Method for preparation of amphoteric ion-exchangers by substitut

Details Method for preparation of amphoteric ion-exchangers by substitut Method for preparation of amphoteric ion-exchangers by substitut

1976-05-26

1978-01-10

Schofer, Joseph L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 22R, 526 16, 526 27, C08F 840, C08L 2332, C08L 2334, C08L 2336

Patent

active

040678253

ABSTRACT:
The invention relates to a method for preparation of cationactive and amphoteric ion-exchangers from non-ionogenic crosslinked copolymers containing hydroxyl groups by their reaction with mineral acids, addition products of sulfur trioxide, sulfuric acid or chlorosulfuric acid with alcohols or pyridine, unsaturated compounds, as acrylonitrile, methacrylonitrile or sodium vinylsulfonate in a strongly alkaline medium, or with halogenoalkylammonium compounds. The starting copolymer containing hydroxyl groups is prepared by the suspension copolymerization of monomers, selected from the group which comprises hydroxyalkyl methacrylates and acrylates and oligoglycol acrylates and methacrylates, with crosslinking divinyl monomers, e.g. divinylbenzene, ethylene dimethacrylate, butylenediol dimethacrylate or diacrylate, and advantageously has the macroporous structure. The products are suitable for application in column process thanks to their favorable mechanical properties, namely for chromatographic separation of hydrophilic compounds, e.g. biological materials as aminoacids. The hydrophilicity of the product may be varied by selection of monomers for the starting copolymer, by the type of ionactive substitution and by the degree of transformation.

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