催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (7): 615-618.

• 研究论文 • 上一篇    下一篇

同位素示踪研究K2CO3/CH3I促进的碳酸二甲酯直接合成反应

蔡振钦1,2,徐春明1,赵锁奇1,许志明1,孙学文1,张民1   

  1. 1 中国石油大学(北京)重质油国家重点实验室, 北京102249; 2 中国石油化工集团洛阳石油化工工程公司工程研究院, 河南洛阳 471003
  • 收稿日期:2006-07-25 出版日期:2006-07-25 发布日期:2006-07-25

Isotopic Tracer Study on Mechanism of Direct Synthesis of Dimethyl Carbonate Promoted by K2CO3/CH3I

CAI Zhenqin1,2*, XU Chunming1, ZHAO Suoqi1, XU Zhiming1, SUN Xuewen1, ZHANG Min1   

  1. 1 State Key Laboratory of Heavy Oil processing, China University of Petroleum, Beijing 102249, China; 2 Engineering Research Institute of Luoyang Petrochemical Engineering Corporation,China Petrochemical Group, Luoyang 471003, Henan, China
  • Received:2006-07-25 Online:2006-07-25 Published:2006-07-25

PDF

748

被引次数

32

摘要： 采用同位素示踪技术,系统地研究了K2CO3/CH3I促进的CO2插入甲醇直接合成碳酸二甲酯(DMC)的反应机理. 结果表明,固体碱碳酸钾催化剂直接参与了DMC的合成过程, DMC分子中的羰基由CO2插入甲醇后形成,两个甲基分别来源于甲醇和碘甲烷. 本文将以往文献中提出的DMC生成机理和二甲醚生成机理结合起来,并对其进行适当补充后,可以很好地解释实验结果.

关键词: 碳酸二甲酯, 合成, 碳酸钾, 碘甲烷, 同位素示踪, 反应机理

Abstract: Direct synthesis of dimethyl carbonate (DMC) by CO insertion into methanol promoted by K2CO3/CH3I was studied by the isotopic tracer technique. It is confirmed that the base catalyst K2CO3 participates in the synthesis process. The carbonyl group of DMC is formed by CO2 insertion, and the two methyl groups of DMC are from methanol and iodomethane, respectively. the DMC formation and the dimethyl ether formation follows the mechanisms proposed in the literature, and the combination of the former mechanisms can well explain the experimental results.

Key words: dimethyl carbonate, synthesis, potassium carbonate, iodomethane;isotopic tracing, mechanism