中文摘要：

针对液体酸存在的设备腐蚀及回收利用问题,利用质子酸酸化的1-乙基-3-甲基咪唑四氟硼酸（[emim]BF4）离子液体（ILs）既作反应溶剂又作催化剂,催化苯氨基甲酸甲酯（MPC）与甲醛缩合制备4,4’-二苯甲烷二氨基甲酸甲酯（4,4’-MDC）反应。考察了反应温度、原料配比、离子液体用量及反应时间等因素对4,4’-MDC合成反应的影响。适宜的反应条件为：70℃、n（MPC）/n（HCHO）=4/1、wt（ILs）/wt（MPC）=4/1、1.5h,此时4,4’-MDC产率为71.7%、选择性为71.9%。借助超声波对反应后的酸化离子液体进行萃取提纯,处理后的酸化离子液体循环使用时其催化活性基本保持不变。

英文摘要：

The synthesis of methylene diphenyl dimethylcarbamate（4,4＇-MDC） from methyl N-phenyl carbamate（MPC） and formaldehyde was investigated in the presence of [emim]BF4 ionic liquid modified with H^＋ as both catalyst and reaction solvent. The influence of reaction temperature, molar ratio of MPC to HCHO, the amount of ionic liquid used and reaction time on 4,4＇-MDC synthesis reaction was studied. Under the suitable reaction conditions of 70℃, n（MPC）/n（HCHO） = 4/1, wt（ILs）/wt（MPC） = 4/1 and reaction time of 1.5 h, the yield and selectivity of 4,4＇-MDC are 71.74% and 71.91%, respectively. The used ionic liquid modified with H^＋ was treated by ultrasonic extraction with CHCl3 and was reused in the condensation reaction, and no significant loss in catalytic activity was observed.