Process for the production of high purity melamine from urea

Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system

Reexamination Certificate

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C549S201000

Reexamination Certificate

active

06858730

ABSTRACT:
A method for purifying melamine comprising impurities like ureido-melamine, oxotriazines, melam, melem, comprises the step of putting into contact at a temperature comprised between 340° C. and 410° C. and at a pressure comprised between 8 and 17 MPa a melamine melt with a bed of a catalyst thus obtaininig melamine with a purity of at least 99%.

REFERENCES:
patent: 5514796 (1996-05-01), Best et al.
patent: 5721363 (1998-02-01), Canzi et al.
patent: 1174848 (1969-12-01), None

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