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. 05, 2016
Filed:
May. 03, 2012
Alfred Oftring, Bad Duerkheim, DE;
Maxim Weber, Limburgerhof, DE;
Gerold Braun, Ludwigshafen, DE;
Arnulf Lauterbach, Ludwigshafen, DE;
Alfred Oftring, Bad Duerkheim, DE;
Maxim Weber, Limburgerhof, DE;
Gerold Braun, Ludwigshafen, DE;
Arnulf Lauterbach, Ludwigshafen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-α-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-α-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-α-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150° C. is not exceeded during the alkaline saponification.