Process for obtaining crude 1,3-butadiene from a C4 cut

US7692053B2 · kind B2 · utility

Assignee

• BASF SE

Inventor

• Bernd Heida · Haßloch, DE

Key dates

• Filing date: Feb 4, 2005
• Grant date: Apr 6, 2010
• Expiry date: Mar 16, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S585/911
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

1,3-butadiene is obtained by extractive distillation with a selective solvent from a C4 cut comprising C4 acetylenes as secondary components in a dividing wall column having a bottom evaporator, in which a dividing wall is disposed in the longitudinal direction of the column to form a first subregion, a second subregion and a lower combined column region. The column is disposed upstream of an extractive wash column. The energy input into the dividing wall column via the bottom evaporator is controlled in such a way that a bottom stream containing solvent, C4 acetylenes and 1,3-butadiene restricted such that the loss of 1,3-butadiene is economically acceptable, is drawn off and fed to an acetylenes outgasser where the C4 acetylenes are stripped out overhead and purified solvent is obtained as the bottom stream.