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:
Feb. 13, 2007
Filed:
Nov. 14, 2002
Frank Schröder, Albrechtshain, DE;
Wolfgang Ruech, Taiskirchen, AT;
Christoph Neumüller, Linz, AT;
Ferdinand Koglgruber, Linz, AT;
Hans Christian Wagner, Vienna, AT;
Frank Schröder, Albrechtshain, DE;
Wolfgang Ruech, Taiskirchen, AT;
Christoph Neumüller, Linz, AT;
Ferdinand Koglgruber, Linz, AT;
Hans Christian Wagner, Vienna, AT;
AMI - Agrolinz Melamine International GmbH, Linz, AT;
Abstract
The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an aqueous solution containing alkalis, following the isolation of the off-gases, and is directly transferred into an aqueous alkaline melamine solution, out of which the melamine is then crystallized. The invention thus enables melamine to be obtained, with a melam content of less than 1000 ppm and a melem content of less than 50 ppm. The invention also relates to a quenching agent.