Method for producing 1-butene

US7485761B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Gotz-Peter Schindler · Mannheim, DE
• Andreas Brodhagen · Schifferstadt, DE
• Thorsten Johann · Schifferstadt, DE
• Thomas Hill · Ludwigshafen, DE
• Marcus Sigl · Mannheim, DE
• Regina Benfer · Altrip, DE

Key dates

• Filing date: Oct 27, 2004
• Grant date: Feb 3, 2009
• Expiry date: May 2, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C7/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing 1-butene, which includes nonoxidatively, catalytically dehydrogenating n-butane to obtain a product gas stream of n-butane, 1-butene, 2-butene, butadiene, hydrogen, and secondary constituents; removing hydrogen and the secondary constituents to obtain a C4 product gas stream; separating the C4 product stream into a recycle stream of n-butane and a stream of 1-butene, 2-butene and butadiene by extractive distillation, and recirculating the recycle stream to the dehydrogenation zone; introducing the 1 -butene, 2-butene and butadiene stream into a selective hydrogenation zone and selective hydrogenation of butadiene to 1-butene and/or 2-butene to obtain a stream of 1-butene and 2-butene; introducing the 1-butene and 2-butene stream, and a circulating stream of 1-butene and 2-butene into a distillation zone and isolation of a product stream; and introducing the 2-butene-containing stream into an isomerization zone to obtain a circulating stream of 1-butene and 2-butene, and recirculating the circulating stream to the distillation zone.