Condensation Reaction of Methyl N-Phenylcarbamate with Formaldehyde over H尾 Catalyst

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• 作者：Fang Li ; Rui Min ; Jing Li ; Liya Gao ; Wei Xue ; Yanji Wang ; Xinqiang Zhao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：April 2, 2014
• 年：2014
• 卷：53
• 期：13
• 页码：5406-5412
• 全文大小：357K
• 年卷期：v.53,no.13(April 2, 2014)
• ISSN：1520-5045

文摘

The condensation reaction between methyl N-phenylcarbamate (MPC) and HCHO to form methylene diphenyl-4,4鈥?dicarbamate (MDC) over different solid acid catalyst was studied. The results showed that the catalysts with surface Lewis acid sites having higher acid strength favored MDC synthesis. Among the solid acid catalysts, H尾 exhibited good catalytic activity for MPC condensation. Solvents also had an effect on the catalytic activity; protic solvents, methanol, or H₂O, were detrimental, while dimethyl carbonate (DMC) was found to be the most appropriate reaction medium. The optimal reaction conditions consist of a reaction temperature of 160 掳C, a reaction time of 3 h, n(DMC)/n(MPC)/n(HCHO)of 50:1:0.25 and 0.6 g/30 mL DMC catalyst amounts. Under these conditions, the MPC conversion is 37.2%, and the MDC yield (based on HCHO) is 76.4%. The H尾 catalyst could be easily regenerated by calcination, and no significant loss in catalytic activity was observed after five repeat uses.