碳二前加氢催化剂工业应用研究

考察了新型碳二前加氢催化剂BC-H-21B在中国石化上海石油化工股份有限公司乙烯装置上稳定运行54个月的工业应用情况。工业应用结果表明,BC-H-21B催化剂性能稳定,抗CO波动能力强,前加氢反应器出口乙炔含量始终小于1×10-6(x),乙烯选择性平均为76.2%,甲基乙炔和丙二烯两者转化率大于50%;根据BC-H-21B催化剂的侧线试验结果和使用经验,制定了BC-H-21B催化剂的抗CO波动的调整方法。合理分配前加氢反应器各段乙炔加氢负荷是提高乙烯选择性的有效手段,一段负荷控制在45%～55%,二段负荷控制在40%～50%,三段负荷控制在5%～10%。BC-H-21B催化剂具有良好的耐C4及C+4组分的能力,在控制绿油生成量和绿油黏稠度方面也大大优于同类进口催化剂。

Industrial Application of C2 Front-End Hydrogenation Catalyst

A novel C2 front-end hydrogenation catalyst BC-H-21B was applied stably in Shanghai ethylene plant for 54 months.The results indicate that the catalyst has good catalytic performance,strong CO fluctuant-resistance and high operating stability.The outlet acetylene content,average selectivity to ethylene,and conversion of methylacetylene and propadiene(MAPD) could always be controlled at less than 1×10-6(x),76.2% and more than 50%,respectively.The adjustment method for CO fluctuant-resistance was established.The rational proportion of acetylene hydrogenation in each stage reactor is an effective means for improving the selectivity to ethylene,which is 45%-55% load in 1st stage,40%-50% in 2nd stage and 5%-10% in 3rd stage.BC-H-21B has good tolerance for feedstock with high C4 and C4+ concentrations,and is better than imported catalysts in the control of the production and thickness of the green oil.