Simultaneous destruction of trace components in the reaction off-gas from the synthesis of melamine
AssigneeBASF SE
InventorsKlaus Blanck, Winfried Dethlefsen, Anton Jungbauer, Bernd Leutner, Ernst-Juergen Schier, Hans-Ulrich Schlimper, Hans H. Schneehage
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Abstract
The reaction off-gas from the synthesis of melamine consists, after separating off the melamine, mainly of ammonia and carbon dioxide, with traces of hydrogen cyanide, isocyanic acid, urea and residual melamine. To remove these trace components, the off-gas is passed over a catalyst, containing copper oxide and/or iron oxide, in the presence of steam at from 100.degree. to 500.degree. C.
Claims8
A process for the simultaneous destruction of the trace components hydrogen cyanide, isocyanic acid, urea and melamine in the reaction off-gas, consisting mainly of ammonia and carbon dioxide, which are left after thermal conversion of urea to melamine and isolation of the melamine, wherein the off-gas is passed over a catalyst, containing copper oxide and/or iron oxide, in the presence of steam at from 100.degree. to 500.degree. C.
Dependencies are inferred from the claim text.