Method for preparing tetrabutyl urea through ethanol method

The present invention discloses a method for preparing tetrabutyl urea through an ethanol method. The method comprises: dissolving bis(trichloromethyl)carbonate in ethanol; adding water to dibutylamine, and uniformly stirring; slowly adding the ethanol solution of the bis(trichloromethyl)carbonate to the dibutylamine aqueous solution, controlling the material adding temperature at less than 39 DEG C, and controlling the reaction temperature at 21-38 DEG C after completing the material adding, wherein the reaction time is 1-8 h; and after completing the reaction, separating the organic phase and the water phase, carrying out water washing on the organic phase, and drying to obtain the tetrabutyl urea, wherein the separated water phase is added with sodium hydroxide, and the organic phase is separated to obtain dibutylamine so as to be directly used for the synthesis reaction and be recycled. According to the present invention, the method uses the low-toxicity ethanol as the solvent, the obtained product has the high purity, and the method has characteristics of simpleness, convenience, safety, and strong operability.