Method for the preparation of melamine

Details Method for the preparation of melamine Method for the preparation of melamine

1980-05-02

1982-09-07

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D25160

Patent

active

043485200

ABSTRACT:
An improved method for the preparation of melamine by the conversion of urea and/or thermal decomposition products thereof. The urea and/or thermal decomposition products are converted to melamine in the presence of a gas mixture containing ammonia and carbon dioxide in a reaction zone containing a fluidized bed of catalytically active material. Melamine is desublimated from the melamine containing gas mixture in a desublimation zone by a dry-capture method leaving a desublimator off-gas mixture of ammonia, carbon dioxide and gaseous impurities. A major portion of this desublimator off-gas mixture is compressed and recirculated to the reaction zone as fluidizing gas for the bed of catalytically active material, without intervening treatment to remove gaseous impurities from the desublimator off-gas.

REFERENCES:
patent: 3700672 (1972-10-01), Kokubo et al.
patent: 3723430 (1973-03-01), Kokubo et al.
patent: 3895007 (1975-07-01), Schwarzmann et al.
patent: 4109090 (1978-08-01), van Hardeveld et al.
patent: 4156080 (1979-05-01), van Hardeveld
Schwarzmann, Hydrocarbon Processing, Sep. 1969, pp. 184-186.

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