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:
Jan. 13, 2015
Filed:
Jan. 07, 2010
Stephan Schlitter, Shanghai, CN;
Michael Steiniger, Neustadt, DE;
Stefan Rittinger, Mannheim, DE;
Tilman Sirch, Schifferstadt, DE;
Steffen Maas, Bubenheim, DE;
Stephan Schlitter, Shanghai, CN;
Michael Steiniger, Neustadt, DE;
Stefan Rittinger, Mannheim, DE;
Tilman Sirch, Schifferstadt, DE;
Steffen Maas, Bubenheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
A process is provided for recovering components from a low boiler mixture which is obtained in the distillation of hydrogenation effluents from the preparation of polymethylols, by multistage distillation of the low boiler mixture having a tertiary amine, water, methanol, a polymethylol, a methylolalkanal, an alcohol and an alkanal with a methylene group in the alpha position to the carbonyl group. A first distillation stage involves separating the low boiler mixture into a higher-boiling, predominantly water-rich fraction and into a lower-boiling aqueous organic fraction having the tertiary amine. A second distillation stage involves separating the aqueous organic fraction from the first distillation stage into a predominantly amine-containing fraction and a further amine-depleted fraction. The tertiary amine is trimethylamine or triethylamine and the bottom temperature in the second distillation stage is at least 110° C.