Wacker Chemie Ag

Wacker-Chemie Gmbh

Sulzer Chemtech Ag

Harald Michl

Franz Ramgraber

Heribert Westermayer

Johann Wagner

Peter Moritz

Claudia Von Scala

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&#xb0; C. to 120&#xb0; 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 &#x3c;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 &#x3c;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.

Method for producing vinyl acetate

Process for preparing vinyl acetate with utilization of the heat of reaction

A process and apparatus for hydrolytic cleavage of carboxylic esters and water into carboxylic acid and alcohol hydrolysis products. In the process, a portion of water required for hydrolysis is replaced by a recycled mixture of carboxylic acid and water from previously hydrolyzed carboxylic ester.

Method and device for hydrolytically obtaining a carboxylic acid and alcohol from the corresponding carboxylic ester

A process and a device for the catalytic hydrolysis of a carboxylate, e.g., methyl acetate, ethyl acetate, i- or n-propyl acetate, i- or n-butyl acetate, allyl acetate and methyl formate, into the corresponding carboxylic acid and alcohol, by a combination of a pre-reactor and a reactive distillation column are disclosed. By the combination of a pre-reactor and a reactor distillation column, the conversion ratio can be substantially improved. The device can compensate for fluctuations in the supply quantity or in the composition of the feed flow. The product composition can also be controlled in a wide range.

Process and device for hydrolytically obtaining a carboxylic acid alcohol from the corresponding carboxylate

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Kastl, Germany

Harald Michl