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:
Mar. 18, 2008
Filed:
May. 06, 2002
Ortmund Lang, Quirnbach, DE;
Bernd Rumpf, Hockenheim, DE;
Matthias Frauenkron, Ludwigshafen, DE;
Dirk Funhoff, Mannheim, DE;
Thomas Manderbach, Ludwigshafen, DE;
Bernd Stein, Seeheim-Jugenheim, DE;
Ortmund Lang, Quirnbach, DE;
Bernd Rumpf, Hockenheim, DE;
Matthias Frauenkron, Ludwigshafen, DE;
Dirk Funhoff, Mannheim, DE;
Thomas Manderbach, Ludwigshafen, DE;
Bernd Stein, Seeheim-Jugenheim, DE;
BASF SE, Ludwigshafen, DE;
Abstract
In a process for the purification of triethylenediamine (TEDA) in which TEDA is vaporized and the gaseous TEDA is passed into a liquid solvent and is subsequently crystallized from this, the mother liquor obtained after the TEDA has been crystallized is extracted with an extractant which is immiscible or only slightly miscible with the solvent of the mother liquor and in which TEDA is readily soluble, and the TEDA-depleted mother liquor obtained after extraction and/or the TEDA-enriched extractant which has been used for the extraction are/is returned to the process.