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. 06, 2018
Filed:
Nov. 10, 2016
Applicant:
Celanese International Corporation, Irving, TX (US);
Inventors:
Ronald D. Shaver, Houston, TX (US);
Yaw-Hwa Liu, Missouri City, TX (US);
Mark O. Scates, Houston, TX (US);
Assignee:
CELANESE INTERNATIONAL CORPORATION, Irving, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/12 (2006.01); C07C 51/44 (2006.01); C07C 51/087 (2006.01); C07C 51/56 (2006.01); C07C 51/47 (2006.01);
U.S. Cl.
CPC ...
C07C 51/44 (2013.01); C07C 51/087 (2013.01); C07C 51/12 (2013.01); C07C 51/47 (2013.01); C07C 51/56 (2013.01);
Abstract
Processes for purifying acetic acid by distilling a process in a column in which acetic anhydride is formed in the lower portion of the column. The product stream withdrawn from the column comprises acetic acid, water at a concentration of no more than 0.2 wt. %, and acetic anhydride at a concentration of no more than 600 wppm. The process further comprises hydrating the acetic anhydride in the product stream to form a purified acetic acid product comprising acetic anhydride at a concentration of no more than 50 wppm.