STABILIZED POLYBROMIDE RESINS AND METHOD OF PREPARATION

摘要

A method of preparing a stabilized polybromide resin product for use in disinfecting potable water, in which water-containing porous beads of quaternary ammonium anion exchange resin are loaded with bromine. The beads are loaded in a bromine-containing water slurry, the loading providing the beads with excess bromine above the bromine content desired in the final product. The external water is removed from the loaded beads while leaving the beads in a moist sticky condition, the beads containing from 20 to 50% bromine based on the weight of the loaded beads. A moisture-evaporating carrier gas is passed through a mass of the moist beads at a controlled temperature and velocity effective to remove internal water gradually therefrom, the bromine content of the beads also being reduced as the internal water is removed. The gradual drying is continued until the beads are in an externally dry free-flowing condition containing less than 5% water by weight and from 17 to 47% bromine based on the final weight of the beads, whereby the resulting resin product provides increased bromine stability and more uniform bromine release.