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:
Jan. 18, 2022
Filed:
Oct. 17, 2018
Applicant:
Basf SE, Ludwigshafen am Rhein, DE;
Inventor:
Hermann Luyken, Ludwigshafen am Rhein, DE;
Assignee:
BASF SE, Ludwigshafen am Rhein, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/86 (2006.01);
U.S. Cl.
CPC ...
C07C 209/86 (2013.01);
Abstract
The present invention relates to a process for removing NMEDA from a mixture comprising water (H2O), ethylenediamine (EDA) and N-methylethylenediamine (NMEDA) by a rectification in a rectification column (NMEDA removal), wherein the rectification is conducted at a bottom temperature Tof 155° C. or less and the mixture comprises at least the amount of water as required for the formation of a high-boiling azeotrope of EDA and water at the corresponding bottom temperature.