METHOD FOR PRODUCING AQUEOUS SOLUTION OF 1,3- PROPANEDIAMINE-N,N'-TETRAACETIC ACID FERRIC AMMONIUM COMPLEX

摘要

PROBLEM TO BE SOLVED: To easily produce the aqueous solution of PDTA ferric ammonium complex at a low cost. SOLUTION: This method for producing the aqueous solution of the 1,3- propanediamine-N,N'-tetraacetic acid ferric ammonium complex, characterized by heating Fe2O3 and metal iron (100: about 5 to 50 as Fe contents) together with the partially ammonium-neutralized product of 1,3-propanediamine-N,N'- tetraacetic acid in an aqueous medium at >=50 deg.C.