Process for the production of polyether polyols

C - Chemistry – Metallurgy – 08 – G

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C08G 65/30 (2006.01) C08G 65/10 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2227834

Polyether polyols are produced by acid-catalyzed polyaddition of alkylene oxidesto starter compounds having active hydrogen atoms. Perfluoroalkylsulfonic acid salts of metals from Group IIIA of the Periodic Table of Elements (correspondingto the IUPAC Convention of 1970) are used as the catalyst. The polyaddition reaction is carried out at a temperature of from 40 to 200°C at normal pressure or pressures from 0 to 20 mbar (absolute). An inert organic solvent may optionally be included in the reaction mixture. Substantially all of the catalyst is removed from the polyether polyol-containing reaction mixture by lowering the temperature and/or by addition of a precipitating agent and/or by extraction with water. If desired, the recovered catalyst may be used in subsequent polyaddition reactions.

Production de polyéthers-polyols par polyaddition d'oxydes d'alkylène et de composés de départ renfermant des atomes d'hydrogène actif, en présence de catalyseurs à base de sels d'acide perfluoroalkylsulfonique avec des métaux du Groupe IIIA du Tableau périodique des éléments (selon la Convention de 1970 de l'UICPA). La réaction de polyaddition est effectuée à une température de 40 à 200 degrés C, à pression normale ou à des pressions (absolues) de 0 à 20 mbars. On peut ajouter facultativement un solvant organique inerte au mélange réactionnel. Pratiquement tout le catalyseur est séparé du mélange réactionnel renfermant le polyéther-polyol par abaissement de la température et (ou) par addition d'un agent de précipitation et (ou) d'extraction avec de l'eau. Le catalyseur peut être récupéré et réutilisé dans des réactions de polyaddition ultérieures.

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