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%.
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 H4SiW12O40 loading were studied. Suitable reaction conditions are as follows： DMC/aniline/formaldehyde molar ratio is 20/1/0.05, H4SiW12O40 loading is 10%, and reaction temperature is controlled by stages （i. e. , reaction at 443 K for 7 h and then at 373 K for 4.5 h）. Under these conditions, the yield of MDC is 24.9%.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第8期667-669,共3页
基金
国家重大基础研究前期研究专项(2005CCA06100)
国家自然科学基金(20476022).
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
silicotungstic acid
zirconia
bifunctional catalyst
methylene diphenyl dicarbamate
direct synthesis
dimethyl carbonate
aniline
formaldehyde solution
