Method for producing polyether carbonate polyols

US10836858B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Jörg Hofmann · Krefeld, DE
• Urs Rauwald · Düsseldorf, DE
• Stefanie Braun · Cologne, DE
• Matthias Wohak · Dormagen, DE
• Hartmut Nefzger · Pulheim, DE
• Nicole Welsch · Cologne, DE
• Aurel Wolf · Wülfrath, DE
• Michael Traving · Burscheid, DE
• Lars Krueger · Leverkusen, DE

Key dates

• Filing date: Jun 20, 2017
• Grant date: Nov 17, 2020
• Expiry date: Aug 8, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2696
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing polyether carbonate polyols by adding alkylene oxides and carbon dioxide to an H-functional starter substance in the presence of a double metal cyanide (DMC) catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, wherein (γ) alkylene oxide and carbon dioxide are added to an H-functional starter substance in a reactor with a total pressure (absolute) of 5 to 120 bar in the presence of a double metal cyanide catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, and a reaction mixture containing the polyether carbonate polyol is obtained, (δ) the reaction mixture obtained in step (γ) remains in the reactor or is optionally continuously transferred to a downstream reactor at a starting total pressure (absolute) of 5 to 120 bar, the content of free alkylene oxide in the reaction mixture being reduced in the course of a downstream reaction in each case, and the total pressure (absolute) can be reduced by up to 50% during the step (δ), and (ζ) the content of highly volatile components of the obtained reaction mixture is thermally reduced at a temperature of 80…