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:
Mar. 21, 2017
Filed:
Oct. 14, 2008
Andreas Kern, Mannheim, DE;
Hans-ulrich Pröbstle, Bobenheim-Roxheim, DE;
Tilo John, Speyer, DE (US);
Wolfgang Steiner, Friedelsheim, DE;
Heiko Maas, Lantau Island, CN;
Andreas Kern, Mannheim, DE;
Hans-Ulrich Pröbstle, Bobenheim-Roxheim, DE;
Tilo John, Speyer, DE (US);
Wolfgang Steiner, Friedelsheim, DE;
Heiko Maas, Lantau Island, CN;
BASF SE, Ludwigshafen, DE;
Abstract
Process for preparing melamine by converting urea in the presence of a solid catalyst in one reactor or in a plurality of reactors connected in series in the temperature range from 370° C. to 430° C., cooling and filtering the gas formed in the urea conversion, removing the melamine by desublimation and recycling a portion of the gas present after the melamine removal ('cycle gas') into the reactor or the reactors, which comprises performing all of the above stages at a pressure in the range from 4 bar abs. to 10 bar abs.