Method for the complete hydrodechlorination of chlorinated hydrocarbons

US5811628A · kind A · utility

Assignees

• Leuna-Katalysatoren GmbH · DE
• Buck Werke GmbH und Co. · DE

Inventors

• Klaus Weber · Hamburg, DE
• Rainer Schoedel · Leuna, DE
• Peter Birke · Hohen Neuendorf, DE
• Reinhard Geyer · Bodenwerder, DE
• Ulrich Neumann · Bodenwerder, DE
• Werner Haertwig · Bitterfeld-Wolfen, DE
• Gerhard Vogel · Elmhurst, US
• Willi Sattelmayer · Bitterfeld-Wolfen, DE
• Rudolf Schumann · Bitterfeld-Wolfen, DE
• Anette Hoppe · Bitterfeld-Wolfen, DE

Key dates

• Filing date: Jul 20, 1995
• Grant date: Sep 22, 1998
• Expiry date: Jul 20, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J38/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for the hydrodechlorination of a reaction gas primarily composed of chlorinated hydrocarbons is carried out sequentially. A first step is advantageously carried out in a tubular reactor filled with catalyst and cooled externally, to maintain a temperature within a preferred range of 80.degree. to 230.degree. C. and a radial temperature difference of not more than 40.degree. C. Hydrogen is added to the tubular reactor with a hydrogen excess in a preferred range of 1.1 to 1.5 relative to the reaction gas, based on the stoichiometric consumption. The catalyst is present in a catalyst loading in a preferred range of 0.1 to 1.5 v/vh based on the volume of reaction gas. A fixed bed reactor is advantageously used for a second step, optimally connected in straight transit with the output of the reactor of the first step. The full-space reactor is maintained at a temperature within a preferred range of 200.degree. to 300.degree. C. and a hydrogen excess relative to the stoichiometric consumption is in a preferred range of 2 to 100. Catalyst is present in a preferred amount related to a volume of catalyst in step one according to a ratio in a range of 2:1 to 10:1. The dechlorination…