Method for preparing methyl carbamate by taking urea as raw material

The invention belongs to the technical field of preparation of compounds containing amino and carboxyl connected to a same carbon frame from natural products, and particularly relates to a method forpreparing methyl carbamate by taking urea as a raw material. The preparation method of the methyl carbamate comprises the following steps: sequentially introducing urea, methanol and a catalyst into areactor, sealing, and reacting at 130 to 150 DEG C for 4-6 hours to obtain the methyl carbamate, wherein the catalyst comprises titanium dioxide-bismuth oxide supported by silicon dioxide. The content of impurities such as methyl carbamate analogues is low, and the yield of methyl carbamate is high. 本发明属于从天然产物制备含有连在同一碳架上的氨基和羧基的化合物技术领域，具体涉及一种以尿素为原料制备氨基甲酸甲酯的方法。所述氨基甲酸甲酯的制备方法，包括以下步骤：将尿素、甲醇和催化剂依次引入到反应器中，密闭，在130-150℃下反应4-6h即得；所述催化剂包括二氧化硅担载的二氧化钛-氧化铋。采用本发明的方法制备氨基甲酸甲酯，类氨基甲酸甲酯等杂质含量低，氨基甲酸甲酯的收率高。