There are many production methods of caustic soda, among which the ion-exchange membrane method is the most advanced production method of caustic soda, and it has been adopted by many chlor-alkali manufacturers at home and abroad. However, the ion-exchange membrane method has high requirements on the quality of the brine of the electrolyzed raw material. The brine often contains iodide into the production process, and is oxidized to iodate during the electrolysis process. Once it enters the alkaline environment of the ion-exchange membrane, it can be oxidized to periodic acid. Salt, and the formation of poorly soluble precipitates, resulting in reduced current efficiency and shortened ion membrane life.
Ion exchange resin method for removing iodine, compared with air blasting method, adsorption method and other iodine purification schemes, has good selectivity, low energy consumption, and is more suitable for brine purification of iodine, which is an ideal method.