FIELD: chemical technology.
SUBSTANCE: invention describes a method for purifying melamine from impurities, such as ureidomelamine, oxotriazines by using melamimel. Method involves passing melamine melt through a catalyst layer at temperature from 340°C to 410°C and under pressure form 8 to 17 MPa to yield melamine showing the purity degree at least 99%. Catalyst is chosen preferably from aluminum oxide, silicon dioxide, mixture of aluminum oxide and silicon dioxide, molecular sieves and their mixture and melamine melt is passed through a layer of adsorbing material or catalyst in the presence of ammonia. Also, invention describes a device for continuous preparing melamine.
EFFECT: improved purifying and preparing melamine.
13 cl, 2 dwg, 4 ex
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