C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/641, 260/632
C07C 41/58 (2006.01) C07C 43/13 (2006.01) C08G 65/06 (2006.01) C08G 65/26 (2006.01) C08G 65/30 (2006.01)
Patent
CA 1339454
A method for removing double metal cyanide complex catalyst from polyether polyols is disclosed which uses alkali metal compounds and phosphorous compounds to precipitate the residual catalyst, which may then be removed by filtration. In one embodiment, a propylene oxide polyol is treated with sodium metal dispersion, capped with ethylene oxide, treated with magnesium silicate, and then filtered to remove at least a portion of the catalyst. Substantially complete catalyst removal is then achieved by treating the polyol with hypophosphorous or phosphorous acid to precipitate the remaining solubilized double metal cyanide complex catalyst residue, neutralizing the excess acid with magnesium silicate, and filtering.
612008
Arco Chemical Technology Inc.
Osler Hoskin & Harcourt Llp
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