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:
Aug. 07, 2007
Filed:
Jan. 16, 2004
Christian Kuhrs, Heidelberg, DE;
Eckehard Danz, Ludwigshafen, DE;
Wolfgang Steiner, Friedelsheim, DE;
Ralf-thomas Rahn, Mannheim, DE;
Thomas Grassler, Limburgerhof, DE;
Reiner Geier, Mannheim, DE;
Klaus Harth, Hong Kong, CN;
Markus Hölzle, Kirchheim, DE;
Christian Kuhrs, Heidelberg, DE;
Eckehard Danz, Ludwigshafen, DE;
Wolfgang Steiner, Friedelsheim, DE;
Ralf-Thomas Rahn, Mannheim, DE;
Thomas Grassler, Limburgerhof, DE;
Reiner Geier, Mannheim, DE;
Klaus Harth, Hong Kong, CN;
Markus Hölzle, Kirchheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The present invention relates to a process for the catalytic preparation of melamine by decomposition of urea over particular solid catalysts using a main reactor and an after-reactor. A catalyst having a low Lewis acidity is used in the main reactor and a catalyst having an equal or preferably higher Lewis acidity is used in the after-reactor.