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. 12, 1991
Filed:
Dec. 20, 1988
Wolfgang Ruppert, Bickenbach, DE;
Hermann-Josef Siegert, Seeheim-Jugenheim, DE;
Rohm GmbH, Darmstadt, DE;
Abstract
In the continuous preparation of isobutyric acid by the Koch synthesis from propylene, carbon monoxide, and water or an alcohol in hydrogen fluoride under pressure, the reaction mixture, after reaction, is depressurized, a principal amount of the gaseous components to be removed is separated, the remaining liquid phase is introduced into the middle to upper region of a distillation column in which base temperature is kept above the boiling point of isobutyric acid and the head temperature is kept near the boiling point of hydrogen fluoride, and isobutyric acid is removed as a liquid of high purity from a plate below the entrance of the feed.