芳烃联合装置抽余液生产间二甲苯工艺的工业应用

COMMERCIAL APPLICATION OF m-XYLENE PRODUCTION PROCESS FROM RAFFINATE OF AROMATICS UNIT

介绍了宁波中金石化有限公司200 kt a间二甲苯(MX)吸附分离装置的运行情况。该装置于2020年建成投产,一次投料开车成功,为全球最大的MX生产装置。装置性能测试结果表明,MX产能达到203.3 kt a,产品纯度(w)为99.53%,单程收率为95.1%。保持吸附剂在合适的水含量范围内可以有效提高吸附剂选择性,提高产品纯度和单程收率;苯为吸附剂的暂时性毒物,解吸剂中苯含量增加会降低吸附分离过程的单程收率。

The industrial operation of a 200 kt a m-xylene adsorptive separation unit of Ningbo ZhongJin Petrochemical Company is introduced.The unit,as the largest m-xylene production unit in the world,was completed and put into operation in 2020.The performance test results show that the capacity of the unit is 203.3 kt a,the purity of the m-xylene product is 99.53%,and the single-pass yield is 95.1%.The appropriate range of water content in the adsorbent is beneficial for the selectivity,which can improve the product purity and yield.Benzene is a temporary poison for the adsorbent,and increasing benzene content in desorbent will reduce the process yield.