Process for rapid activation of double metal cyanide catalysts

Details Process for rapid activation of double metal cyanide catalysts Process for rapid activation of double metal cyanide catalysts

B - Operations, Transporting

01

J

402/157, 402/293

B01J 37/00 (2006.01) B01J 27/26 (2006.01) C08G 65/10 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2287247

A process for activating double metal cyanide catalysts is disclosed. A polyol starter or starter/catalyst mixture is heated under vacuum under conditions effective to achieve improved stripping compared with that which can be achieved through conventional vacuum stripping. Coupling vacuum stripping with inert gas sparging or stripping in the presence of an organic solvent gives a starter/catalyst mixture that activates rapidly in an epoxide polymerization process. Rapid activation makes process start-ups reliable and reduces cycle time. The process gives polyols with lower viscosity, lower polydispersity, and lower unsaturation for better polyurethanes.

L'invention concerne un procédé permettant d'activer des catalyseurs à cyanure métallique double. Un initiateur polyol ou mélange initiateur/catalyseur est chauffé sous vide dans des conditions permettant d'améliorer l'extraction en comparaison avec celui réalisé par une extraction sous vide classique. On obtient un mélange initiateur/catalyseur très rapidement activé dans un procédé de polymérisation époxy lorsque l'on combine l'extraction sous vide avec une extraction ou un balayage d'un gaz inerte en présence d'un solvant organique. L'activation rapide rend le démarrage du procédé fiable et réduit la durée de cycle. Le procédé permet d'obtenir des polyols à faible viscosité, à faible polydispersité et à faible insaturation pour des polyuréthanes améliorés.

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