used as raw material, and the partition coefficient, the selectivity coefficient, the aromatics removal rate and the yield of raffinate oil were taken as indexes to investigate the effects of different extractants. The results show that the best of the composite extractant is V （dimethylsulfoxide） ： V （N, N-dimethylformamide ） = 9 ： 1. Aiming at this composite extractant, the process of aromatics extraction was simulated by Aspen Plus. The optimum process parameters are obtained as follows ： the ratio of oil to oil is 0.9 ： 1, the temperature of feed is 45 ℃, the number of theoretical plates is 35, and the pressure is 0.4 MPa. The effect of various factors on the removal rate of aromatics is in the order of oil to oil ratio 〉 feed temperature 〉 theoretical plate number 〉 pressure. Under these conditions, the removal rate of aromatics is 95.81% and the yield of raffinate is 77.43%.