• 专利标题:   Synthesis of disodium iminodiacetate by mixing copper salt solution with zirconium salt solution, sodium citrate solution and graphene oxide dispersion, reacting ethylene oxide and ammonia with catalyst, and reacting with sodium hydroxide.
  • 专利号:   CN107721865-A
  • 发明人:   CHEN D
  • 专利权人:   DONGGUAN LIANZHOU INTELLECTUAL PROPERTY
  • 国际专利分类:   B01J023/72, C07C227/02, C07C229/16
  • 专利详细信息:   CN107721865-A 23 Feb 2018 C07C-227/02 201826 Pages: 7 Chinese
  • 申请详细信息:   CN107721865-A CN10887783 27 Sep 2017
  • 优先权号:   CN10887783

▎ 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.