Patent ID: 8636893

Claim:
A method of producing chlorine with a reduced bromine content from brine containing some amount of bromine compounds, which comprises: (a) electrolyzing the brine to produce gaseous chlorine, alkali metal hydroxide, hydrogen and a depleted brine, (b) directing the depleted brine to a primary dechlorination step using hydrochloric acid to remove gaseous chlorine therefrom, (c) optionally directing the depleted brine from the primary dechlorination step to a secondary dechlorination step using a reducing agent for chlorine and oxychlorine species, and (d) recycling the dechlorinated depleted brine to salt dissolvers to prepare brine for electrolysis; wherein at least part of the gaseous chlorine generated in step (b) is not combined with the gaseous chlorine generated in step (a).