Production of red phosphorus

Details Production of red phosphorus Production of red phosphorus

1978-01-25

1979-05-01

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Elemental phosphorus

C01B 25023

Patent

active

041524039

ABSTRACT:
Red phosphorus, usually in amorphous form, is obtained by heating liquid white phosphorus at a temperature of between 250.degree. and 590.degree. C. while the phosphorus is subjected to a pressure greater than the theoretical vapor pressure of white phosphorus at the heating temperature. The application of such pressure minimizes phosphorus vapor formation during the conversion to red phosphorus. The process may be carried out by feeding liquid white phosphorus into an extrusion head heated to the reaction temperature while subjecting the white phosphorus to the appropriate pressure in the extrusion head, the red phosphorus being extruded from the extrusion head into an inert atmosphere. Alternatively, molten white phosphorus in droplet form may be pumped into an inert immiscible heat exchange fluid, such as, lead, at the reaction temperature, the appropriate pressure applied in the fluid and particulate red phosphorus separated from the fluid.

REFERENCES:
patent: 804555 (1905-11-01), Schenck et al.
patent: 2397951 (1946-04-01), DeWitt
patent: 2476335 (1949-07-01), Tusson
patent: 3056660 (1962-10-01), Williams
patent: 3207583 (1965-09-01), Brautigam et al.
patent: 3840623 (1974-10-01), Olsson et al.
patent: 3998931 (1976-12-01), Hyman et al.
VanWazer, Phosphorus and Its Compounds, 1958, pp. 101, 102, 112-118.
Kirk-Othmer, Encyclopedia of Chem. Tech., 1969, pp. 276-286.

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