Method for the production of melamine

Details Method for the production of melamine Method for the production of melamine

2005-03-22

2005-03-22

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

C544S203000

Reexamination Certificate

active

06870050

ABSTRACT:
A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NH3to 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° C., preferably 1-30° C., above the melting point of the melamine, which is dependent on the prevailing NH3pressure. Introduction of NH3in countercurrent drives out the CO2formed, after which the melamine melt is worked up in any appropriate way.

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International Search Report of PCT/EP01/08648, dated Nov. 28, 2011.
International Preliminary Examination Report of PCT/EP01/08648, dated Feb. 22, 2002.

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