Process for preparing potassium iron(iii) ethylenediaminetetraacetic acid complex salt
AssigneeBASF SE
InventorsFrank BACHMANN, Doris KREMZOW-GRAW, Paul KLINGELHOEFER, Imme WITTE, Peter OECHSLE, Sarah Veronika ILLIES
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Abstract
Disclosed herein is a process for preparing the potassium salt of iron(III) ethylenediaminetetraacetic acid complex (KFe(III)EDTA) by partially neutralizing the acid form of EDTA with a basic potassium salt, reacting the partially neutralized EDTA with a Fe3O4 source to a potassium iron ethylenediaminetetraacetic acid complex salt containing both iron (II) and (III), oxidizing the iron(II) contained therein with an oxygen-based oxidation agent, and adjusting the pH to from 5 to 7 with a basic potassium salt.
Claims20
A process for preparing potassium iron(III) ethylenediaminetetraacetic acid complex salt KFe(III)EDTA, comprising
- (i) reacting in an aqueous medium the acid form of ethylenediaminetetraacetic acid with a basic potassium salt to a partially neutralized ethylenediaminetetraacetic acid;
- (ii) reacting the reaction mixture obtained in step (i) with a Fe3O4 source to a potassium iron ethylenediaminetetraacetic acid complex salt containing both iron (II) and (III);
- (iii) oxidizing the potassium iron ethylenediaminetetraacetic acid complex salt containing both iron (II) and (III) to potassium iron(III) ethylenediaminetetraacetic acid complex salt with an oxygen-based oxidation agent;
- and
- (iv) adjusting the reaction mixture obtained step (iii) to a pH of from 5 to 7 with a basic potassium salt.
Dependencies are inferred from the claim text.