Process of generating C.sub.3 - and C.sub.4 -olefins from a feed mixture containing C.sub.4 to C.sub.7 olefins

US5981819A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Friedrich-Wilhelm Moeller · Friedrichsdorf, DE
• Peter Koenig · Moberly, US
• Christopher Higman · Schwalbach, DE
• Hans-Dieter Holtmann · Kürten, DE

Key dates

• Filing date: Nov 14, 1997
• Grant date: Nov 9, 1999
• Expiry date: Nov 14, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G2400/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A feed mixture containing C.sub.4 -olefins to C.sub.7 -olefins is evaporated and mixed with steam in a weight ratio of H.sub.2 O:hydrocarbons in the range from 0.5:1 to 3:1. The steam containing feed mixture with an inlet temperature in the range from 380.degree. to 500.degree. C. is introduced into a reactor, which contains a bed of granular, form-selective zeolite catalyst. The zeolite is of the pentasil type and has an atomic ratio of Si:Al of 10:1 to 200:1. From the bed a product mixture is withdrawn whose temperature is 20.degree. to 80.degree. lower than the inlet temperature, and whose total content of propylene and butene isomers is at least 60 wt-% of the olefinic constituents of the feed mixture.