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. 01, 2019
Filed:
Sep. 21, 2016
Daicel Corporation, Osaka-shi, Osaka, JP;
Hiroyuki Miura, Himeji, JP;
Yoshihisa Mizutani, Himeji, JP;
DAICEL CORPORATION, Osaka-Shi, Osaka, JP;
Abstract
A process for stably and safely producing acetic acid without increasing an internal pressure of a distillation column is provided. The process comprises () a carbonylation reaction step for allowing methanol to react with carbon monoxide; () a flash step for separating the reaction mixture into a volatile phase and a less-volatile phase; () a first distillation step for separating the volatile phase into a first overhead and a crude acetic acid stream rich in acetic acid; and () a separation step for separating at least acetaldehyde from the first overhead. The separation step () comprises () a second distillation step for distilling the first overhead while controlling an internal pressure of a distillation column provided with a pressure control unitto form a second overhead rich in acetaldehyde and methyl iodide and a bottom or lower stream, and () an extraction step for extracting acetaldehyde from the second overhead to form an extract rich in acetaldehyde and a raffinate rich in methyl iodide.