Preparation of C5-/C6-olefins

US6538168B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Peter Schwab · Bad Dürkheim, DE
• Michael Schulz · Ludwigshafen, DE
• Ralf Schulz · Speyer, DE
• Sylvia Huber · Zwingenberg, DE

Key dates

• Filing date: Jul 6, 2000
• Grant date: Mar 25, 2003
• Expiry date: Jul 6, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/52
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing C5/C6-olefins from an olefinic starting stream comprising C4-hydrocarbons comprisesa) carrying out a metathesis reaction in the presence of a metathesis catalyst so as to convert the 1-butene, 2-butene and isobutene present in the starting stream into a mixture of C2-C6-olefins and butanes,b) firstly fractioning the resulting product stream by distillation to give a low boiler fraction A comprising C2-C4-olefins and butanes or C2-C3-olefins, which is discharged, and a high boiler fraction comprising C4-C8-olefins and butanes,c) fractioning the high boiler fraction from b) by distillation to give a low boiler fraction B comprising butenes and butanes, an intermediate boiler fraction C comprising pentene and methylbutene and a high boiler fraction D comprising hexane and methylpentene,d) where all or part of the fraction B and/or C are recirculated to the process step a) and the fraction D is discharged as product.