二甲苯异构化催化剂的开工投料方法优化  

Optimization of starting up method for xylene isomerization catalyst

作　　者：王勇 梁战桥[2] Wang Yong;Liang Zhanqiao(Hainan Refining&Chemical Co.,Ltd.,Sinopec,Haikou 578101,Hainan,China;Research Institute of Petroleum Processing,Sinopec,Beijing 100083,China)

机构地区：[1]中国石化海南炼油化工有限公司,海南海口578101 [2]中国石化石油化工科学研究院,北京100083

出　　处：《工业催化》2022年第7期63-67,共5页Industrial Catalysis

摘　　要：芳烃联合装置规模越来越大,新鲜C_(8)芳烃原料的组成变化也较大,乙苯转化型二甲苯异构化催化剂投料开工时更易出现温升较大、循环氢气纯度较低等现象,易造成压缩机联锁、换热器泄漏风险、投料过程中停工、异构化工艺参数调整过程时间长等问题。总结了芳烃装置历次开工的数据,对催化剂投料过程中的难点分析,结合中国石化石油化工科学研究院(石科院)RIC-270系列乙苯转化型二甲苯异构化催化剂、大型芳烃装置的特点,优化催化剂投料开工过程方法,并在工业装置上进行实施。结果表明,通过优化原料组成、增大补充氢气流量、降低投料压力并及时下调压力等多方面的措施,可以实现投料开工过程平稳,避免超温、压缩机联锁等问题,该方法可以推广应用到类似催化剂体系的开工。With the increasing scale of the aromatics unit,the composition of fresh C_(8) aromatics feedstock changes greatly,and the catalyst of ethylbenzene conversion type xylene isomerization tends to have higher temperature rise and lower purity of circulating hydrogen when it is put into operation,it is easy to cause problems such as interlock of compressor,risk of heat exchanger leakage,shut down in start-up process and long time in adjusting process parameters of isomerization.Based on the analysis of the difficulties in the process of catalyst feeding,combined with the characteristics of the RIC-270 series of xylene isomerization catalyst for conversion of ethylbenzene and large-scale aromatics unit,the method of catalyst feed-in and start-up process was optimized and carried out in an industrial plant.The results show that by optimizing the composition of feed,increasing the flow of make-up hydrogen gas,reducing the feeding pressure and lowering the pressure in time,the starting process of feeding can be stable,and the problems such as over-temperature and interlock of compressors can be avoided,the method can be applied to the starting of similar catalyst system.

关 键 词：有机化学工程 二甲苯异构化催化剂 开工投料 原料组成 投料压力 

分 类 号：TQ426.95[化学工程] TE624.9[石油与天然气工程—油气加工工程]