Simultaneous destruction of trace components in the reaction off-gas from the synthesis of melamine

US4360504A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Blanck · Heidelberg, DE
• Winfried Dethlefsen
• Anton Jungbauer · Ludwigshafen, DE
• Bernd Leutner · Bischofswerda, DE
• Ernst-Juergen Schier · Altleiningen, DE
• Hans-Ulrich Schlimper · Speyer, DE
• Hans H. Schneehage · Bad Dürkheim, DE

Key dates

• Filing date: Oct 1, 1981
• Grant date: Nov 23, 1982
• Expiry date: Oct 1, 2001

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D53/8621
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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.