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. 01, 2011
Masahiko Shimizu, Masahiko, JP;
Ryuji Saito, Otake, JP;
Hiroyuki Miura, Himeji, JP;
Takashi Ueno, Himeji, JP;
Masahiko Shimizu, Masahiko, JP;
Ryuji Saito, Otake, JP;
Hiroyuki Miura, Himeji, JP;
Takashi Ueno, Himeji, JP;
DAICEL CORPORATION, Osaka-Shi, JP;
Abstract
A process for producing acetic acid including an acetic acid collection step for feeding a first distillation column with a volatile component at least containing acetic acid, methyl acetate, methyl iodide, water, and hydrogen iodide. Separating a first lower boiling point component as an overhead, and collecting a first liquid stream containing acetic acid. An acetic acid purification step for feeding a second distillation column with the first liquid stream, and separating a second lower boiling point component as an overhead. Collecting a second liquid stream containing acetic acid. An alkali component is added or mixed for distilling a mixture to be treated containing the first liquid stream and the alkali component in the second distillation column. In the mixture, at least one component (A) having a boiling point lower than acetic acid. The at least one component (A) having a concentration of 0.1 to 15% by weight.