Process for the removal of catalysts from polyether polyols

Details Process for the removal of catalysts from polyether polyols Process for the removal of catalysts from polyether polyols

C - Chemistry, Metallurgy

07

C

260/641.4

C07C 41/34 (2006.01) C07C 43/11 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2010433

The present invention relates to a process for removing a basic catalyst from a polyether polyol having a hydroxyl number of from 4 to 250 comprising adding from 0.7 to 7 percent by weight of water, based on the polyether polyol, to an alkaline reaction medium containing the polyether polyol at a temperature of from 20 to 120°C; introducing 1 to 2 times the stoichiometric amount of gaseous carbon dioxide at a temperature of from 75 to 120°C, thereby forming a carbonate salt; and removing the carbonate salt by filtration.

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