Covestro LLC

Covestro Deutschland Ag

Jenna L Caputo

Daniel R Wagner

Mark A Christman, Ii

Edward P Browne

Nigel Barksby

Anthony R Loveday

Matthew S Otto

Charles D Starkey

Mark A Christman Ii

Processes are described for producing an aromatic diamine-initiated polyether polyol having a measured OH number of 300 to 500 mg KOH/g and a viscosity at 25&#xb0; C. of 5000 to 50,000 mPas. The processes include a first alkoxylation step in which an alkylene oxide consisting essentially of propylene oxide is reacted with a starter consisting essentially of aromatic diamine at a molar ratio of propylene oxide to aromatic diamine of 1.4:1 to 2.0:1 to form an alkoxylated product; and a second alkoxylation step in which an alkylene oxide consisting essentially of propylene oxide is reacted with the alkoxylated product, in the presence of an added catalyst, until the ratio of moles of propylene oxide added in the process to the moles of aromatic diamine added in the process is 4:1 to 9:1.

Processes for producing aromatic diamine-initiated polyether polyols

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

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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Bridgeville, PA, United States of America

Jenna L Caputo