Process for the production of high purity melamine from urea

Details Process for the production of high purity melamine from urea Process for the production of high purity melamine from urea

2005-02-22

2005-02-22

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

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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