calciumchloride

Calcium chloride is an inorganic compound with the chemical formula CaCl2. It appears as a white crystalline solid that is highly soluble in water and highly hygroscopic, readily absorbing moisture from the air. In practice it is encountered mainly as anhydrous calcium chloride or as hydrates, particularly the dihydrate CaCl2·2H2O.

Industrial production of calcium chloride typically involves reacting calcium compounds such as calcium carbonate or calcium hydroxide with hydrochloric acid to yield CaCl2 and water as a byproduct. It can also be obtained as a byproduct or recovered material from various chemical processes, including the chlor-alkali industry.

Physically, calcium chloride dissolves in water with the release of heat (the dissolution is exothermic). The resulting solution contains calcium ions (Ca2+) and chloride ions (Cl−). The compound is deliquescent and readily forms hydrates; the anhydrous form is very hygroscopic and tends to pick up moisture from the air.

Calcium chloride has a wide range of applications. It is widely used for de-icing roads and for dust control because it lowers the freezing point of water and absorbs moisture. In the food industry it serves as a firming agent, electrolyte supplement, and calcium fortificant in certain products (often designated as E509). It is also used in drilling fluids in oil and gas operations, in concrete as an accelerator to promote early strength development, and as a desiccant in moisture-absorbing products.

Safety and handling considerations include its corrosive nature and potential to irritate skin, eyes, and the respiratory system. Protective equipment should be used when handling concentrated materials, and spills should be managed to minimize environmental impact due to its hygroscopic and heat-generating properties.