化工进展 ›› 2022, Vol. 41 ›› Issue (6): 2939-2947.doi: 10.16085/j.issn.1000-6613.2021-1405

• 化工过程与装备 • 上一篇    下一篇

基于PX选择性强化的短流程甲苯甲醇甲基化PX生产新工艺

李贵贤1,2(), 张军强1,2, 杨勇1,2, 范学英3, 王东亮1,2()   

  1. 1.兰州理工大学石油化工学院,甘肃 兰州 730050
    2.甘肃省低碳能源化工重点实验室,甘肃 兰州 730050
    3.中国石油兰州石化公司自动化研究院,甘肃 兰州 730060
  • 收稿日期:2021-07-05 修回日期:2021-11-11 出版日期:2022-06-10 发布日期:2022-06-21
  • 通讯作者: 王东亮 E-mail:lgxwyf@163.com;wangdl@lut.edu.cn
  • 作者简介:李贵贤(1966—),男,博士,教授,博士生导师,研究方向为催化反应工程。E-mail:lgxwyf@163.com
  • 基金资助:
    甘肃省科技重大专项(19ZD2GD001);甘肃省高等学校产业支撑计划(2020C-06)

A novel PX production shortcut through PX selectivity intensification in toluene and methanol methylation

LI Guixian1,2(), ZHANG Junqiang1,2, YANG Yong1,2, FAN Xueying3, WANG Dongliang1,2()   

  1. 1.School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
    2.Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, Gansu, China
    3.Automation Institute, PetroChina Lanzhou Petrochemical Company, Lanzhou 730060, Gansu, China
  • Received:2021-07-05 Revised:2021-11-11 Online:2022-06-10 Published:2022-06-21
  • Contact: WANG Dongliang E-mail:lgxwyf@163.com;wangdl@lut.edu.cn

摘要:

基于改性的高硅铝ZSM-5催化剂反应动力学模型,本文探讨了甲苯甲醇甲基化反应中影响对二甲苯(PX)选择性的因素,提出了基于选择性强化的短流程甲苯甲醇甲基化PX生产工艺,并从原料利用率、能耗以及经济指标等角度,与已有工艺进行了对比分析。结果表明,在短停留时间、高甲苯/甲醇进料比、高稀释剂/甲醇进料比、较低反应温度和压力条件下,可以促使PX在二甲苯异构体中的选择性达到99.7 %以上。短流程PX生产工艺规避了二甲苯异构体的分离,具有原料利用率高、能耗低、工艺简单的特点,具有良好的经济性。当前工艺研究进一步提升了甲苯甲醇甲基化PX生产工艺的技术竞争力,利用非石油基的甲醇,有助于形成煤化工和石油化工技术互补、协调发展的新格局。

关键词: 对二甲苯, 甲苯甲醇甲基化, 选择性强化, 反应动力学, 过程系统, 优化设计

Abstract:

Based on the reaction kinetics model for modified ZSM-5 catalyst with high Si/Al ratio, the factors influencing the para-xylene (PX) selectivity for methylation of toluene and methanol were discussed, and a short process for PX production was proposed based on the idea of PX selectivity intensification. The proposed short process was compared with the existing processes from the aspects of raw material utilization, energy consumption and economic indicators. The results showed that the PX selectivity for xylene can reach more than 99.7% under the conditions of short contact time, high toluene/methanol feed ratio, high diluent/methanol ratio, low reaction temperature and pressure. Compared with the existing processes, the short process was of high raw materials utilization rate, low energy consumption, process simplicity and good economy, and avoids the separation of xylene isomers. Hence, the short process had strong technical competitiveness for PX production by toluene methanol methylation.Meanwhile, by using non-petroleum-based methanol, it was helpful to form a complementary and coordinated development mode for coal chemical industry and petrochemical industry.

Key words: para-xylene, methylation of toluene-methanol, selectivity intensification, reaction kinetics, process systems, optimal design

中图分类号: 

  • TQ206