Cleaning device for gas flows from isocyanate production

US10919845B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Manfred Kobylka · Burscheid, DE
• Michael Merkel · Hof, DE
• Dominik Duerig · Aachen, DE
• Bernhard Seidel · Murnau am Staffelsee, DE

Key dates

• Filing date: Mar 29, 2018
• Grant date: Feb 16, 2021
• Expiry date: Mar 29, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/151
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a cleaning device for separating an organic isocyanate produced by the reaction of an organic amine with a stoichiometric excess of phosgene in the gas phase from the gaseous raw product obtained in the reaction, said device comprising a first separating body comprising at least one raw product supply line for a gaseous raw product flow containing at least the isocyanate, hydrogen chloride and non-reacted phosgene, a first liquid supply line for a liquid flow containing at least one quench liquid, and a first liquid discharge line for a liquid flow containing at least part of the quench liquid and part of the isocyanate, a first gas line for transporting a gas flow containing at least hydrogen chloride, evaporated quench liquid and phosgene leading away from the first separating body. The invention is characterized in that at least one addition body for directly introducing at least one cooling fluid for an at least partial condensation and/or absorption of the gas flow that can be guided via the first gas line is associated with the first gas line.