Melamine of improved purity produced by high-pressure, non-catalytic process
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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
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Expired
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Abstract
A high-pressure, non-catalytic process for producing melamine from urea wherein the melamine is recovered directly as a dry powder without washing or recrystallization is described. In the process, liquid melamine is fed to a cooling unit where it is quenched with a liquid medium, preferably liquid ammonia. By increasing the pressure within the cooling unit to a pressure in excess of 600 psi and preferably to 1200 to 1400 psi provides melamine having a purity in excess of 99%.
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