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:
Jul. 07, 2009
Filed:
Jul. 22, 2004
Bernd Heida, Ellerstadt, DE;
Bernd Heida, Ellerstadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for fractionating a crude Cfraction comprising butanes, butenes, 1,3-butadiene and small amounts of other hydrocarbons including C-acetylenes, by extractive distillation using a selective solvent, wherein the crude Cfraction () is fed into the middle region of a first extractive distillation column (K I) and the selective solvent () is fed into the column at a point above that at which the crude Cfraction () is introduced and a gaseous side stream () which comprises the C-acetylenes together with predominantly the selective solvent and in which the concentration of the C-acetylenes is below the spontaneous decomposition limit is taken off from the first extractive distillation column (K I) at a point below the feed point for the crude Cfraction () and an overhead stream () comprising the components which are less soluble than the C-acetylenes in the selective solvent is taken off from the top of the first extractive distillation column, is proposed.