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:
May. 08, 2001
Filed:
May. 21, 1999
Applicant:
Inventors:
Stefan Hess, Gross-Berau, DE;
Michael Mark, Frankfurt, DE;
Melchior A. Meilchen, Houston, TX (US);
Johann Stamm, Frankfurt, DE;
Thomas Vernaleken, Weiterstadt, DE;
Martin Wagner, Frankfurt, DE;
Assignee:
Celanese GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/34 ; C07C 6/754 ;
U.S. Cl.
CPC ...
B01D 3/34 ; C07C 6/754 ;
Abstract
A process for working up crude, liquid vinyl acetate feed containing acetic acid, water and ethyl acetate and optionally smaller amounts of other impurities by distillation, wherein there is introduced into the distillation column, above the feed point of the crude, liquid vinyl acetate, 0.1 to 5% by weight of water, based on the crude, liquid vinyl acetate feed, and 0.1 to 60% by weight of acetic acid, based on the crude, liquid vinyl acetate feed.