Process to prepare phenolic ethylenediamine diacetic acid compounds
AssigneeAkzo Nobel Chemicals International B.V.
InventorsAdrianus Maria Reichwein, Hubertus Johannes Jongen, Marjolein Groote
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Abstract
The present invention relates to a process to prepare N,N′-di(2-hydroxybenzyl) ethylenediamine-N,N′-diacetic acid and salts thereof comprising a reaction between formaldehyde, ethylenediamine diacetic acid or a salt thereof and phenol at a pH of between 3 and 7 and a temperature below 60° C. wherein the reaction mixture contains 0.2 to 1.1 molar equivalents of alkali metalions on the molar amount of EDDA.
Claims14
Process to prepare N,N′-di(2-hydroxybenzyl) ethylenediamine-N,N′-diacetic acid (HBED) and salts thereof comprising a reaction between formaldehyde, ethylenediamine diacetic acid or a salt thereof (EDDA) and phenol at a pH of between 3 and 7 and a temperature below 60° C., wherein the reaction mixture contains 0.2 to 1.1 molar equivalents of alkali metal ions on the molar amount of EDDA.
Dependencies are inferred from the claim text.