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. 22, 2005
Filed:
Jul. 26, 2001
Applicants:
Gerhard Coufal, Leonding, AT;
Hartmut Bucka, Eggendorf, AT;
Faramarz Bairamijamal, Linz, AT;
Inventors:
Assignee:
Agrolinz Melamin GmbH, Linz, AT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D251/60 ; C07D251/62 ;
U.S. Cl.
CPC ...
Abstract
A process for preparing melamine by pyrolysis of urea in a high-pressure process, in which urea is reacted together with NHto give melamine and the melamine melt formed is fed together with further urea to a cooling reactor, with the melt being cooled to a temperature which is 1-50° C., preferably 1-30° C., above the melting point of the melamine, which is dependent on the prevailing NHpressure. Introduction of NHin countercurrent drives out the COformed, after which the melamine melt is worked up in any appropriate way.