Method for purifying a melamine melt

Details Method for purifying a melamine melt Method for purifying a melamine melt

2006-05-09

2006-05-09

Balasubramanian, Venkataraman (Department: 1624)

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C544S201000

Reexamination Certificate

active

07041822

ABSTRACT:
The invention relates to a method for producing pure melamine in a high-pressure method. According to said method, in the first stage, the melamine melt is brought into contact with hot NH3and NH3from the second stage and in the second step is brought into contact with cold NH3in such a way that it is cooled to a temperature, which is 1–30° C. above the pressure-dependent melting point of the melamine, before being optionally rested in a third stage and subsequently treated in various ways.

REFERENCES:
patent: 3116294 (1963-12-01), Marullo et al.
patent: 3207744 (1965-09-01), O'Hara et al.
patent: 6258950 (2001-07-01), van Wijck et al.
patent: WO 00/21940 (2000-04-01), None

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