Method for recovering crude 1,3-butadiene by extractive distillation from a C4 cut

US7226527B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Gerd Bohner · Malsch, DE
• Klaus Kindler · Speyer, DE
• Melanie Pahl · Mannheim, DE
• Gerd Kaibel · Lampertheim, DE

Key dates

• Filing date: Feb 6, 2002
• Grant date: Jun 5, 2007
• Expiry date: Jan 15, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/09
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for recovering crude 1,3-butadiene from a C4 fraction by extractive distillation using a selective solvent in a dividing wall column (TK) in which a dividing wall (T) is arranged in the longitudinal direction of the column to form a first subregion (A), a second subregion (B) and a lower common column region (C) and which is preceded by an extractive scrubbing column (K) is proposed.