Patent ID: 8440730
Filing Date: 2013-05-14
Classification: B01J,C02F,C08F,C25B

Abstract:
1. A method for producing monodisperse ion exchangers having chelating functional groups represented by the structural formula (I) where is the polymer backbone and R 1 and R 2 independently of one another are hydrogen or a group with a degree of substitution in the range of 1.4-1.99 (including end values), comprising the steps of: a) forming monodisperse crosslinked polymer beads via reacting monomer droplets of at least one monovinylaromatic compound, at least one polyvinylaromatic compound, at least one porogen, and at least one initiator or an initiator combination, wherein a jetting process and/or a seed-feed process is employed, b) phthalimidomethylating the monodisperse crosslinked polymer beads with phthalimide derivatives present in inert solvent and comprising an SO c) converting the phthalimidomethylated polymer beads to aminomethylated polymer beads, and d) reacting the aminomethylated polymer beads to introduce chelating groups, thereby forming said monodisperse ion exchangers having chelating functional groups represented by the structural formula (I).