Patent ID: 7695707

Claim:
A method for the preparation of an iodizing agent that offers stability of iodine in formulation of iodised salt, the method comprising: (i) grinding pharma grade hydrotalcite to obtain hydrotalcite powder; (ii) calcining the hydrotalcite powder to obtain calcined hydrotalcite; (iii) cooling the calcined hydrotalcite to obtain solid synthetic hydrotalcite with an interlayer space within said solid synthetic hydrotalcite; (iv) heating an aqueous water soluble alkali metal salt solution; (v) adding calculated quantity of the solid synthetic hydrotalcite obtained in step (iii) into the water soluble alkali metal salt solution prepared in step (iv) under agitation for uniform dispersion to obtain a reaction mixture; (vi) maintaining the temperature of the reaction mixture in the range of 60 to 80° C. while stirring the reaction mixture to obtain a slurry comprising solid synthetic hydrotalcite and fluid water soluble alkali metal salt solution; (vii) aging the slurry for a period between 30 to 60 minutes and intermittently stirring for 1 minute at an interval of 30 minutes for effective contact and substitution of anions in the interlayer space; (viii) filtering the slurry to remove the fluid water soluble alkali metal salt solution to obtain a solid synthetic hydrotalcite cake, and washing the solid synthetic hydrotalcite cake so obtained with distilled water to remove adhering salts that formed during steps v, vi, viii; (ix) drying the solid synthetic hydrotalcite cake to get the iodizing agent.