Covestro LLC

Daniel R Wagner

Jack R Reese

Jenna L Caputo

Mark A Christman, Ii

Brian L Neal

Nigel Barksby

Anthony R Loveday

Matthew S Otto

Charles D Starkey

Jenna Caputo

Chuck Starkey

Mark Christman

Mark A Christman Ii

Disclosed are methods for purifying polyols containing oxyalkylene units that is an alkali metal catalyzed alkoxylation reaction product of an alkylene oxide and an H-functional starter. The methods include neutralizing the alkali metal ions with an aqueous solution comprising water and sulfuric acid, in which: (i) the sulfuric acid is present in an amount of no more than 5% by weight, based on the total weight of the aqueous solution, and (ii) the sulfuric acid is used in an amount of 2% to 10% more than the theoretical amount necessary to neutralize all of the alkali metal ions present. The methods can produce polyols having a low content of 2-methyl-2-pentenal.

Methods for purifying polyols containing oxyalkylene units to reduce 2-methyl-2-pentenal content

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.

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

Batch 'water processes' for producing high functionality polyether polyols from polyhydroxyl compounds that are solid at ambient conditions, such as is the case with sucrose, are disclosed. The disclosed processes avoid use of an intermediate dewatering step.

Water processes for producing polyether polyols from solid polyhydroxyl compounds

Disclosed are processes and systems for removing water from a polyether polyol that employs a controlled temperature and pressure profile.

Processes for removing water from a polyether polyol

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Pittsburgh, PA, United States of America

Daniel R Wagner