Apparatus for making red phosphorus

Details Apparatus for making red phosphorus Apparatus for making red phosphorus

1981-01-19

1982-05-18

Chiesa, Richard L.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including heat exchanger for reaction chamber or reactants...

422204, 422209, 423322, C01B 25023

Patent

active

043305040

ABSTRACT:
The invention relates to an apparatus 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 phosphorous 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: 1719038 (1929-07-01), Wood
patent: 2987381 (1961-06-01), Carter et al.
patent: 3111394 (1963-11-01), Weber et al.
patent: 3188171 (1965-06-01), Ghyssaert
patent: 3207583 (1965-09-01), Brautigam et al.
patent: 3495951 (1970-02-01), Tanaka et al.
patent: 4050897 (1977-09-01), Klein
patent: 4188367 (1980-02-01), McGilvery

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