Patent ID: 7195740

Claim:
A reactor for removing alkali hydroxide and hydrogen peroxide contaminants from an aqueous alkali halide stream, comprising a reactor vessel; an alkali hydroxide inlet in the upper region of the vessel in fluid communication with an alkali hydroxide source from which a stream of alkali hydroxide is introduced into said upper region; a contaminated alkali halide inlet in the upper region of the vessel in fluid communication with a contaminated alkali halide source from which a stream of contaminated alkali halide is introduced into said upper region; a chlorine gas inlet in the lower region of the vessel in fluid communication with a chlorine gas source from which a stream of chlorine gas is introduced into said lower region, said stream of chlorine gas flowing counter-current to said alkali hydroxide and contaminated alkali halide streams so that said streams react of produce a stream of treated alkali halide; and a treated alkali halide outlet in the lower region of the vessel through which said stream of treated alkali halide exits said vessel.