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:
Sep. 01, 2015
Filed:
Apr. 19, 2012
Maria Leute, Munich, DE;
Andreas Boehm, Munich, DE;
Maria Leute, Munich, DE;
Andreas Boehm, Munich, DE;
Wacker Chemie AG, Munich, DE;
Abstract
The invention relates to a method for producing a purified solution containing L-cysteine from a fermentation broth containing L-cysteine. In said method, the fermentation broth containing L-cysteine, at a pH value from pH 6 to 9, is brought in contact with a basic anion exchanger, wherein the L-cysteine bonds to the anion exchanger. The anion exchanger is then rinsed with a first washing solution, and the bonded L-cysteine is removed from the anion exchanger by means of an acid and transferred into an eluate. Said eluate, having a pH≦4, is brought in contact with an acidic cation exchanger, wherein the L-cysteine bonds to the cation exchanger. The cation exchanger is rinsed with a second washing solution, and the bonded L-cysteine is removed from the cation exchanger by means of a strong acid.