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PRODUCTION OF BIODEGRADABLE CHELATING AGENT AS L,L-ETHYLENEDIAMINEDISUCCINC ACID AND ITS ALKALI METALLIC SALT THROUGH SCHIFF BASE OF GLYOXAL
PRODUCTION OF BIODEGRADABLE CHELATING AGENT AS L,L-ETHYLENEDIAMINEDISUCCINC ACID AND ITS ALKALI METALLIC SALT THROUGH SCHIFF BASE OF GLYOXAL
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机译：通过乙二醛的席夫夫碱制备生物可降解的螯合剂，如L，L-乙二胺二酸及其碱金属盐
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摘要
PURPOSE: To produce high-purity L,L-ethylenediaminedisuccinic acid (EDDS) excellent in biodegradability in high yield in a process good in reproducibility by using an industrially readily available glyoxal and L-aspartic acid as raw materials. ;CONSTITUTION: This method for producing an alkali metallic salt of L,L-EDDS is to condense one molecule of glyoxal with 2 molecules of L-aspartic acid under neutral to alkaline conditions, produce a Schiff base and then reduce the resultant Schiff base according to catalytic hydrogenation in the presence of a catalyst. Furthermore, the method for producing the L,L-EDDS is to similarly produce the Schiff base, subsequently reduce the Schiff base according to the catalytic hydrogenation, then deposit the resultant compound with a mineral acid and crystallize the compound or produce the Schiff base, then reduce the Schiff base with a metallic hydroxide and subsequently deposit the compound with the mineral acid and crystallize the compound.;COPYRIGHT: (C)1996,JPO
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