Method for the distillative recovery of toluylenediamine

US7342134B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Carsten Knoesche · Niederkirchen, DE
• Martin Sohn · Mannheim, DE
• Ulrich Penzel · Lauscha, DE
• Hans-Juergen Pallasch · Ludwigshafen, DE
• Gunter Georgi · Schwarzheide, DE
• Wolfgang Mackenroth · Bad Dürkheim, DE
• Hans Volkmar Schwarz · Waterloo, BE
• Stefan Maixner · Schwetzingen, DE
• Gerald Molz · Maikammer, DE
• Eckhard Stroefer · Mannheim, DE

Key dates

• Filing date: Jan 7, 2005
• Grant date: Mar 11, 2008
• Expiry date: Feb 18, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C209/84
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (2), a lower combined column region (3), a feed section (4) having a rectifying section (5) and stripping section (6), and also a withdrawal section (7) having a rectifying section (9) and stripping section (8), which comprises the following steps: