公开(公告)号：DE3161712D1

公开(公告)日：1984-01-26

申请号：DE3161712

申请日：1981-10-05

Applicant: BASF AG

Inventor： BLANCK KLAUS DR ,  DETHLEFSEN WINFRIED DR ,  JUNGBAUER ANTON DR ,  LEUTNER BERND DR ,  SCHIER ERNST-JUERGEN DR ,  SCHLIMPLER HANS-ULRICH DR ,  SCHNEEHAGE HANS HENNING DR

IPC: C07D251/60 ,  B01D53/86 ,  B01J23/00 ,  B01J23/72 ,  B01J23/745 ,  C01C1/12 ,  C07B61/00 ,  B01D53/36

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 DEG to 500 DEG C.