Process and apparatus for purifying vinyl chloride

US5507920A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Peter Schwarzmaier · Burgkirchen an der Alz, DE
• Peter Kammerhofer · Altötting, DE
• Manfred Stoger · Altötting, DE
• Helmut Kalliwoda · Altötting, DE
• Ingolf Mielke · Altötting, DE

Key dates

• Filing date: Dec 7, 1994
• Grant date: Apr 16, 1996
• Expiry date: Dec 7, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00006
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.