▎ 摘　　要

NOVELTY - Synthesis of disodium iminodiacetate comprises mixing graphite oxide and deionized water, and oxidizing to get graphene oxide dispersion; mixing copper salt solution with zirconium salt solution, adding sodium citrate solution and graphene oxide dispersion, and sonicating; adding sodium hydroxide solution, mixing, reacting, washing precipitates with water, drying, and reacting with hydrogen to get supported catalyst; reacting ethylene oxide and ammonia with hollow silica catalyst and collecting diethanolamine; and reacting diethanolamine and sodium hydroxide with supported catalyst. USE - Method for synthesizing disodium iminodiacetate. ADVANTAGE - The method has high conversion rate, high yield, high catalyst activity, small dosage and low cost. DETAILED DESCRIPTION - Synthesis of disodium iminodiacetate comprises: (A) mixing graphite oxide and deionized water, stirring uniformly, and performing ultrasonic oxidation for 10 minutes at 500 W to obtain graphene oxide dispersion; (B) using deionized water as solvent, and preparing copper salt solution with concentration of 0.1-0.4 mol/L, zirconium salt solution with concentration of 0.1-0.4 mol/L, sodium citrate solution with concentration of 0.05 mol/L, and sodium hydroxide solution with concentration of 0.5-2 mol/L; (C) mixing copper salt solution with zirconium salt solution, adding sodium citrate solution, stirring and mixing for 20 minutes, adding graphene oxide dispersion, and sonicating at 1000 W for 30 minutes to obtain first mixed liquid; (D) adding first mixed liquid and sodium hydroxide solution to reactor, stirring and mixing to obtain second mixed solution, transferring to autoclave, reacting at 150-180 degrees C for 5 hours, cooling mixture to room temperature, filtering reaction product, washing precipitates with deionized water for 3-5 times, drying to obtain mixed powder, placing mixed powder in tube-type electric furnace, and using hydrogen as reaction gas for 4-8 hours to obtain supported catalyst; (E) using ethylene oxide and ammonia as raw materials, using semi-opened hollow silica as catalyst, contacting raw materials with catalyst, reacting, separating product, distilling ammonia, and collecting diethanolamine; and (F) reacting diethanolamine and sodium hydroxide with supported catalyst at 105-160 degrees C and 0.5-1.0 MPa.