Flexible preparation of propene and hexene

US6580009B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Mar 12, 2001
• Grant date: Jun 17, 2003
• Expiry date: Sep 16, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P30/40
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The process for preparing propene and hexene from a raffinate II feed stream comprising olefinic C4-hydrocarbons comprisesa) a metathesis reaction in which butenes present in the feed stream are reacted with ethene in the presence of a metathesis catalyst comprising at least one compound of a metal of transition groups VIb, VIIb or VIII of the Periodic Table of the Elements to give a mixture comprising ethene, propene, butenes, 2-pentene, 3-hexene and butanes, using, based on the butenes, from 0.05 to 0.6 molar equivalents of ethene,b) firstly fractionally distilling the product stream obtained in this way to give a low-boiling fraction A comprising C2-C3-olefins and a high-boiling fraction comprising C4-C6-olefins and butanes,c) subsequently fractionally distilling the low-boiling fraction A obtained from b) to give an ethene-containing fraction and a propene-containing fraction, with the ethene-containing fraction being returned to the process step a) and the propene-containing fraction being discharged as product,d) subsequently fractionally distilling the high-boiling fraction obtained from b) to give a low-boiling fraction B comprising butenes and butanes, a pentene-containing…