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. 31, 2019
Filed:
May. 03, 2016
Basf SE, Ludwigshafen, DE;
Armin Stamm, Nieder-Olm, DE;
Thomas Schmidt, Neustadt, DE;
Christopher Orr, Houston, TX (US);
Jeremy Manning, Ypislanti, MI (US);
BASF SE, Ludwigshafen, DE;
Abstract
Process for making a chelating agent according to the general formula (I), R—CH(COOX)—N(CH2COOX)wherein Ris selected from hydrogen, C-C-alkyl, phenyl, benzyl, CHOH, and CHCHCOOX, Xis (MH), M being selected from alkali metal, x is in the range of from 0.6 to 1, said process comprising the following steps: (a) providing a solid, a slurry or a solution of a compound according to general formula (II a) R—CH(COOX)—N(CHCN)wherein Xis (MH), M being selected from alkali metal, y is in the range of from zero to 1, (b) contacting said solid or slurry or solution with an aqueous solution of alkali metal hydroxide, wherein the molar ratio of alkali metal ions to nitrile groups is in the range of from 0.6:1 to 0.95:1, (c) reacting said compound according to general formula (II a) with said alkali metal hydroxide.