Dow Global Technolgoies LLC

Haifeng Shi

David A Babb

Michael A Brammer

Wanglin Yu

Bruce D Hook

Mrunmayi Kumbhalkar

Jason S Fisk

Sung-Yu Ku

Brian Murdoch

Wu Chen

Yujun Liu

Lin Zhao

Sally Demaio-Turner

Curtis M Whaley

Jeff Johnson

Jin Yang

Brian J Murdoch

Polyethers are prepared by polymerizing an alkylene oxide in the presence of a double metal cyanide catalyst complex and certain Mmetal or semi-metal compounds. The double metal cyanide catalyst complex contains 0.5 to 2 weight percent potassium. The ability of this catalyst system to tolerate such high amounts of potassium permits the catalyst preparation procedure to be simplified and less expensive.

Polyether polymerization process

A process for separating a catalyst component from a catalyst-containing slurry by centrifugation including separating the catalyst component from the mother liquor of the catalyst-containing slurry using a stacked disc centrifuge equipped with an auto-discharging functionality. The solids discharge from the stacked disc centrifuge is enhanced by adding a washing solution to the bowl and the solids discharge chute of the stacked disc centrifuge.

Catalyst separation process

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Haifeng Shi