Process for making red phosphorus

Details Process for making red phosphorus Process for making red phosphorus

1980-02-20

1981-06-16

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Elemental phosphorus

423323, C01B 2501, C01B 2502, C01B 2504

Patent

active

042737524

ABSTRACT:
The invention relates to a process for making red phosphorus by subjecting molten yellow phosphorus to a thermal conversion reaction in a closed reaction zone. To this end, a hollow shaft-provided and closed ball mill is preheated to a reaction temperature within the range 280.degree. to 590.degree. C. Yellow phosphorus is continuously introduced into the ball mill through the hollow shaft in quantities per unit time which permit the reaction temperature prevailing inside the ball mill to be maintained without supply of heat from the outside. More particularly, decreasing quantities of yellow phosphorus are introduced per unit time at increasing temperature and increasing quantities of yellow phosphorus are introduced per unit time at decreasing temperature within the limits specified. Red phosphorus is allowed to cool inside the ball mill, water is poured over it and the whole is subjected to wet-grinding. An aqueous suspension of red phosphorus is finally removed from the ball mill.

REFERENCES:
patent: 3207583 (1965-09-01), Brautigam et al.

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