Treatment of chlorine dioxide generator effluent and feed streams with fixed-resin bed

Abstract From the Canadian patent

A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition sulfuric acid is , purified providing an opportunity for reuse in various mill applications and/or concentrated and recycled to the generator. Alternatively to avoid , high evaporation costs, the purified acid can be used to regenerate a …