Synthesis of Iminodisuccinic Acid and Its Chelating Ability
WU Chang-yu,WANG Ya-quan,LI Jing(Key Laboratory for Green Chemical Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China)
(Key Laboratory for Green Chemical Technology,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
Abstract：
Iminodisuccinic acid(NH(COOHCHCH_2COOH)_2,IDS) is a green chelating agent with amino and polycarboxylic groups,which forms strong water-soluble complexes with various metal cations and is readily biodegradable.IDS was synthesized with maleic anhydride(MA),ammonia(NH_3)and NaOH in an aqueous medium.The process and principle of the synthesis were discussed.The effects of temperature,raw material ratio,reaction time on the yield product were analyzed.The better conditions were found as follows: MA∶NaOH∶NH_3∶H_2O(mol ratio)=2∶3∶2∶16,160 ℃,10.0 h.Under these conditions,up to 80.0% yield of iminodisuccinic acid was obtained.The results indicated that iminodisuccinic acid might be formed through the formation of aspartic acid as the intermediate.The chelating ability of IDS was studied and was compared with EDTA and the results showed that the chelating ability of IDS for many metals was similar to that of EDTA.
WU Chang-yu,WANG Ya-quan,LI Jing.Synthesis of Iminodisuccinic Acid and Its Chelating Ability[J]. Chemcial Industry and Engineering, 2007,24(2): 121-124
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2007, Vol. 24 
