Production plant for producing a chemical product by reacting H-functional reactants with phosgene, and method for operating same with an interruption to production

US11365172B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Juergen Spriewald · Kölln-Reisiek, DE
• Thomas Knauf · Dormagen, DE
• Dirk Manzel · Moers, DE
• Peter Plathen · Krefeld, DE

Key dates

• Filing date: Jun 29, 2018
• Grant date: Jun 21, 2022
• Expiry date: May 24, 2039

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00225
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a method for operating a production plant for producing a chemical product (1) by reacting a H-functional reactant (2) with phosgene (3) during an interruption in production when taking at least one plant part of the production plant out of operation, wherein low-oxygen and oxygen-rich phosgene-containing exhaust gas flows are directed separately from one another in different phosgene decomposition directions and separately from one another—at spatially different points—into a combustion device, wherein plant parts that have not been taken out of operation are operated in a closed-circuit operating mode. The invention also relates to a production plant for producing a chemical product by reacting H-functional reactants with phosgene, which is suitable for being operated with the method according to the invention.