METHOD FOR PREPARING POTASSIUM IODATE AND POTASSIUM IODIDE Russian patent published in 2007 - IPC C01B9/06 C01B9/00 C01D3/12 

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing potassium iodate and potassium iodide. Potassium hydroxide, iodine and water are added to reactor, reaction mixture is stirred and formed suspension of crude iodate with admixture of potassium iodide in potassium iodide solution with admixture of potassium iodate is cooled. Crude iodate precipitate is separated and purified. The main part of potassium iodate in potassium iodide solution is reduced with formic acid to potassium iodide and residual amount of potassium iodate and iodine is reduced additionally in potassium iodide solution. Purification of crude potassium iodate from admixture of potassium iodide is carried out by electrochemical oxidation and addition reduction of potassium iodate and iodine is carried out with a measured amount of hydrazine hydrate. If necessary, equivalent amount of iodine and hydrazine hydrate are added for decreasing the alkalinity index of solution. Invention provides simplifying technology in preparing potassium iodate, simplifying technology and enhancing effectiveness in preparing potassium iodide, increased output of used equipment and reducing energy consumption. Potassium iodide and potassium iodate are used in pharmaceutical industry as components of medicinal agents, in food processing industry, in producing photographic materials and reagents and for other aims.

EFFECT: improved method for preparing.

3 ex