Process and plant for producing C2-C4 olefins from methanol and/or dimethyl ether

US9724620B2 · kind B2 · utility

Assignee

• Lurgi GmbH · DE

Inventors

• Martin Rothaemel · Frankfurt am Main, DE
• Henning Buchold · Hanau, DE
• Harald Kömpel · Neu-Isenburg, DE
• Andreas Glasmacher · Frankfurt, DE
• Andreas Ochs · Bad Homburg vor der Höhe, DE

Key dates

• Filing date: Sep 19, 2006
• Grant date: Aug 8, 2017
• Expiry date: Aug 10, 2031

Classification

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

Abstract

In producing C2-C4 olefins, in particular propylene, from an educt mixture containing steam and oxygenates, such as methanol and/or dimethyl ether, the educt mixture is reacted in a reactor on a catalyst to a reaction mixture comprising low-molecular olefins and gasoline hydrocarbons, which in a first separating device is separated into a mixture rich in C5− olefins, a mixture rich in C5+ gasoline hydrocarbons, and an aqueous phase. To increase the yield of propylene the mixture rich in C5+ gasoline hydrocarbons is supplied to a second separating device, in which the aromatics contained in the mixture are separated. The residual stream largely free from aromatics is at least partly recirculated to the reactor.