重整C_(9)^(+)重芳烃高效分离技术研究  

Study on efficient separation of C_(9)^(+)heavy aromatic hydrocarbons

作　　者：胡珺 王宝生 陈建兵 高明 张英 HU Jun;WANG Bao-sheng;CHEN Jian-bing;GAO Ming;ZHANG Ying(SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co.,Ltd.,Dalian 116045,China;Sinopec Catalyst Dalian Co.,Ltd.,Dalian 116043,China)

机构地区：[1]中石化(大连)石油化工研究院有限公司,辽宁大连116045 [2]中石化催化剂大连有限公司,辽宁大连116043

出　　处：《现代化工》2023年第6期222-226,共5页Modern Chemical Industry

基　　金：中国石油化工集团公司科技项目(CHG21006)。

摘　　要：中国石化某分公司45万t/a芳烃抽提装置投产后,由于上游原料调整,造成二甲苯塔塔底组分终馏点一直较高,汽油调和组分发生变化,导致全厂汽油干点超标,为此,拟将C_(9)^(+)重芳烃送至歧化与烷基转移单元生产二甲苯。目前,C_(9)^(+)重芳烃无法满足进料要求,因此提出新增重芳烃塔、二甲苯塔新增侧线和二甲苯塔改造为分壁精馏塔3种解决方案。通过对C_(9)^(+)重芳烃分离进行模拟,对比分离能耗和产品质量,确定二甲苯塔改造为分壁精馏塔作为C_(9)^(+)重芳烃高效分离方案,同时进行单因变量优化研究。结果表明,回流比为4.4、隔板位置为隔板上方39层塔板处、侧线采出位置为32层塔板、气相分配比为1.024、液相分配比为0.313、进料位置为44层塔板时,C_(9)^(+)重芳烃确定满足歧化与烷基转移单元进料要求,同时分离能耗最低。The final distillation point of bottom components at xylene tower in a Sinopec branch has always been high due to the adjustment of upstream feedstock after the 450,000 tons/year aromatic hydrocarbon extraction unit in the branch started up.The blending components for gasoline have been changed,resulting in that the dry point of gasoline in the whole plant exceeds the standard.Thus,the branch plans to send C_(9)^(+)heavy aromatic hydrocarbon to the disproportionation-alkylation transfer unit to produce xylene.However,C_(9)^(+)heavy aromatic hydrocarbons cannot meet the feeding requirements,so three solutions are proposed as follows:adding a new heavy aromatic hydrocarbon column,adding a new side-line at xylene column and transforming the existing xylene column into dividing wall distillation column.Through simulating the separation of C_(9)^(+)heavy aromatic hydrocarbons and comparing the separation energy consumption and product quality,the third solution is determined as the scheme for efficient separation of C_(9)^(+)heavy aromatic hydrocarbons,and optimized at single dependent variable level.The results show that C_(9)^(+)heavy aromatic hydrocarbon can meet the feeding requirements of disproportionation-alkylation transfer unit and the separation energy consumption is the lowest when the reflux ratio is 4.4,the wall locates at the 39th layer tray,the side production position is at the 32nd layer tray,the gas phase distribution ratio is 1.024,the liquid phase distribution ratio is 0.313,and the feeding position is at the 44th layer tray.

关 键 词：C_(9)^(+)重芳烃 分壁塔 能耗 优化 

分 类 号：TE08[石油与天然气工程]