The Dow Chemical Company

Edward R Husser

George R Killat

Charles F Raley, Jr

A process for the preparation of chelation resins is disclosed. By this process, chelation resins can be prepared without the formation of large amounts of waste salt streams. In addition, novel chelation resins are prepared according to this process.

Process for the preparation of chelation resins

High density, ion exchange resins having excellent integrity are prepared from cross-linked, aromatic polymers which have been halogenated in the presence of an organic liquid having a sufficiently high dielectric constant to prevent substantial halogenation of the polymer backbone such as various organic nucleophiles having a free electron pair associated with a nonhalogen atom, e.g., ethanol or dimethylformamide. For example, a cross-linked polystyrene which has been brominated in methylene chloride containing a small amount of ethanol can subsequently be chloromethylated and aminated to form a high density anion exchange resin useful in removing anions from thick slurries such as those employed in uranium recovery.

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Midland, MI, United States of America

Edward R Husser