Process for the removal of catalysts from polyether polyols

C - Chemistry – Metallurgy – 07 – C

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260/641, 260/233

C07C 41/34 (2006.01) C07C 43/13 (2006.01) C07H 15/08 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2023634

A PROCESS FOR THE REMOVAL OF CATALYSTS FROM POLYETHER POLYOLS ABSTRACT OF THE DISCLOSURE The present invention thus relates to a process for removing a basic catalyst from a polyether polyol having a hydroxyl number of from about 4 to 800 comprising (a) adding from about 0.7 to 10 percent by weight of water, based on said polyether polyol, to an alkaline medium containing said polyether polyol at a temperature of from about 25 to 140°C; (b) introducing about 1 to 2 times the stoichiometric amount of gaseous carbon dioxide, based on the amount of base in the alkaline reaction medium, at a temperature of from about 75 to 120°C, thereby forming a carbonate salt; (c) removing said carbonate salt by filtration to give a filtrate containing the polyether polyol; and (d) neutralizing said filtrate by adding inorganic and/or organic acids.

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