Process for purifying polyols

Details Process for purifying polyols Process for purifying polyols

C - Chemistry, Metallurgy

07

C

C07C 41/38 (2006.01) C08G 65/30 (2006.01)

Patent

CA 2175191

A process for reducing the level of metal ions and/or metal compounds is a polyoxyalkylene monool or polyol having a number average molecular weight of above 500-25000 by bringing the monool or polyol into contact with an extracting compound which is a polyol or a polyol mixture having a number average molecular weight of at most 500 and being immiscible with the polyoxyalkylene monool or polyol, mixing the extracting compound and the polyoxyalkylene monool or polyol, allowing the extracting compound and the polyoxyalkylene monool or polyol to separate and removing the extracting compound.

Ce procédé destiné à réduire le niveau des ions métalliques et/ou des composés métalliques dans un monool ou un polyol de polyoxyalkylène possédant un poids moléculaire moyen numérique de 500 à 25000, consiste à mettre en contact le monool ou le polyol avec un composé d'extraction qui est un polyol ou un mélange de polyols possédant un poids moléculaire moyen numérique d'au maximum 500 et qui est immiscible dans le monool ou le polyol de polyoxyalkylène, à mélanger le composé d'extraction avec le monool ou le polyol de polyoxyalkylène, puis à laisser le composé d'extraction et au monool ou au polyol de polyoxyalkylène se séparer, et enfin à enlever le composé d'extraction.

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