C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 6/00 (2006.01) B01D 19/00 (2006.01) B01J 10/00 (2006.01) B01J 19/18 (2006.01) B01J 19/28 (2006.01) C08F 6/28 (2006.01)
Patent
CA 2332844
A method for devolatilization of a thermoplastic polymer containing at least one volatile component which includes the following three steps: heating the termoplastic polymer so that the thermoplastic polymer is a heated liquid or molten thermoplastic polymer, flowing the heated liquid thermoplastic polymer through a packed bed liquid-gas contactor by centrifugal force, and flowing a stripping gas through the packed bed countercurrent to the flow of the heated liquid thermoplastic polymer so that the volatile component volatilizes into the stripping gas from the heated liquid thermoplastic polymer by gas-liquid contacting in the packed bed; and an apparatus therefor.
L'invention concerne un procédé de suppression de composants volatils d'un thermoplastique polymère contenant au moins un composant volatil. Ledit procédé consiste à: chauffer le polymère thermoplastique de sorte qu'il se transforme en polymère thermoplastique liquide chauffé ou fondu, faire s'écouler le polymère thermoplastique liquide chauffé dans un contacteur de gaz-liquide à lit fixe sous l'effet de la force centrifuge, et à envoyer un gaz de séparation à travers le lit, à contre-courant de l'écoulement de polymère thermoplastique liquide de sorte que le composant volatil se volatilise dans le gaz de séparation, du polymère thermoplastique liquide chauffé, par contact gaz-liquide dans le lit fixe. L'invention porte aussi sur un appareil prévu à cet effet.
Cummings Clark J.
Moore Eugene R.
Quarderer George J. Jr.
Tirtowidjojo Dan
Dow Global Technologies Inc.
Smart & Biggar
The Dow Chemical Company
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