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:
Jun. 04, 2013
Filed:
Mar. 02, 2009
Alfred Oftring, Bad Duerkheim, DE;
Armin Stamm, Nieder-Olm, DE;
Friedrich Wirsing, Kaiserslautern, DE;
Gerold Braun, Ludwigshafen, DE;
Alfred Oftring, Bad Duerkheim, DE;
Armin Stamm, Nieder-Olm, DE;
Friedrich Wirsing, Kaiserslautern, DE;
Gerold Braun, Ludwigshafen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
Provided is a method for the production of aminodicarboxylic acid N,N-diacetic acids of formula (I), wherein X is independently hydrogen or an alkali metal and n is 1 or 2. Aminodicarboxylic acid-N,N-diacetic acids of high purity can be yielded. The method involves: a) reacting an aminodicarboxylic acid, with 0.8 to 1.2 mole equivalents of formaldehyde and with 0.8 to 1.2 mole equivalents of hydrocyanic acid; b) reacting the reaction products of a) with 0.8 to 1.2 mole equivalents of hydrocyanic acid and with 0.8 to 1.2 mole equivalents of formaldehyde; c) hydrolyzing in the reaction product obtained in b).