A PROCESS FOR THE PREPARATION OF PURE POTASSIUM IODATE SOLUTION FROM IODINE AND POTASSIUM HYDROXIDE FOR SALT IODIZATION

摘要

A process for the in-situ preparation of a solution of pure potassium iodate solution for the use in the manufacture of iodized salt from iodine with 100% current efficiency is described. This process is carried out in a two-compartment anion exchange membrane flow cell by allowing a solution of 1.75% (w/v) iodine in 1.25% (w/v) potassium hydroxide through anode and 2-6%(w/v) of potassium hydroxide or sodium hydroxide through cathode compartments at 25-50 ml/min under gravity. An expanded precious metal oxide coated titanium as anode and an expanded thin stainless steel sheet as cathode are used. The current is varied across the electrodes between 30-60 A against 3 - 5 V at 30-40 °C. 16