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:
Oct. 03, 2017
Filed:
Dec. 02, 2013
Daicel Corporation, Osaka-shi, Osaka, JP;
DAICEL CORPORATION, Osaka-Shi, JP;
Abstract
A process for removing acetaldehyde efficiently and producing high-purity acetic acid stably is provided. Methanol is allowed to continuously react with carbon monoxide in a carbonylation reactorin the presence of a catalyst system; the reaction mixture is continuously fed to a flasherto form a volatile phase (A) containing acetic acid and methyl iodide; the volatile phase (A) is continuously fed to a splitter columnto form an overhead (A) containing methyl iodide and acetaldehyde and a stream (B) containing acetic acid; the volatile phase (A) and/or the overhead (A) is cooled by a first condenser C, Cat a predetermined cooling temperature; and the noncondensed gaseous component is further cooled by a second condenser C, Cto form a concentrate having a lower temperature and a higher acetaldehyde concentration. Acetaldehyde is efficiently removed by distilling the concentrate having a high acetaldehyde concentration.