Product Name：Phosphorus pentachloride
In solid state, the structural unit of phosphorus pentachloride-6 - can be written as PCI4+ and PCI6-, and cesium chloride crystal structure. The two ions are tetrahedral and octahedral respectively, and the phosphorus atom in the cation is sp3 hybrid, and the phosphorus atom in the anion is SPD hybrid. The gaseous and liquid phosphorus penoxide has a monomolecular structure, and the molecular star triangle is biconical, which is consistent with the prediction of VSEPR theory.
Chemical formula: PCL5
Molecular weight: 208.23
Melting point: 148 (pressurized)
Boiling point: sublimation (normal pressure); 160 (pressurized)
CAS no. : 10026-13-8
Relative density (water =1) : 3.60
Appearance and shape: white or yellowish crystal, irritating gas, easy to sublimate.
Physical and chemical properties
White to pale yellow crystals. A pungent unpleasant smell. Smoke. Easy deliquescence. At about 100 sublimations, do not melt. Hydrolyze with water to form phosphoric acid and hydrogen chloride. In the presence of alcohols, corresponding chlorides are formed. Soluble in carbon disulfide and carbon tetroxide. Low toxicity. Corrosive.
Hydrochloric acid and phosphoric acid can be hydrolyzed by water: PCI5+4H2O=5HCl+H3PO4 in liquid ammonia: PCI5+9NH3==P(NH)(NH2)3+5NH4CI When oxygen is insufficient, the formation of phosphorus trichloride (white fog), phosphorus trioxide can continue to react with chlorine gas to form phosphorus pentachloride.
A catalyst for the manufacture of acetyl cellulose and the determination of hydroxyl methylene by the conversion of hydroxyl groups in compounds, especially isoacids, to acyl chlorine. Used as chlorination agent, catalyst, also used in pharmaceutical. Used as chlorination agent and catalyst in organic synthesis. Is the production of medicine, dyes, chemical fiber raw materials, but also the production of phosphorus nitrile, phosphoryl chloride raw materials. Used as chlorination agent and catalyst in organic synthesis. Is the production of medicine, dyes, chemical fiber raw materials, but also the production of phosphorus nitrile, phosphoryl chloride raw materials. Phosphorus pentoxide is mainly used as chlorination reagent for alcohols, carboxylic acids, amides, aldehydes, enols and Beckmann reagents. The converted alcohols and phenols are converted into chlorides. Phosphorus pentachloride can substitute alcohols and phenols (ROH/ArOH) chlorides into chlorides.
Toxicity and protection
It can be decomposed into phosphorus oxychloride, phosphoric acid and hydrochloric acid by water in eyes and respiratory tract. Phosphorus pentachloride steam and smoke to the respiratory tract, eyes, oral mucosa has a very strong stimulation, follow-up sessions can cause burning pain, or difficulty swallowing, severe cases can be caused by laryngeal edema, suffocation, and may cause bronchitis, chemical pneumonia, pulmonary edema, chest can smell of dry and wet rale, this effect is similar to phosgene (COCI2), toxicity than phosphorus trichloride. Respiratory protection: when the concentration of air exceeds the limit, one must wear gas mask or air supply helmet. When emergency rescue or escape, it is recommended to wear self-contained breathing apparatus.
Packaging storage and transportation
Ventilation and low-temperature drying in storeroom; Store separately with alkali, oxidant, organic matter and inflammable.
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