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:
Jul. 10, 2018
Filed:
Oct. 01, 2015
Basf SE, Ludwigshafen, DE;
Bernd Schäfer, Dierbach, DE;
Wolfgang Siegel, Limburgerhof, DE;
BASF SE, Ludwigshafen am Rhein, DE;
Abstract
The present invention relates to a process for purifying the xanthophylls astaxanthin and canthaxanthin. The process comprises suspending the xanthophyll in an organic solvent or solvent mixture, treating the suspension of the xanthophyll in the organic solvent or solvent mixture at elevated temperature, and subsequent separation off of the xanthophyll from the solvent by a solid-liquid separation, wherein the organic solvent is selected from ketones of the general formula (I) and mixtures of ketones of the general formula (I) where Ris C-Calkyl and Ris selected from C-Calkyl, C-Ccycloalkyl, phenyl and benzyl, wherein the phenyl rings in the two last-mentioned radicals are unsubstituted or can have 1 or 2 methyl groups, or Rand Rtogether are linear C-Calkylene, which can bear 1, 2 or 3 methyl groups as substituents.