Work-up of the mother liquor obtained in the preparation of high-purity triethylenediamine

US7345173B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ortmund Lang · Quirnbach, DE
• Bernd Rumpf · Hockenheim, DE
• Matthias Frauenkron · Freinsheim, DE
• Dirk Funhoff · Heidelberg, DE
• Thomas Manderbach · Ludwigshafen, DE
• Bernd Stein · San Diego, US

Key dates

• Filing date: May 6, 2002
• Grant date: Mar 18, 2008
• Expiry date: Apr 24, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D487/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.