Study on the Preparation of Ultra-High-Purity Erbium Chelate Er(C₁₁H₁₉O₂)₃ AITranslate

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Chinese Library Classification Number:TQ133.3[化学工程—无机化工]

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Ultra-high-purity erbium chelate Er(C₁₁H₁₉O₂)₃ was prepared by chelation reaction using 6Ngrade erbium chloride and TMHD(2,2,6,6-tetramethyl-3,5-heptanedione,for the organic ligand)as starting materials.The reaction product was characterized by X-ray diffraction,thermogravimetric-differential thermal analysis,and impurity content measurement.The effects of distillation temperature and time on the purification of TMHD,as well as the effects of TMHD dosage,reaction solution pH value,chelation reaction time,and sublimation cycles on the yield,Er content,and impurity content of the erbium chelate were investigated.The results show that the optimal distillation temperature and time for TMHD purification are 72~73℃and 40 min.The optimum process conditions for Er(C₁₁H₁₉O₂)₃ preparation are as follows:TMHD dosage of 1.1 times the theoretical amount,reaction solution pH value of 7~8,chelation reaction time of 60~70 min,and sublimation cycles of 3.The final product is erbium chelate Er(C₁₁H₁₉O₂)₃ with a purity of 99.9999%,which exhibits good decomposability and complete volatility at high temperature,making it suitable for the preparation of erbium-doped optical fibers.This study provides an efficient and stable process for the preparation of ultra-high-purity erbium chelates.