燃料化学学报2011，Vol.39Issue(2)：144-148,5.
KBr催化剂上DMC与苯酚甲基化合成苯甲醚的反应机理研究
Mechanism study of anisole synthesis from o-methylation of phenol with DMC over KBr catalyst
摘要
Abstract
The o-methylation of phenol with DMC to anisole over KBr catalyst was studied by in-sim FT-IR,thermodynamic analysis and reactivity test. FT-IR showed that phenol was activated to generate phenolate over 100 while DMC was not activated even at 200 ℃ by KBr catalyst. Anisole was formed over 150 ℃ on KBr catalyst as FT-IR and reactivity data revealed. Small amount of carboxymethylation product methyl phenyl carbonate (MPC) was detected and its formation was earlier than that of anisole. Thermodynamic analysis and MPC decomposition experiment showed that the reaction of MPC formation was a parallel and reversible side reaction. Methylation reaction mechanism was thus suggested as phenol was activated by KBr to form phenolate,a strong nucleophilic reagent, which attacked DMC methyl carbon to generate anisole when temperature was higher than 150 ℃.关键词
碳酸二甲酯(DMC)/苯酚/氧位甲基化/苯甲醚/原位FT-IR/反应机理Key words
dimethyl carbonate (DMC)/ phenol/ o-methylation/ anisole, in-sim FT-IR/ reaction mechanism分类
化学化工引用本文复制引用
陈冰,赵宁,魏伟,孙予罕..KBr催化剂上DMC与苯酚甲基化合成苯甲醚的反应机理研究[J].燃料化学学报,2011,39(2):144-148,5.基金项目
国家科技部科技支撑计划重大项目(2006BAC02A08). （2006BAC02A08）
