FIELD: industrial organic synthesis. SUBSTANCE: melam and ureidomelamine-polluted solid melamine is hold in ammonia atmosphere at pressure 5 to 350 bar within a temperature range between 200 C and below melting point of melamine (depending on ammonia pressure utilized) over a time interval going from 1 min to 20 h, after which product is cooled to ambient temperature and decompressed. Purified melamine is obtained in powdered form. EFFECT: increased purification efficiency. 4 cl, 2 tbl, 26 ex
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