对二甲苯装置C_8非芳烃循环技术经济分析  

Techno-economic analysis of C_8 non-aromatics recycle in PX unit

作　　者：刘红云[1] 金晓霞[1] 徐又春[1] 伍于璞[1] 

机构地区：[1]中国石化集团洛阳石油化工工程公司,河南省洛阳市471003

出　　处：《炼油技术与工程》2011年第7期61-64,共4页Petroleum Refinery Engineering

摘　　要：以现有0.60 M t/a对二甲苯装置为基础,举出三种既可保证异构化反应进料中有少量的C8非芳烃,又可减轻二甲苯分离系统和吸附系统负荷的工艺方案,并对其进行经济分析比较。方案一仅增加一个循环塔系,公用工程系统不需要改造;方案二改造脱庚烷塔系并增加一个循环塔系,相应的公用工程系统需要改造;方案三增加一个脱非芳烃塔和循环塔,相应的公用工程系统需要改造。结果表明:后两个方案由于能耗过高,均没有效益。方案一虽然在该价格体系有较好的收益。但当原料C8芳烃和主要产品对二甲苯的价差低于1 600 RMB$/t时,该方案也没有效益,而且,该方案使脱庚烷塔的操作达到极限,导致整个装置的弹性丧失。因此,不推荐在装置内设脱C8非芳烃塔和循环塔。Through a case study of a 600,000 TPY PX unit, the three process options which can ensure a little amount of Cs non-aromatics in isomerization feedstock and reduce the load of PX separation system and adsorption system are techno-economically analyzed and compared. In option 1, only one recycle tower is added and no revamping of utility system is required ; In option 2, the deheptanizer is revamped and a new recycle tower is installed. In option 3, a non-aromatic removal tower and a recycle tower are needed and associated utility system requires to be revamped. The analysis comparison concludes that option 2 and option 3 have no profit due to their high energy consumption. Although option 1 has a good economic benefit in specified price system, it also has no profit when price difference between Cs aromatics feed and PX product is lower than 1 600 Yuan （ RMB ￥ ）/t. Whereas, the deheptanizer will reach its operation limit in this option and there is no flexibility in operation. Therefore, installations of Cs non-aromatics removal tower and recycle tower are not recommended in the unit.

关 键 词：对二甲苯装置 异构化 碳八芳烃 分馏 经济分析 

分 类 号：TQ241.13[化学工程—有机化工]