Potassium iodide, POTASSIUM IODINE, Potassium iodide white powder, 7681-11-0

Potassium iodide, POTASSIUM IODINE, Potassium iodide white powder, 7681-11-0

Potassium iodide

CAS: 7681-11-0

Molecular Formula: KI

Names and Identifiers

Physico-chemical Properties

Risk and Safety

Hazard Symbols	C - Corrosive
Safety Description	S24/25 - Avoid contact with skin and eyes.

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Nature

colorless or white cubic crystals. Odorless, with a strong bitter and salty taste. Relative density 3. 12. Melting point 680 °c. Boiling point 1420 °c. Deliquescence in moist air. In light and air can precipitate free iodine and yellow, more likely to yellow in acidic aqueous solution. Soluble in water, dissolved when significantly absorb heat, soluble in ethanol, acetone, methanol, glycerol and hydrogen, slightly soluble in ether. Potassium iodide aqueous solution is neutral or slightly alkaline.

Preparation Method

formic acid reduction method: a technical grade iodine tablet is added to a reactor with stirring, water is added, and a potassium hydroxide solution having a relative density of about 1.3 is slowly added with stirring to complete the reaction. The reaction solution was purple-brown in color. When the pH value was 5~6, some potassium iodate crystals appeared in the container. The potassium iodate was reduced by slow addition of formic acid to the solution. The solution after the reduction of formic acid is added with caustic potash, and the pH value is adjusted to 9 to 10. The steam is introduced and kept for 1-2H. The mixture was allowed to stand and insoluble matter was removed by filtration to obtain a clear filtrate, which was concentrated by evaporation until most of the crystals were precipitated. The crystals were cooled, crystallized and centrifuged, and dried at 110 ° C. To obtain a finished potassium iodide product.

Introduction

Slightly deliquescent. If the iodine is separated for a long time or when the light is precipitated, it will turn yellow. Save against moisture and light. Its aqueous solution is neutral or slightly alkaline and can dissolve iodine. Approximate lethal dose (rat, vein) 285mg/kg.

Use

potassium iodide is often used as a corrosion inhibitor for steel pickling or as a synergist for other corrosion inhibitors. Potassium iodide is the raw material for the preparation of each iodide and dye. Used as photographic emulsifier, food additives, used in medicine as expectorants, diuretics, prevention and treatment of goiter and hyperthyroidism before surgery with drugs, also used as analytical reagents.

Safety

The product was packed in brown ground glass bottles and sealed with wax. Each bottle had a net weight of 0.5kg and 1kg. Transport in a box containing 10 bottles per box. Or packed in an iron drum lined with a plastic bag with a net weight of 50kg per barrel. Packaging operations should be performed in a dark room or under red light. Should be stored in a cool, dark, dry warehouse. The mouth must be sealed. Co-storage and co-transportation with drugs are not allowed. Protection against rain and sun exposure during transport. During loading and unloading, care should be taken. Vibration and impact are strictly prohibited to prevent package breakage. Fire, water, sand and all kinds of fire extinguishing. Toxicity and protection see iodine.