| abstract |
PURPOSE: To refine the title aqueous solution to high purity, by providing dimethylhydroxyethyl-benzylammonium to a free base type weak basic ion exchange resin. n CONSTITUTION: A layer comprising a free base type weak basic anion exchange resin, to which 5W50vol% of dimethylhydroxyethyl-benzylammonium is provided as an ion exchange group, is formed as an upper layer part and a layer comprising a hydroxyl type strong basic anion exchange resin having a porous resin matrix structure is formed as a lower layer part to form a resin bed. Subsequently, an aqueous non-electrolytic org. substance solution after cation removing treatment is passed through said resin bed. n COPYRIGHT: (C)1985,JPO&Japio |