Phosphorus Pentoxide

IdentificationSynonyms: diphosphorus pentaoxide; phosphoric anhydride; phosphoric pentoxide; Phosphorus oxide; Phosphorous pentaoxide; Phosphorous Anhydride; P2O5De: Diphosphorpentaoxid Es: Pentaóxido de difosforo Fr: Pentaoxyde de diphosphoreCAS No.: 1314-56-3 EC #: 215-236-1 RTECS: TH3945000CAS No.: 16752-30-6 (for P4O10)Molecular Weight:141.9446Molecular Formula: O5P2m.p.: 340 °Cb.p.: 360°C (sublimes)Structural Formula:Appearance: white power, very deliquescent, with pungent odorPreparationPhosphorus pentoxide is prepared by burning elemental phosphorus P4 (yellow phosphorus) with sufficient supply of dry air: P4 + 5 O2 → P4O10 in furnaceApplication1) Phosphorus pentoxide is a raw material to make phosphoric acidP4O10 + 6 H2O → 4 H3PO42) To make phosphorus oxychloride: 6PCl5 + P4O10 → 10POCl3(although 2PCl3+O2→2POCl3 is mostly applied on industrial scale)3) To make metaphosphoric acid and polyphosphoric acid.4) Phosphorus pentoxide is also applied as dehydrating agent, desiccant, antistatic agent, etc. See the following reaction:P4O10 + RCO2H → P4O9(OH)2 + [RC(O)]2OThe desiccating power of P4O10 is strong enough to convert many mineral acids to their anhydrides, e.g: HNO3→N2O5; H2SO4→SO3; HClO4→Cl2O7.5) Used as "Onodera reagent", a solution of P4O10 in DMSO, is employed for the oxidation of alcohols. This reaction is reminiscent of the Swern oxidation.SpecificationItemsSpecificationPhosphorus Pentoxide purity99.0% min.Insolubles in water0.02% max.Iron0.002% max.Heavy metals as Pb0.01% max.Arsenic0.01% max.NH40.01% maxReducing substance (P2O3)0.02% max.Appearancewhite powderStandard Packaging25, 50, 200kg/drum, 16000kgs/20’FCLFiber drum, woven bag, supper sack are also availableRisks and Safety InfoDangerous, corrosive, very deliquescent, reacts vigorously with water, or water-contained substance, alkali, metalsUN 1807Class 8PG IIR-Phrase: R35S-Phrase: S1/2, S22, S26, S45For more details, please see MSDS.