Preparation of propene and, if desired, 1-butene

US6433240B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Peter Schwab · Bad Dürkheim, DE
• Boris Breitscheidel · Fulda, DE
• Carsten Oost · Bad Dürkheim, DE
• Ralf Schulz · Speyer, DE
• Michael Schulz · Ludwigshafen, DE

Key dates

• Filing date: Feb 1, 1999
• Grant date: Aug 13, 2002
• Expiry date: Feb 1, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Propene and, if desired, 1-butene are prepared by first reacting 1-butene and 2-butene to give propene and 2-pentene in the presence of a metathesis catalyst containing at least one compound of a metal of transition group VIb, VIIb or VIII of the Periodic Table of the Elements. The propene and 2-pentene formed are subsequently separated, and the 2-pentene is then reacted to give propene and 1-butene in the presence of a metathesis catalyst containing at least one compound of a metal of transition group VIb, VIIb or VIII. The propene and 1-butene formed are subsequently separated, and at least some of the 1-butene is discharged or at least partly isomerized to give 2-butene in the presence of an isomerization catalyst. Undischarged 1-butene and the 2-butene formed are subsequently returned to the initial reaction step, together with that part of the C4 fraction which was not reacted in the initial reaction step.