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:
Mar. 12, 1985
Filed:
Mar. 09, 1984
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Abstract
A process for producing 1,3-butadiene which comprises feeding a fraction comprising C.sub.4 -paraffins and C.sub.4 -olefins as the main components and being free from isobutene, 1,3-butadiene and C.sub.4 -acetylenes to a dehydrogenation or oxidative dehydrogenation step (step A), where the n-butenes contained therein is converted to 1,3-butadiene; feeding the 1,3-butadiene-containing hydrocarbon fraction thus obtained (fraction C) to an extractive distillation column (column B), in which said fraction C is distilled in an atmosphere of a selective solvent while obtaining a fraction comprising C.sub.4 -paraffins as the main hydrocarbon component from the top of the column; withdrawing a fraction comprising n-butenes as the main component as a side stream from a stage on the upper side of the aforementioned fraction C-feeding stage and on the lower side of the selective solvent-feeding stage and recycling it into step A while withdrawing a fraction comprising 1,3-butadiene as the main hydrocarbon component and also containing the selective solvent from the bottom of column B; and separating 1,3-butadiene from the 1,3-butadiene-containing fraction.