催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (8): 667-669.

• 研究快讯 •    下一篇

一步催化合成二苯甲烷二氨基甲酸甲酯

刘丽敏,李芳,王延吉,赵新强   

  1. 河北工业大学绿色化工与高效节能河北省重点实验室, 天津 300130
  • 收稿日期:2007-08-25 出版日期:2007-08-25 发布日期:2011-08-19

One-Step Catalytic Synthesis of Methylene Diphenyl Dicarbamate

LIU Limin, LI Fang, WANG Yanji*, ZHAO Xinqiang   

  1. Institute of Green Chemical Technology, Hebei University of Technology, Tianjin 300130, China
  • Received:2007-08-25 Online:2007-08-25 Published:2011-08-19

PDF

1402

被引次数

27

摘要： 研究了以H4SiW12O40-ZrO2/SiO2为催化剂,碳酸二甲酯(DMC)、苯胺和甲醛溶液为原料,一步催化合成二苯甲烷二氨基甲酸甲酯(MDC)的反应,考察了反应时间、反应温度和H4SiW12O40负载量等反应条件对催化性能的影响. 适宜的反应条件是: DMC/苯胺/甲醛摩尔比为20/1/0.05, H4SiW12O40负载量为10%, 443 K下反应7 h后降温到373 K下反应4.5 h. 在此优化条件下, MDC的收率为24.9%.

关键词: 硅钨酸, 氧化锆, 双功能催化剂, 二苯甲烷二氨基甲酸甲酯, 一步合成, 碳酸二甲酯, 苯胺, 甲醛溶液

Abstract: Methylene diphenyl dicarbamate (MDC), an intermediate for the production of methylene diphenyl diisocyanate, was directly synthesized from dimethyl carbonate (DMC), aniline, and formaldehyde solution over the bifunctional H4SiW12O40-ZrO2/SiO2 catalyst. The effects of reaction time, reaction temperature, and H4SiW12O40loading were studied. Suitable reaction conditions are as follows: DMC/aniline/formaldehyde molar ratio is 20/1/0.05, H4SiW12O40loading is 10%, and reaction temperature is controlled by stages (i.e., reaction at 443 K for7 hand then at 373 K for 4.5 h). Under these conditions, the yield of MDC is 24.9%.

Key words: silicotungstic acid, zirconia, bifunctional catalyst, methylene diphenyl dicarbamate, direct synthesis, dimethyl carbonate, aniline, formaldehyde solution