Iron selective resins prepared from a phenol, HCHO and a di-secondary amine
AssigneeCommonwealth Scientific and Industrial Research Organization
InventorJonathan H. Hodgkin
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Abstract
Ferric ions may be removed very selectively from aqueous solutions by means of a metal-chelating resin consisting of the acid-quaternized form of a cross-linked polymer produced by the condensation of a phenolic component comprising one or more phenols, formaldehyde, and a diamino component comprising one or more di-(secondary amino) compounds under neutral conditions. The resin is prepared by treating the cross-linked polymer with an aqueous solution of a strong mineral acid.
Claims14
A metal-chelating resin, selective for ferric ions and consisting of the acid-quaternized form of cross-linked polymer produced by the condensation of a phenolic component comprising one or more phenols, formaldehyde, and a diamino component consisting essentially of one or more di(secondary amino) compounds under neutral conditions.
A method for preparing an iron-selective metal-chelating resin which comprises treating a cross-linked polymer, with an aqueous solution of a strong mineral acid, said polymer having been prepared by condensing approximately equimolar quantities of a phenolic component comprising one or more phenols, and a diamino component consisting essentially of one or more di-(secondary amino) compounds with approximately twice the molar quantity of formaldehyde under Mannich reaction conditions.
Dependencies are inferred from the claim text.