Continuous synthesis of chromium dioxide

Details Continuous synthesis of chromium dioxide Continuous synthesis of chromium dioxide

1982-01-18

1984-01-31

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6251, 422232, 423607, C01G 37027

Patent

active

044288522

ABSTRACT:
Ferromagnetic chromium dioxide is produced in a continuous operation by feeding a preheated paste of hydrated chromium oxides and additives into a twin screw reactor, reacting at elevated temperature and pressure for a short time while venting oxygen and steam, injecting water near the end of the reaction zone to form a viscous chromium dioxide-water mixture, and cooling while passing through a pressure letdown extruder.

REFERENCES:
patent: 1379187 (1921-05-01), Kaufman
patent: 2021991 (1935-11-01), Depew
patent: 3010802 (1961-11-01), Schenk
patent: 3111394 (1963-11-01), Weber et al.
patent: 3278263 (1966-10-01), Cox
patent: 3991153 (1976-11-01), Klausner et al.
patent: 4045544 (1977-08-01), Williston et al.

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