phosphorus oxychloride (molecular formula: pocl3), also known as phosphorus chloride, phosphorus oxychloride, chlorine oxidation of phosphorus, is an industrial chemical raw materials, a colorless transparent liquid. with a pungent odor. intense fuming in moist air. the relative density of 1.67. melting point of 1.25 ℃. boiling point 105.1 ℃. decomposition of the formation of phosphoric acid in water, ethanol and hydrogen chloride. plenty of water is suddenly poured into the can react violently.