Cu/ZrO2催化剂用于二乙醇胺脱氢合成亚氨基二乙酸的研究

用共沉淀法制备的Cu/ZrO₂催化剂进行二乙醇胺催化脱氢合成亚氨基二乙酸，分别考察了催化剂用量、原料配比、反应温度、反应压力和反应时间等因素对反应的影响。结果表明，最佳反应条件为:二乙醇胺68.5 g、去离子水140 g、催化剂的加入量为二乙醇胺质量的20%、n(氢氧化钠)∶n(二乙醇胺)=2.3∶1、反应温度170 ℃、反应压力0.8 MPa和反应时间5 h。在此条件下，亚氨基二乙酸收率可达92.3%。催化剂经重复使用8次后，亚氨基二乙酸收率仍然保持在90%以上。

Dehydrogenation of diethanolamine to iminodiacetic acid over Cu/ZrO2 catalyst

Cu/ZrO₂ catalyst prepared by coprecipitation was used for synthesis of iminodiacetic acid from diethanolamine via dehydrogenation. Effects of operation condition,i.e., catalyst dosage, proportion of reactants，reaction temperature, reaction pressure and reaction time, were investigated. The results showed that iminodiacetic acid yield of 92.3% was obtained under optimal reaction condition as follows: diethanolamine 68.5 g, deionized water 140 g, catalyst dosage=20% mass percentage of diethanolamine, sodium hydroxide to diethanolamine molar ratio 2.3∶1, reaction temperature 170 ℃, reaction pressure 0.8 MPa, reaction time 5 h. The catalyst retained high activity after 8 times of use, with iminodiacetic acid yield of over 90%.