Abstract
Abstract Cryptomelane-type hydrous manganese dioxide (CRYMO) has a high adsorption selectivity toward potassium ions (K+). The distribution coefficients of the highly selective adsorption are evaluated by the theoretically proven calculation method, that adsorption isotherm data and Kielland plot data are taken for granted. The calculated results and the experimental results of the adsorption isotherm show fairly good agreement for a whole range of conditions. CRYMO has been successfully applied to the caustic soda manufacturing process. The concentration of K+ in brine for the process was lowered to less than 1 ppb. This purity is sufficient for the high quality caustic soda manufacturing process. Another advantage of CRYMO is its acidification ability for solutions. The brine is acidified with hydrochloric acid before being introduced to the electrolytic bath in the present process.
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