Continuous method for obtaining butenes from a C4 fraction

US7432411B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Till Adrian · Frankenthal (Pfalz), DE
• Bernd Heida · Haßloch, DE
• Klaus Kindler · Speyer, DE

Key dates

• Filing date: Apr 29, 2003
• Grant date: Oct 7, 2008
• Expiry date: Sep 19, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A continuous process for isolating butenes from a C4 fraction comprising butanes, butenes and other C3-C5-hydrocarbons by extractive distillation using a selective solvent (LM), comprising a first process stage I in a scrubbing zone (E) and a second process stage II in a degassing zone (A), wherein the liquid or a substream of the liquid is taken off from the degassing zone (A) at a theoretical plate located one or more theoretical plates below the feed point for the bottom stream (LM/C4H8) from the scrubbing zone (E), heated and/or vaporized by indirect heat exchange with the hot bottom stream (LM) from the degassing zone (A) and returned to the degassing zone (A) at the same theoretical plate or above this, with the theoretical plate from which the liquid or substream of liquid is taken off being selected so that the total energy requirement in the process stages I and II is minimized, is proposed.