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. 13, 2018
Filed:
Feb. 12, 2014
Basf SE, Ludwigshafen, DE;
Hermann Luyken, Ludwigshafen, DE;
Stephanie Jaegli, Mannheim, DE;
Michael Lorenz, Ludwigshafen, DE;
Gordon Brasche, Frankfurt, DE;
Markus Jegelka, Mannheim, DE;
Barbara Becker, Mannheim, DE;
Robert Baumann, Mannheim, DE;
Johann-Peter Melder, Boehl-Iggeelheim, DE;
Boris Buschhaus, Heidelberg, DE;
Thomas Krug, Worms, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to a process for preparing ethylenediamine (EDA), where the process comprises the steps a) to c). In step a), formaldehyde is reacted with hydrocyanic acid (HCN) to form formaldehyde cyanohydrin (FACH), where the hydrocyanic acid is completely free or largely free of sulfur dioxide (SO). The FACH prepared in this way is reacted with ammonia (NH) to form aminoacetonitrile (AAN) in step b), whereupon a hydrogenation of AAN in the presence of a catalyst to form EDA is carried out in step c).