Preparation of ferric aminopolycarboxylate solutions having...

Details Preparation of ferric aminopolycarboxylate solutions having... Preparation of ferric aminopolycarboxylate solutions having...

C - Chemistry, Metallurgy

07

C

C07C 229/76 (2006.01) C07C 227/18 (2006.01) C07F 15/02 (2006.01)

Patent

CA 2312959

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 0.8 to 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.

La présente invention concerne un procédé de préparation d'un complexe ferrique d'acide aminocarboxylique dans lequel on fait réagir une substance contenant du fer avec un acide aminopolycarboxylique complexant en présence d'une base, comprenant l'utilisation de réactifs tel que le rapport molaire entre le complexant et le fer est compris entre 0.8 et 0.99. Dans des modes de réalisation préférés le complexe est un complexe d'acide ethylenediaminetetraacetique d'ammonium ferrique. Le complexe selon l'invention présente une tendance réduite à former un précipité noir au repos. Ce procédé est notamment utile pour la préparation de complexes destinés à être utilisés dans des applications tel que le blanchiment en photographie. L'invention concerne aussi la composition de complexe ferrique correspondante et les produits préparés selon le procédé décrit.

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