Preparation of C.sub.2 -C.sub.4 -olefins from methanol/dimethyl ether

US4503281A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Feb 7, 1984
• Grant date: Mar 5, 1985
• Expiry date: Feb 7, 2004

Classification

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

Abstract

C.sub.2 -C.sub.4 -olefins are prepared by catalytic conversion of methanol and/or dimethyl ether in the presence of a zeolite catalyst at elevated temperatures, by a process in which the catalyst used is a pure borosilicate zeolite which has been tableted or extruded without a binder and treated with hydrofluoric acid and hydrochloric acid. The treatment of the catalyst with hydrofluoric acid is carried out using 0.001-1N HF, and that with hydrochloric acid is carried out using 3-25% strength acid. The time-on-stream of the catalyst is improved.