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US 5,514,797 AGranted
Method for increasing purity of melamine
AssigneeMelamine Chemicals, Inc.
InventorsDavid Best, Amit Gupta
Life of this patent
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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.
Claims3
A method for purifying melamine comprising the steps of feeding impure melamine into a reactor;
- heating the melamine in the reactor to a temperature between about 250.degree. to about 1000.degree. F. under pressure of from about 600 to about 3000 psi while adding ammonia to said reactor and recovering melamine in purified form.
Dependencies are inferred from the claim text.