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AssigneeAmi Agrolinz Melamine International GmbH
InventorsFrank Schröder, Wolfgang Ruech, Christoph Neumüller, Ferdinand Koglgruber, Hans Christian Wagner
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The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an aqueous solution containing alkalis, following the isolation of the off-gases, and is directly transferred into an aqueous alkaline melamine solution, out of which the melamine is then crystallized. The invention thus enables melamine to be obtained, with a melam content of less than 1000 ppm and a melem content of less than 50 ppm. The invention also relates to a quenching agent.
A process for preparing solid melem-free melamine by aqueous work-up of a melamine melt obtained from a high-pressure process, characterized in that the melamine melt is provided at a temperature between 330 and 400° C. and a pressure between 50 and 600 bar, the process comprising:
Dependencies are inferred from the claim text.