Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1998-01-22
1999-04-27
Nazario-Gonzalez, Porfirio
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C07F 1502
Patent
active
058980784
ABSTRACT:
A process for preparing a ferric chelate of an aminopolycarboxylic acid wherein an iron-containing material is reacted with an aminopolycarboxylic acid chelant in the presence of a base, which comprises employing reactants such that the molar ratio of chelant to iron is from about 0.8 to about 0.99, is disclosed. In preferred embodiments the chelate is a ferric ammonium ethylenediaminetetraacetic acid chelate. The inventive chelates show a reduced tendency to form a dark precipitate upon standing. This process is particularly suitable for use in preparing chelates for use in applications such as photographic bleaching. The corresponding ferric chelate composition and products prepared by the described process are also disclosed.
REFERENCES:
patent: 3767689 (1973-10-01), Donovan et al.
patent: 3867419 (1975-02-01), Iwano et al.
patent: 4364871 (1982-12-01), Svatek et al.
patent: 4438040 (1984-03-01), Svatek et al.
patent: 4558145 (1985-12-01), Smith et al.
patent: 5110965 (1992-05-01), Thunberg et al.
patent: 5717123 (1998-02-01), St. George et al.
patent: 5763634 (1998-06-01), St. George et al.
St. George George M.
Willis Stephen B.
Wilson David A.
Nazario-Gonzalez Porfirio
The Dow Chemical Company
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