Method for the production of melamine
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United States of America Patent
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-
Mar 22, 2005
Grant Date -
Mar 11, 2004
app pub date -
Sep 25, 2003
filing date -
Aug 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH.sub.3 to give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled to a temperature which is 1-50.degree. C., preferably 1-30.degree. C., above the melting point of the melamine, which is dependent on the prevailing NH.sub.3 pressure. Introduction of NH.sub.3 in countercurrent drives out the CO.sub.2 formed, after which the melamine melt is worked up in any appropriate way.
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