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:
Aug. 21, 2012
Filed:
Oct. 28, 2008
Rolf Pinkos, Bad Duerkheim, DE;
Gerd-dieter Tebben, Mannheim, DE;
Thomas Krug, Worms, DE;
Tilman Sirch, Schifferstadt, DE;
Todd C Spengeman, Sugar Land, TX (US);
Stephanie A. Bejune, Angleton, TX (US);
Jeffrey T. Andress, Lake Jackson, TX (US);
Todd Gasiorowski, Lake Jackson, TX (US);
Rolf Pinkos, Bad Duerkheim, DE;
Gerd-Dieter Tebben, Mannheim, DE;
Thomas Krug, Worms, DE;
Tilman Sirch, Schifferstadt, DE;
Todd C Spengeman, Sugar Land, TX (US);
Stephanie A. Bejune, Angleton, TX (US);
Jeffrey T. Andress, Lake Jackson, TX (US);
Todd Gasiorowski, Lake Jackson, TX (US);
BASF SE, Ludwigshafen, DE;
Abstract
The present invention provides a process for preparing ε-caprolactone in a purity of more than 99% by cyclizing 6-hydroxycaproic esters in the liquid phase at from 150 to 400° C. and from 1 to 1020 hPa abs., and removing and condensing the compounds which are volatile under cyclization conditions, which comprises thermally treating the remaining bottom product of the cyclization in at least one further reactor, removing and condensing volatile compounds and obtaining ε-caprolactone by distillation from the condensates.