离子交换树脂催化合成二苯甲烷二氨基甲酸酯的研究

Study on the Catalytic Synthesis of Methylene Diphenyl Dicarbamate with Ion-exchange Resin Catalyst

二苯甲烷二氨基甲酸酯是非光气合成二苯甲烷二异氰酸酯(MDI)的重要中间体。以离子交换树脂为催化剂,对苯氨基甲酸甲酯与甲醛缩合反应制备二氨基甲酸酯进行了研究,考察了催化剂、反应温度、原料配比、催化剂用量和反应时间对反应的影响。优惠条件:温度100℃,原料配比n(对苯氨基甲酸甲酯)∶n(甲醛)=6∶1,催化剂用量为苯氨基甲酸甲酯质量的10%,反应时间4h。此条件下,二氨基甲酸酯收率为57%,选择性为60%。

The synthesis of methylene diphenyl dicarbamate （MDC） from methyl phenyl carbamate （MPC） and formaldehyde was studied using Ion-exchange resin as catalyst. The main effect factors such as： catalyst, reaction temperature, ratio of materials, catalyst content and reaction time were investigated. The optimized reaction conditions were as follows： 100℃, n （MPC） ： n （HCHO）=6 ： 1, m （catalyst. ）/m （MPC）=10%, reaction time 4 h. Under such conditions the yield of MDC reached 60% and the selectivity of MDC reached 57%.