Phosphorus oxychloride is an inorganic compound with the chemical formula POCl3. It is a colorless transparent liquid, primarily used in the production of pharmaceuticals, synthetic dyes, and plastics.

Also known as phosphorus oxychloride, phosphoryl chloride

Chemical formula POCl3

Molecular weight 153.332 [2]

CAS registry number 10025-87-3 [2]

Melting point 1.25 °C [2]

Boiling point 105.3 °C [3]

Density 1.675 g/cm3

Appearance Colorless transparent liquid

Used in the production of phosphates such as diphenyl isooctyl phosphate and triethyl phosphate, plastic plasticizers, organophosphorus pesticides, long-acting sulfonamide drugs, etc. It can also be used as a dye intermediate, chlorinating agent and catalyst in organic synthesis, flame retardant. Electronic-grade phosphorus oxychloride is used in the solar industry, integrated circuits, discrete devices, optical fiber preforms, and as a liquid phosphorus source for the preparation of phosphates.

agents, as well as medical supplies.