Back to results
US 6,649,663 B1Granted
Process for preparing monodisperse ion exchangers having chelating functional groups and the use thereof
AssigneeBayer Aktiengesellschaft
InventorsReinhold Klipper, Werner Strüver, Ulrich Schnegg, Bruno Hees, Bernhard Lehmann, Holger Lütjens
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing novel, monodisperse ion exchangers having chelating functional groups, and their use for adsorbing metal compounds, in particular, heavy metal compounds and noble metal compounds, and also for extracting alkaline-earth metals from saline solutions from alkali metal chloride electrolysis.
Claims16
A process for preparing monodisperse ion exchangers having chelating functional groups comprising
- (a) reacting monomer droplets made from at least one monovinylaromatic compound and at least one polyvinylaromatic compound to give a monodisperse, crosslinked bead polymer,
- (b) amidomethylating the monodisperse, crosslinked bead polymer from step (a) with phthalimide or methylphthalimide,
- (c) converting the amidomethylated bead polymer from step (b) to an aminomethylated bead polymer, and
- (d) converting the aminomethylated bead polymer from step (c) to ion exchangers having chelating groups of the formula
- wherein
- R1 is hydrogen or a radical CH2—COOH or CH2 P(O)(OH)2,
- R2 is a radical CH2COOH or CH2P(O)(OH)2, and
- n is an integer from 1 to 4.
5 more elements
Dependencies are inferred from the claim text.