Preparation of olefins from methanol and/or dimethyl ether

US4433188A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Hoelderich · Bischofswerda, DE
• Wolf D. Mross · Bischofswerda, DE
• Matthias Schwarzmann · Schifferstadt, DE

Key dates

• Filing date: Sep 1, 1982
• Grant date: Feb 21, 1984
• Expiry date: Sep 1, 2002

Classification

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

Abstract

A process for the preparation of lower olefins from methanol or dimethyl ether by catalytic conversion at from 300.degree. to 550.degree. C. in two stages over borosilicate zeolites, wherein C.sub.2 -C.sub.4 -olefins and C.sub.1 -C.sub.4 -paraffins are removed after the first reaction stage, the C.sub.5.sup.+ hydrocarbons are passed to the second reaction stage, the aromatics are removed from the reaction product of the second stage and the remaining reaction products are recycled. The advantage of this process is an improvement in the yield of olefins.