化工进展 ›› 2023, Vol. 42 ›› Issue (5): 2371-2389.DOI: 10.16085/j.issn.1000-6613.2022-1204

• 工业催化 • 上一篇    下一篇

分子筛催化汽油烷基化降苯技术研究进展

王子健(), 柯明(), 宋昭峥, 李佳涵, 童燕兵, 孙巾茹   

  1. 中国石油大学(北京)理学院,北京 102249
  • 收稿日期:2022-06-28 修回日期:2022-09-18 出版日期:2023-05-10 发布日期:2023-06-02
  • 通讯作者: 柯明
  • 作者简介:王子健(1995—),男,博士研究生,研究方向为化学工程与工艺和能量系统优化。E-mail:757496137@qq.com
  • 基金资助:
    国家自然科学基金(21776505)

Progress in alkylation of gasoline with molecular sieve catalyst for benzene reduction

WANG Zijian(), KE Ming(), SONG Zhaozheng, LI Jiahan, TONG Yanbing, SUN Jinru   

  1. School of Science, China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2022-06-28 Revised:2022-09-18 Online:2023-05-10 Published:2023-06-02
  • Contact: KE Ming

摘要:

随着世界各国环保意识的提高,对汽油中苯含量的要求也越来越严苛。汽油降苯技术主要包括加氢饱和、精馏分离、醚化以及烷基化等技术,其中烷基化技术无论从提高辛烷值还是增加汽油收率方面都具有明显优势。本文综述了目前应用最为广泛的甲醇和轻烃作为烷基化试剂的工艺路线和反应机理,对典型分子筛ZSM-5、MCM-22以及Beta的结构及特点、催化烷基化特性进行了具体分析。并指出:甲醇作为烷基化试剂相比于碳数较高的轻烃,需要更高的反应温度,但对汽油的馏程影响更小。轻烃作为烷基化试剂随着碳数的增加活化温度相应降低,但对汽油的馏程影响较大,且低温条件下促进烯烃的聚合引起分子筛的失活。3种分子筛的应用目前很难兼顾苯转化率、汽油馏程以及能耗,孔道大小适中分子筛的开发、复合分子筛和多级孔分子筛的制备有望成为解决该问题的重要方式。

关键词: 汽油, 苯, 甲醇, 轻烃, 分子筛, 催化

Abstract:

With the increasing awareness of environmental protection, the limitation of benzene content in gasoline is becoming more and more stringent. Benzene reduction technologies of gasoline mainly include saturation by hydrogenation, distillation, etherification and alkylation, among which alkylation technology has obvious advantages in improving the octane number and yield of gasoline. The process and reaction mechanism of alkylation with methanol and light hydrocarbons as alkylation reagents, which are widely used at present, are reviewed. The structure and characteristics of typical molecular sieves ZSM-5, MCM-22 and Beta, and their catalytic alkylation characteristics are analyzed in detail. It is pointed out that methanol, when used as an alkylation reagent, needs higher reaction temperature than the light hydrocarbons with high carbon number, but has less influence on the distillation range of gasoline. When light hydrocarbon is used as alkylation reagent, the activation temperature decreases with the increase of carbon number, but it has a great impact on the distillation range of gasoline, and the deactivation of molecular sieves would take place by their promotion of olefin polymerization at low temperature. At present, the application of the three kinds of molecular sieves is difficult to balance the benzene conversion, gasoline distillation range and energy consumption. The development of molecular sieves with suitable pore size, the preparation of composite molecular sieves and hierarchical porous molecular sieves are expected to solve this problem.

Key words: gasoline, benzene, methanol, light hydrocarbon, molecular sieve, catalysis

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