Title:
PROCESS FOR PREPARING VINYL ACETATE
Document Type and Number:
WIPO Patent Application WO/2017/174463
Kind Code:
A8
Abstract:
The invention relates to a process for producing vinyl acetate, said process 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 water, 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 100wt.% 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.
Inventors:
WESTERMAYER HERIBERT (DE)
MICHL HARALD (DE)
WAGNER JOHANN (DE)
MICHL HARALD (DE)
WAGNER JOHANN (DE)
Application Number:
PCT/EP2017/057735
Publication Date:
September 07, 2018
Filing Date:
March 31, 2017
Export Citation:
Assignee:
WACKER CHEMIE AG (DE)
International Classes:
C07C67/055; C07C67/54; C07C69/15
Attorney, Agent or Firm:
SCHUDERER, Michael et al. (DE)
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