Method for producing butadiene from n-butane

US8088962B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Catharina Klanner · Mannheim, DE
• Gotz-Peter Schindler · Mannheim, DE
• Sven Crone · Schifferstadt, DE
• Frieder Borgmeier · Mannheim, DE
• Mark Duda · Ludwigshafen, DE
• Falk Simon · Bensheim, DE

Key dates

• Filing date: Jan 16, 2006
• Grant date: Jan 3, 2012
• Expiry date: May 4, 2029

Classification

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

Abstract

A process for preparing butadiene, comprising A) providing a stream (a) comprising n-butane; B) feeding stream (a) comprising into at least one first dehydrogenation zone and nonoxidatively catalytically dehydrogenating n-butane to obtain a stream (b) comprising n-butane, 1-butene, 2-butene, butadiene, hydrogen and low-boiling secondary constituents; C) feeding stream (b) and an oxygenous gas into at least one second dehydrogenation zone and oxidatively dehydrogenating n-butane, 1-butene and 2-butene to obtain a stream (c) comprising n-butane, 2-butene, butadiene, low-boiling secondary constituents, carbon oxides and steam, wherein stream (c) has a higher content of butadiene than stream (b); D) removing the low-boiling secondary constituents and steam to obtain a stream (d) substantially consisting of n-butane, 2-butene and butadiene; E) separating stream (d) into a stream (e1) consisting substantially of n-butane and 2-butene and a stream (e2) consisting substantially of butadiene by extractive distillation; F) recycling stream (e1) into the first dehydrogenation zone.