Method for increasing purity of melamine
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United States of America Patent
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May 7, 1996
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N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
Expired
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Abstract
A method of purifying melamine produced from urea in a high-pressure, non-catalytic, non-aqueous process is described. In the method impure melamine is heated to a temperature of from about 250.degree. to about 1000.degree. F. under a pressure from about 600 to 3000 psi in the presence of ammonia to provide melamine having a purity of 99.0% or above. The method is economical since chemical treatment and recrystallization steps are not required.
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