Wacker Chemie Ag

Mehmet Guenaltay

Hans-Peter Weitzel

Manfred Selig

Willibald Dafinger

Bernhard Eckl

Peter Holl

A method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene and optionally other comonomers in an aqueous medium by suspension or emulsion polymerization employs relieving pressure after completion of the polymerization of the polymerization batch and discharging the polymer dispersion. During the relieving, the gaseous phase is removed by means of a compressor. Optionally, the gaseous phase occurring during stripping is removed by the compressor and cooled by one or more heat exchangers before entry into the compressor. The liquid phases occurring in the compressor and optionally in the heat exchanger are separated from the gaseous phase and the liquid phases are given to a rectification column, and separated into a vinyl acetate monomer phase and a wastewater phase, and the vinyl acetate monomer phase is resupplied to polymerization.

Method for processing wastewater and exhaust gas condensates from the polymerization of vinyl acetate and ethylene in an aqueous medium

A method for producing vinyl acetate in a heterogeneously catalyzed, continuous gas phase process by reacting ethylene with acetic acid and oxygen in a reactor and separating the product gas stream substantially comprising ethylene, vinyl acetate, acetic acid, water, carbon dioxide and inert gases.

Method for producing vinyl acetate

In a process for the preparation of copolymers containing vinyl esters and ethylene or ethylenically unsaturated monomers by aqueous, free radical polymerization at a pressure of from 5 to 100 bar absolute by the emulsion or suspension polymerization method, after the end of the polymerization, the reaction mixture is let down to a pressure of from 0.1 to 5 bar absolute and recovery of unconverted monomers is effected by multistage fractional low-temperature condensation from the residual gas.

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Emmerting, Germany

Mehmet Guenaltay