Process for making aminopolycarboxylic acid chelates of iron

Details Process for making aminopolycarboxylic acid chelates of iron Process for making aminopolycarboxylic acid chelates of iron

1980-09-08

1982-12-21

Warren, Charles F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 1502

Patent

active

043648711

ABSTRACT:
A process for making Fe-EDTA chelate comprising adding iron oxide at a ratio of <1 mole iron/mole EDTA to a mixture of NH.sub.4 OH and EDTA wherein NH.sub.3 /EDTA mole ratio is from 1 to not more than 1.5, heating until reaction is complete, cooling to about 60.degree. C. and adding sufficient NH.sub.3 to dissolve and maintain Fe-EDTA chelate in solution, cooling to room temperature and oxidizing Fe++ to Fe+++. The process provides (1) a minimum of foaming and sludge formation during the reaction, (2) rapid dissolution of iron oxide and (3) a chelate product substantially completely in the ferric state.

REFERENCES:
patent: 3050539 (1962-08-01), LeBlanc
patent: 3115511 (1963-12-01), Singer
patent: 3758540 (1973-09-01), Martell
patent: 3767689 (1973-10-01), Donovan
patent: 3867419 (1975-02-01), Iwano et al.

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