Process for the polyolefin finishing

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 6/00 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2659237

A process to perform the finishing of polyolefins produced by gas-phase catalytic polymerization of one or more .alpha.-olefms in the presence of a polymerization diluent selected from a C3-C5 alkane, wherein the polyolefm granules discharged from the gas-phase reactor are subjected to: (1) a first degassing step in which said polyolefm is counter-currently contacted with a gaseous stream containing at least 85% by mol of a stripping agent selected from a C3-C5 alkane, said gaseous stream being continuously derived from the monomer recovery section of the polymerization plant; (2) a second degassing step in which said polyolefm is counter-currently contacted with steam, the amount of steam being from 10 to 200 Kg per 1000 kg of polyolefin.

L'invention concerne un procédé pour réaliser la finition de polyoléfines obtenues par polymérisation catalytique en phase gazeuse d'une ou plusieurs .alpha.-oléfines en présence d'un diluant de polymérisation choisi parmi un alcane C3-C5, les granulés de polyoléfine déchargés du réacteur en phase gazeuse étant soumis à : (1) une première étape de dégazage dans laquelle ladite polyoléfine est mise en contact à contre-courant avec un flux gazeux contenant au moins 85 % en moles d'un agent de rectification choisi parmi un alcane C3-C5, ledit flux gazeux provenant de façon continue de la section de récupération de monomères de l'installation de polymérisation; (2) une seconde étape de dégazage dans laquelle ladite polyoléfine est mise à contact à contre-courant avec de la vapeur d'eau, la quantité de vapeur d'eau étant de 10 à 200kg pour 1000kg de polyoléfine.

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