Preparation of butadiene

US7482500B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Thorsten Johann · Schifferstadt, DE
• Gotz-Peter Schindler · Mannheim, DE
• Andreas Brodhagen · Schifferstadt, DE
• Sven Crone · Schifferstadt, DE
• Regina Benfer · Altrip, DE
• Thomas Hill · Ludwigshafen, DE
• Mark Duda · Ludwigshafen, DE

Key dates

• Filing date: Dec 30, 2004
• Grant date: Jan 27, 2009
• Expiry date: May 5, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C11/167
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The disclosure relates to a process for preparing butadiene. The process involves nonoxidatively catalytically dehydrogenating butane to obtain a product gas stream containing butane, 1-butene, 2-butene, butadiene, hydrogen and secondary constituents. The 1-butene and 2-butene of the product gas stream is then oxidatively dehydrogenated to give a second gas stream containing butane,2-butene, butadiene, hydrogen, steam and secondary constituents. Next, the butane,2-butene and butadiene are separated from the second gas stream and the butane and 2-butene are then separated from the butadiene product. The butane and 2-butene are then recycled into the nonoxidative catalytic dehydrogenating zone.