High pressure method for producing pure melamine in a vertical synthesis reactor
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United States of America Patent
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May 20, 2008
Grant Date -
Oct 4, 2007
app pub date -
Jul 27, 2005
filing date -
Jul 29, 2004
priority date (Note) -
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Abstract
The invention relates to a high pressure method for producing pure melamine by pyrolyzing urea in a vertical synthesis reactor. The synthesis reactor has three stages above one another: a) in the first stage, the smaller portion of the total amount of urea is introduced into the central tube of a first tank reactor forming a first melamine-containing reaction medium; b) in the second stage, the first melamine-containing reaction medium and the larger portion of the total amount of urea is introduced into the central tube of a second tank reactor forming a second melamine-containing reaction medium; c) in the third stage, the second melamine-containing reaction medium is introduced into a vertical tubular flow reactor forming a raw melamine melt that is processed to obtain pure melamine.
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