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. 15, 2019
Filed:
Mar. 31, 2017
Wacker Chemie Ag, Munich, DE;
Heribert Westermayer, Burghausen, DE;
Harald Michl, Mühldorf, DE;
Johann Wagner, Burgkirchen a. d. Alz, DE;
WACKER CHEMIE AG, München, DE;
Abstract
The invention relates to a method for producing vinyl acetate, said method being characterized in that a) the gaseous product mixture leaving the reactor is cooled to a temperature of 100° C. to 120° C. using one or more heat exchangers, b) the thus obtained product mixture is supplied to a distillation column which is equipped with filling elements (pre-dehydration column), c) the pre-dehydration column head product which substantially contains wafer, vinyl acetate, and ethylene is cooled, and the condensate (head product condensate) produced in the process is separated into a water phase and an organic phase (vinyl acetate phase), which substantially comprises vinyl acetate, in a phase separator, d) at least 99 wt. % of the acetic acid contained in the product mixture is separated via the bottom of the pre-dehydration column, and the head product of the pre-dehydration column contains <0.1 wt. % of acetic acid, measured in the water phase of the head product condensate, e) the ethyl acetate contained in the product mixture is separated via the bottom of the pre-dehydration column in such a quantity that the head product of the pre-dehydration column contains <600 wt. ppm ethyl acetate, measured in the vinyl acetate phase of the head product condensate, f) 70 to 100 wt. % of the vinyl acetate phase is recirculated into the pre-dehydration column, and g) a product mixture is drawn at the bottom of the pre-dehydration column, said product mixture containing 10 to 60 wt. % of vinyl acetate.