The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 2009
Filed:
Dec. 19, 2005
Sven Crone, Limburgerhof, DE;
Catharina Klanner, Mannheim, DE;
Götz-peter Schindler, Mannheim, DE;
Mark Duda, Ludwigshafen, DE;
Frieder Borgmeier, Mannheim, DE;
Sven Crone, Limburgerhof, DE;
Catharina Klanner, Mannheim, DE;
Götz-Peter Schindler, Mannheim, DE;
Mark Duda, Ludwigshafen, DE;
Frieder Borgmeier, Mannheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for preparing butadiene, comprising nonoxidatively dehydrogenating n-butane from a stream (a) in a first dehydrogenation zone to obtain stream (b) comprising 1-butene, 2-butene, and butadiene; oxidatively dehydrogenating the 1-butene and 2-butene of (b) in the presence of an oxygenous gas in a second dehydrogenation zone to obtain stream (c) comprising n-butane, butadiene, hydrogen, and steam; compressing and cooling (c) to obtain stream (d) comprising n-butane, butadiene, hydrogen, and steam; extractively distilling (d) into stream (e) comprising butadiene and stream (e) comprising n-butane, hydrogen, and steam; optionally compressing and cooling (e) to obtain stream (f) comprising n-butane and water and stream (f) comprising n-butane and hydrogen and optionally recycling (f) into the first dehydrogenation zone; separating (f) into stream (g) comprising n-butane and stream (g) comprising hydrogen by contacting (f) with a high boiling absorbent and subsequently desorbing the gas constituents dissolved in the absorbent.