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. 10, 2014
Filed:
May. 19, 2010
Frank Mrzena, Mutterstadt, DE;
Michael Schoenherr, Frankenthal, DE;
Robert Heinz, Ludwigshafen, DE;
Thomas Heidenfelder, Hirschberg, DE;
Frank Mrzena, Mutterstadt, DE;
Michael Schoenherr, Frankenthal, DE;
Robert Heinz, Ludwigshafen, DE;
Thomas Heidenfelder, Hirschberg, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process for the preparation of a spray-dried powder containing at least one glycine-N,N-diacetic acid compound of a formula MOOC—CHR—N(CHCOOM), where R is a C-alkyl and M is an alkali metal, the process including: preparing an aqueous solution containing the glycine-N,N-diacetic acid compound; concurrently passing the aqueous solution and air into a spray-drying apparatus; atomizing the aqueous solution by feeding the aqueous solution onto a rotating disk or by compressing the aqueous solution with a pump to a pressure of ≧20 bar absolute, to obtain fine liquid droplets; and drying the droplets, to obtain the spray-dried powder, where a temperature gradient between the aqueous solution and the air is in a range from 70 to 350° C., and a content of the glycine-N,N-diacetic acid compound in the aqueous solution is ≧84% by weight, based on a total weight of the dry mass.