二甲苯异构化催化剂性能对芳烃联合装置运行的影响

EFFECT OF XYLENE ISOMERIZATION CATALYST PERFORMANCE ON THE OPERATION OF AROMATICS COMPLEX

采用迭代分析算法,对比分析不同工艺运行条件下催化剂性能对芳烃联合装置运行的影响。通过调整二甲苯异构化反应器操作条件,控制催化剂处于不同性能,考察了催化剂异构化活性、乙苯转化能力以及产物收率等性能指标对芳烃联合装置回路的影响程度。计算结果表明,新鲜原料的组成对装置的收率、负荷等运行参数的影响最大,歧化料普遍优于重整料,乙苯转化型工艺适应原料能力较强,乙苯脱烷基型工艺则应首选歧化料。乙苯脱烷基型工艺回路更稳定,催化剂的异构化活性、乙苯转化能力以及产物收率对回路迭代结果的影响均很小,在所考察的范围内,回路波动幅度均低于3%。乙苯转化型工艺受催化剂乙苯转化能力的影响更大,装置各项参数约有8%左右的波动,而异构化活性的波动幅度只有3%左右。

Using iterative analysis algorithm,the influence on the operation of aromatics complex by catalyst performance under different process operating conditions is compared and analyzed.By adjusting the operation of the xylene isomerization reactor to control the catalyst performance,and the degree of influence of performance indicators such as isomerization activity(PX/X),ethylbenzene conversion(EBC)and yield on the circuit of the complex unit was independently investigated.The calculation results show that the composition and structure of the fresh feed have the greatest impact on the operating parameters such as the yield and load of the unit.The feedstock from disproportionation unit is generally better than that from the reforming unit.The EB conversion technology is highly adaptable to different feedstock.The EB dealkylation technology should be the first choice for disproportionation stream.The EB dealkylation process loop is more stable,and the three performances of the catalyst have a relatively small impact on the loop iteration results.In the investigated range,the loop fluctuation range is less than 3%.The EB conversion technology is liable to be affected by the EBC activity of the catalyst,which has an impact of about 8%on various parameters of the unit,while the impact range of the PX/X is only 3%.