In the presence of the reaction solvent tetrahydrofuran, add nitrogen-containing reagent ammonia into the reactor to react with the raw material, wherein the molar ratio of ammonia to theraw material is 1:1. The reaction temperature is 60°C, the reaction pressure is 1 MPa (gauge pressure), and the reaction time is 8 hours. After the reaction is completed, it is acidified to generate ACES. Then spin off the solvent tetrahydrofuran, add ethyl acetate, wash twice with water, dry with anhydrous sodium sulfate, and spin off the ethyl acetate to obtain the crude ACES. Purification stepIn the reactor, the purified solvent tetrahydrofuran was added to dissolve the crude ACES, recrystallized at low temperature, the insoluble matter was removed by suction, and the filtrate was rotary evaporated to remove tetrahydrofuran to obtain refined ACES.
