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. 25, 2015
Filed:
Oct. 24, 2012
Applicant:
Oxea Gmbh, Oberhausen, DE;
Inventors:
Guido D. Frey, Reidstadt, DE;
Kurt Schalapski, Oberhausen, DE;
Dirk Bermann, Mülheim, DE;
Norman Nowotney, Essen, DE;
Heinz Strutz, Moers, DE;
Donald K. Raff, Waynesville, NC (US);
Assignee:
OXEA GMBH, Oberhausen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 29/80 (2006.01); C07C 41/42 (2006.01); C07C 41/44 (2006.01); C07D 319/06 (2006.01); C07C 29/90 (2006.01); C07C 29/10 (2006.01); C07C 29/84 (2006.01);
U.S. Cl.
CPC ...
C07D 319/06 (2013.01); C07C 29/10 (2013.01); C07C 29/80 (2013.01); C07C 29/84 (2013.01); C07C 29/90 (2013.01); C07C 41/42 (2013.01); C07C 41/44 (2013.01);
Abstract
Process for obtaining ditrimethylolpropane and trimethylolpropane-enriched product streams from the high-boiling fractions and residues which are obtained in the distillative purification of trimethylolpropane includes three stage distillation characterized in that second and third stages are configured as thin film evaporators with a column attachment with the second stage facilitating trimethylopropane recovery and the third stage facilitating ditrimethylolpropane recovery.