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US 8,506,818 B2Granted
Method for producing chelate resins
AssigneeLANXESS Deutschland GmbH
InventorsReinhold Klipper, Michael Schelhaas
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Abstract
The present invention relates to a method of producing novel chelate resins based on crosslinked polymer beads starting with methacrylic compounds, containing aminomethyl groups and/or aminomethyl nitrogen heterocyclic groups as functional groups, that have a high uptake capacity for heavy metals and rapid kinetics.
Claims8
A method of producing a chelate exchanger containing aminomethyl nitrogen heterocyclic groups, comprising:
- a) polymerizing monomer droplets of (i) at least one (meth)acrylic compound, (ii) at least one polyvinylaromatic compound, and (iii) one multifunctional ethylenically unsaturated compound in the presence of an initiator, thereby forming crosslinked polymer beads,
- b) reacting the crosslinked polymer beads with at least one liquid diamine, thereby forming animated polymer beads;
- and
- c) further reacting, at a pH which is maintained in the range of 6 to 9, the aminated polymer beads with halomethyl nitrogen heterocycles thereby forming the chelate exchanger.
1 more element
Dependencies are inferred from the claim text.