Melamine purification process
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United States of America Patent
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Aug 10, 2004
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N/A
app pub date -
Oct 17, 2002
filing date -
Nov 16, 1999
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Abstract
A process for the purification of melamine, deriving from urea, according to a high pressure non catalytic process, by means of polycondensates and other by-products transformation, which by-products derive from the melamine synthesis comprosing the following steps: dissolving in water the raw liquid melamine containing polycondensates and other melamine synthesis by-products, subjecting such solution to a treatment capable to remove dissolved CO.sub.2 limiting its concentration to a value lower than 0.5 wt. %, submitting raw melamine solution, to the action of ammonia, in an amount of 5 to 25 wt. %, at a temperature of 100 to 250.degree. C. and leaving the mixture to react for some minutes, recoving a solution having polycondensates concentration lower than 1000 ppm, typically less than 100 ppm.
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