Method for contacting molten urea with a gas stream
AssigneeDsm IP Assets B.V.
InventorsTjay Tjien Tjioe, Henricus Antonius Maria Duisters
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Abstract
The invention relates to a method for contacting molten urea with a gas stream that contains ammonia and/or carbon dioxide, in which use is made of an additional stream the temperature of which differs from the temperature of the molten urea and/or the gas stream. The additional stream preferably contains ammonia. The method is preferably part of a process for the preparation of melamine.
Claims15
Method for contacting molten urea with a gas stream that contains ammonia and/or carbon dioxide, characterized in that use is made of an additional stream the temperature of which differs from the temperature of the molten urea and/or the gas stream.
Method for the treatment of molten urea containing carbon dioxide, characterised in that the method comprises the steps of:
- bringing the molten urea into contact with an ammonia-containing stream, whereby gaseous carbon dioxide-enriched ammonia and molten urea having a reduced amount of carbon dioxide are formed;
- separating the gaseous carbon dioxide-enriched ammonia from the molten urea having a reduced amount of carbon dioxide.
Dependencies are inferred from the claim text.