Methods for removing amine contaminants from equipment used in the production of polyether polyols

US11529657B2 · kind B2 · utility

Assignee

• Covestro LLC · US

Inventors

• Jenna L. Caputo · Glendale, US
• Mark A. Christman, II · Woodsfield, US
• Charles D. Starkey · New Martinsville, US
• Daniel Wagner · Bad Dürkheim, DE
• Nigel Barksby · Dorpsstraat, US

Key dates

• Filing date: Mar 9, 2021
• Grant date: Dec 20, 2022
• Expiry date: Mar 9, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D2111/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Methods of removing amine contaminants from equipment used in the production of polyether polyols. These methods include: (a) contacting the equipment with an aqueous solution of a first acid; (b) discharging the aqueous solution of the first acid from the equipment; (c) contacting the equipment with an aqueous solution of an acidic metal conditioner; (d) discharging the aqueous solution of the acidic metal conditioner from the equipment; (e) contacting the equipment with an aqueous solution of an alkali metal hydroxide; and (f) discharging the aqueous solution of the alkali metal hydroxide from the equipment.