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:
Apr. 09, 2013
Filed:
Jul. 23, 2008
Gunnar Heydrich, Limburgerhof, DE;
Gabriele Gralla, Mannheim, DE;
Klaus Ebel, Lampertheim, DE;
Wolfgang Krause, Brühl-Rohrhof, DE;
Nawid Kashani-shirazi, Ilvesheim, DE;
Gunnar Heydrich, Limburgerhof, DE;
Gabriele Gralla, Mannheim, DE;
Klaus Ebel, Lampertheim, DE;
Wolfgang Krause, Brühl-Rohrhof, DE;
Nawid Kashani-Shirazi, Ilvesheim, DE;
BASF SE, , DE;
Abstract
The present invention relates to a continuous process for preparing racemic or optically active menthol in pure or enriched form by distillatively separating menthol from substance mixtures which comprise essentially menthol and diastereomers thereof. This distillatiive separation is performed in a dividing wall column with 50 to 300 theoretical plates and one or more side draw points at an absolute operating pressure of 5 to 500 mbar.