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:
Dec. 06, 2005
Filed:
Jun. 13, 2001
Hermann Luyken, Ludwigshafen, DE;
Frank Ohlbach, Dossenheim, DE;
Rolf-hartmuth Fischer, Heidelberg, DE;
Johann-peter Melder, Böhl-Iggelheim, DE;
Peter Bassler, Viernheim, DE;
Andreas Ansmann, Wiesloch, DE;
Günther Achhammer, Mannheim, DE;
Hermann Luyken, Ludwigshafen, DE;
Frank Ohlbach, Dossenheim, DE;
Rolf-Hartmuth Fischer, Heidelberg, DE;
Johann-Peter Melder, Böhl-Iggelheim, DE;
Peter Bassler, Viernheim, DE;
Andreas Ansmann, Wiesloch, DE;
Günther Achhammer, Mannheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention relates to a method for removing, by distillation, 6-aminocapronitrile from mixtures that contain 6-aminocapronitrile, adipodinitrile and hexamethylenediamine, by a) removing the hexamethylenediamine from the mixture while obtaining a mixture (I) that has a hexamethylenediamine content of less than 1 wt. -%, b) removing completely or partially the 6-aminocapronitrile from mixture (I) while obtaining a mixture (II) whose content in substances that have a higher boiling point as 6-aminocapronitrile under distillation conditions and that cannot be formed by dimerization reactions when 6-aminocapronitrile is thermally treated is less than 1 wt. -%, and c) completely or partially removing from mixture (II) the hexamethylenediamine that might be present while obtaining a mixture (IV) whose hexamethylenediamine content is higher than that of mixture (II), and a mixture (V) whose hexamethylenediamine content is lower than that of mixture (II).