The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1982
Filed:
Oct. 01, 1981
Applicant:
Inventors:
Klaus Blanck, Heidelberg, DE;
Winfried Dethlefsen, Mannheim, DE;
Anton Jungbauer, Ludwigshafen, DE;
Bernd Leutner, Frankenthal, DE;
Ernst-Juergen Schier, Altleiningen, DE;
Hans-Ulrich Schlimper, Speyer, DE;
Hans H Schneehage, Weisenheim, DE;
Assignee:
BASF Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
423236 ; 423239 ; 423245 ; 423355 ; 4234 / ; 544201 ;
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.