I-350型C8芳烃异构化催化剂工业应用

福建联合石油化工有限公司芳烃联合装置异构化催化剂原采用某乙苯转化型催化剂,为扩能需要将催化剂更换为环球公司研制的乙苯脱乙基型催化剂I-350（I-350催化剂）.介绍了I-350催化剂的性质、异构化反应器改造和催化剂装填及钝化情况,并对I-350催化剂进行了标定.结果表明：I-350催化剂的乙苯转化率为66.8％,异构化率为23.1％,C8芳烃环损失为1.5％,说明该催化剂具有良好的乙苯转化能力、异构化性能和选择性能.催化剂更换后,吸附分离进料中的对二甲苯含量、对二甲苯和苯的产量、脱庚烷塔顶干气量均得到显著提高,实现了芳烃联合装置的扩能降耗目标.最后分析了催化剂异构化率低于保证值的原因,提出了增加1条抽余液塔顶到重整油分离塔的管线、降低压缩机转速、优化脱庚烷塔操作、停用高分罐底泵、改造干气流程、优化供氢流程等优化措施.

Commercial application of I-350 catalyst for C8 aromatics isomerization

1-350 C8 dimethyl benzene isomerization catalyst developed by UOP was commercially applied in the xylene isomerization unit at Fujian Refining ＆ Petrochemical Co. , Ltd. （FRPC） to replace the original EB conversion catalyst for expanding the unit capacity. The properties of 1-350 catalyst, isomerization reactor revamping, catalyst loading ＆ passivation and performance tests are introduced. The performance test results showed that 1-350 catalyst exhibited good catalytic performances, the conversion of ethylbenzene reached 66.8%, the isomerization activity of xylene reached 23.1%, and the C8 aromatic loss was 1.5%. It indicates that the catalyst offers good conversion performance of ethylbenzene, high isomerization performance and good selectivity. After replacement of the catalyst, the PX concentration in the feed of the Parex unit and the pro- duction of PX and benzene and dry gas of the deheptanizer overhead were obviously raised, achieving the ob- jectives of expanding capacity and reducing consumption of the aromatics complex. The causes why the isomer- ization activity of xylene is lower than the guarantee value is analyzed. Optimization measure are recommen- ded, such as addition of a line from raffinate column overhead to reformate splitter, reduction of the speed of the recycle compressor, optimization of the operation of deheptanizer, shutdown of separator pumps, revam- ping of dry gas process and improvement of hydrogen supply process, etc.