Potassium Iodide Powder CAS 7681-11-0 KI

Potassium iodide Powder is a colorless cubic crystal, or granules or powder, which is slightly deliquescent in moisture. The relative density is 3.13, the melting point is 723°C, the boiling point is 1330°C, and the solubility to water is 127.5g/100g (0°C), 208g/100g (100°C), and it is very easy to dissolve. The solubility in ethanol is 4g/100g (20°C), and it is 16.5g/100g (20°C) in methanol, and it is hardly soluble in ether. 

Since KI water solution is easy to dissolve iodine, it is used when preparing concentrated iodine solution. The solid extracted from the solution is potassium triiodide (KI3). It is a co-solvent for iodine and some insoluble metal iodides. It is also used as a photographic emulsifier. It is used as an expectorant, diuretic in medicine, as a preventive agent for goiter, and as a preoperative medication for hyperthyroidism. It has a broader market prospect than potassium iodate for the manufacture of rheumatism analgesic ointment with analgesic and blood-activating effects.

Potassium iodide Powder is used as an iodine supplement. Its dosage forms include tablets, mixtures and oral liquids. It is mainly used clinically for the prevention and treatment of simple goiter, thyroid crisis, and preoperative preparation for hyperthyroidism. In recent years, the clinical application of potassium iodide has continued to expand, and it has been widely used in the treatment of diseases such as dermatology, ophthalmology, joint inflammation, lead nephropathy and breast hyperplasia, and has achieved satisfactory results. Since potassium and sodium are in the same main family and have very similar properties, it is difficult to separate the impurity sodium ions in potassium iodide. The traditional purification method of potassium iodide is to recrystallize it repeatedly with water to achieve the purpose of purification. Both potassium iodide and sodium iodide have high solubility in water, so the method of recrystallization from water to purify potassium iodide has a low yield, about 80%, and the effect of removing sodium is not ideal.