Synthesis of Iminodisuccinic Acid and Its Chelating Ability

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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.

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Received 2007-03-15; published 2007-03-15

Cite this article:

WU Chang-yu,WANG Ya-quan,LI Jing.Synthesis of Iminodisuccinic Acid and Its Chelating Ability[J] Chemcial Industry and Engineering, 2007,V24(2): 121-124

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