Post-treatment for polymer pellets

Details Post-treatment for polymer pellets Post-treatment for polymer pellets

C - Chemistry, Metallurgy

08

J

C08J 3/12 (2006.01) B29B 9/16 (2006.01) B29B 13/04 (2006.01)

Patent

CA 2529100

A continuous process for minimizing the agglomeration of freshly manufactured polyolefin pellets comprising the steps of: - feeding an aqueous stream containing polyolefin pellets to a tower, - cooling said polyolefin pellets during their upward flow along said tower by means of a downward flow of a cooling agent having a density higher than said polyolefin, - collecting the cooled pellets from the top of said tower after a residence time in the tower comprised between 2 and 20 minutes.

L'invention a trait à un procédé continu permettant de réduire au minimum l'agglomération de granules de polyoléfines fraîchement produites. Ledit procédé consiste : à introduire un flux aqueux contenant des granules de polyoléfines dans une colonne ; à refroidir lesdites granules de polyoléfines lors de leur écoulement ascendant dans ladite colonne, au moyen d'un écoulement descendant d'un agent frigorifique présentant une densité supérieure à celle de ladite polyoléfine ; à recueillir les granules refroidies à partir du sommet de la colonne, après qu'elles sont restées dans la colonne pendant une durée comprise entre 2 et 20 minutes.

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