炼油技术与工程 ›› 2021, Vol. 51 ›› Issue (9): 20-23.

• 加工工艺 • 上一篇    下一篇

异构级二甲苯生产工况分析及优化措施

杨俊1, 王腾雪2, 石晶1   

  1. 1.中国石油兰州石化公司炼油厂,甘肃省兰州市 730060;
    2.中国石油兰州石化榆林化工有限公司,甘肃省兰州市 719199
  • 收稿日期:2021-04-08 发布日期:2021-11-12
  • 作者简介:杨俊,工程师,现从事连续重整-芳烃抽提装置工艺技术管理工作。联系电话:17793100913,E-mail:171387757@qq.com。

Analysis and optimization measures of isomeric xylene production conditions

Yang Jun1, Wang Tengxue2, Shi Jing1   

  1. 1. Refinery of PetroChina Lanzhou Petrochemical Company,Lanzhou,Gansu 730060;
    2. PetroChina Lanzhou Petrochemical Company,Yulin Chemical Co., Ltd., Lanzhou, Gansu 719199
  • Received:2021-04-08 Published:2021-11-12

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摘要： 异构级二甲苯是芳烃化工重要的基础原料。2019年9月,中国石油兰州石化公司800 kt/a连续重整装置已经实现由溶剂级二甲苯向异构级二甲苯的质量升级。分析了异构级二甲苯生产初期的工况,认为异构级二甲苯的馏程和溴指数在控制手段上存在可优化空间。提出了优化措施:将第三反应器较第一、二反应器反应温度提高1 ℃,第四反应器反应温度降低1~2 ℃,重整油分馏塔使用APC控制(先进过程控制),二甲苯塔温差设定在17.6~18.5 ℃,更换白土塔新旧剂串联顺序等,二甲苯收率由22.27%提高至24.50%,保证了异构级二甲苯的长周期生产。

关键词: 芳烃, 异构级二甲苯, 反应条件, 操作优化

Abstract: Isomeric xylene is an important basic raw material for aromatic chemical industry. In September 2019, the 800,000 TPY continuous reforming unit of PetroChina Lanzhou Petrochemical Company has realized the quality upgrading from solvent grade xylene to isomeric xylene. Through the analysis of the initial production conditions of isomeric xylene, it is concluded that the distillation range and bromine index of isomeric xylene can be optimized. The optimization measures are put forward: the reaction temperature of the third reactor is 1 ℃ higher than that of the first and second reactors, the reaction temperature of the fourth reactor is 1~2 ℃ lower than that of the first and second reactors, APC (advanced process control) is used for reforming oil fractionator, the temperature difference of xylene tower is set at 17.6~18.5 ℃, and the series sequence of the new and old reagents in clay tower is changed. The yield of xylene increases from 22.27% to 24.50%, which ensures the long-term production of isomeric xylene.    

Key words: aromatic hydrocarbon, isomeric xylene, reaction condition, operation optimization