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US 10,294,313 B2Granted
Process for preparing aminomethylated bead polymers
AssigneeLANXESS Deutschland GmbH
InventorsReinhold Klipper, PIerre Vanhoorne
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Abstract
Aminomethylated bead polymers for use as ion exchangers, especially as anion exchangers, or for the preparation of chelate resins, are prepared in the presence of 1,3-dichloropropane as solvent and swelling agent.
Claims12
A process for preparing aminomethylated bead polymers, the process comprising:
- contacting monodisperse bead polymer comprising units based on styrene and divinylbenzene with:
- compounds of the formula (I) or salts thereof
- where R1=C1-C3-alkyl or H,
- compounds of the formula (II)
- where n=8 to 100,
- 1,3-dichloropropane, and
- sulfuric acid,
- wherein:
- about 7.5 to about 13 mol of the 1,3-dichloropropane is used per mole of the bead polymer;
- and
- about 3.5 to about 13 mol of the 1,3-dichloropropane is used per mole of the compounds of the formula (I);
- to produce phthalimidomethylated bead polymer;
- and
- hydrolysing the phthalimidomethylated bead polymer to produce aminomethylated bead polymer.
11 more elements
Dependencies are inferred from the claim text.