Hoechst Aktiengesellschaft

Vinnolit Technologie Gmbh & Co.

Vintron Gmbh

Manfred Stoger

Ingolf Mielke

Peter Kammerhofer

Peter Schwarzmaier

Winfried Lork

Dieter Jaculi

Arend Greve

Helmut Grumann

Jan Wilkens

Hermann Tropp

Jurgen Eichler

Peter Hackl

Helmut Kalliwoda

A process for the preparation of 1,2-dichloroethane that is very pure with respect to chloral or/and chloral hydrate and carbon dioxide is described herein. The process comprises oxychlorination of ethylene, using hydrogen chloride and an oxygen-containing gas, and alkali treatment of the 1,2-dichloroethane produced. In the process, the carbon dioxide present in the 1,2-dichloroethane-containing organic phase is, in accordance with the invention, substantially separated out from the 1,2-dichloroethane-containing organic phase before the alkali treatment.

Process for purifying 1,2-dichloroethane

The conversion rate in the preparation of vinyl chloride by thermal cracking of 1,2-dichloroethane is determined by measuring the absorption of high-energy radiation, the pressure and the temperature of the gases issuing from the cracking furnace.

Process for the preparation of vinyl chloride

In the preparation of vinyl chloride by thermal cracking of 1,2-dichloroethane, three distillation stages are used to distill off first hydrogen chloride, then vinyl chloride and finally entrained hydrogen chloride with vinyl chloride. If, in the last stage, entrained water is not drawn off via the bottom, it is recirculated with the top product to the first stage and causes corrosion. Removal of the water at the top of the third distillation stage, advantageously by drying, prevents the corrosion.

Process and apparatus for purifying vinyl chloride

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Burgkirchen, Germany

Manfred Stoger