Red Phosphorus Powder
Red phosphorus powder is a kind of purple amorphous powder, shiny and non-toxic. When heated to 590 ℃ under high pressure, it begins to melt. If it is not pressurized, it will not melt and sublimate. After vaporization, it will condense to get white phosphorus.
Red phosphorus forms a high polymerization structure of chain or ring with the single bond of P4 tetrahedron, which has high stability, is insoluble in water and carbon disulfide, slightly soluble in absolute ethanol, and soluble in alkali liquor.
It reacts with nitric acid to produce phosphoric acid, which is heated in chlorine to produce chloride. Yellow phosphorus is heated to 250 ℃ under vacuum and normal pressure for several days, and gradually converts into red phosphorus.
| Item | Unit | Value |
| Molecular Formula | P4 | |
| Molecular Weight | 123.89 | |
| CAS No. | 7723-14-0 | |
| Content of Red Phosphorus | % | ≥98.5 |
| Content of Yellow Phosphorus | % | ≤0.005 |
| Appearance | Purplish red or brown powder | |
| Free acid | % | ≤0.5 |
| Content of water | % | ≤0.25 |
| Particle size | Mesh | 60 to 80 |
| Density | g/cm3 | 2.34 |
| Melting point | ℃ | 590 |
| Boiling point | ℃ | 280 |
- Odorless, non-toxic, insoluble in water and CO2.
- Slightly soluble in absolute ethanol and soluble in lye.
Red phosphorus can be used to prepare semiconductor compounds and as dopant of semiconductor materials. It can be used for flame retardant polyolefins, polystyrene, polyester, nylon, polycarbonate, polyformaldehyde, epoxy resin, unsaturated resin, rubber, textiles, etc. It can also be used as raw material for the production of organophosphorus pesticides, deacidification of light metals and pharmaceutical.
