Production of red phosphorus

Details Production of red phosphorus Production of red phosphorus

C - Chemistry, Metallurgy

01

B

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C01B 25/023 (2006.01)

Patent

CA 1091896

PRODUCTION OF RED PHOSPHORUS ABSTRACT OF THE DISCLOSURE Red phosphorus, usually in amorphous form, is obtained by heating white phosphorus at a temperature of between 250° and 590°C while the phosphorus is subjected to a pressure greater than the vapor pressure of white phosphorus at the heating temperature. In this way, formation of a phosphorus vapor phase during the conversion is avoided. This may be achieved by feeding liquid white phosphorus into an extrusion head heated to the reaction temperature while sub- jecting the white phosphorus to a pressure in the extrusion head, the red phosphorus being removed into an inert atoms- phere. Alternatively, molten white phosphorus in droplet form may be pumped into an inert immiscible heat exchange fluid at the reaction temperature and particulate red phosphorus separated from the fluid. - 1 -

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