METHOD FOR PRODUCING MIXTURE OF CHELATING AGENTS Russian patent published in 2015 - IPC C07C227/06 C07C227/10 C07C227/16 C07C229/24 

FIELD: chemistry.

SUBSTANCE: invention refers to a method for producing a mixture of aspartic acid diethoxysuccinate and an amino acid derivative of general formula , which can find application as a chelating agent. In formula I, n is equal to 1-10, m is equal to 0 or 1, whereas R represents a hydrogen atom or an alkali or alkali earth metal ion. The method involves carrying out a reaction of maleate and diethanolamine in the alkali medium in the presence of a lanthanide catalyst element to form aspartic acid diethoxysuccinate. That is followed by adding aspartic acid, which reacts with unreacted maleate to form iminodisuccinic acid, i.e. an amino acid derivative of formula I, wherein m is equal to 0, or adding a diamine derivative of general formula NH₂(CH₂)_nNH₂ II, wherein n is such as described above, which reacts to unreacted maleate to form the amino acid derivative of formula I, wherein m is equal to 1, whereas n is such as specified above.

EFFECT: method enables producing the mixtures of chelating agents with the use of unreacted maleate from the process of producing aspartic acid diethoxysuccinate that makes the presented method more cost-efficient.

11 cl, 2 tbl, 2 ex