Process for transitioning between incompatible catalysts...

C - Chemistry – Metallurgy – 08 – F

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C08F 2/38 (2006.01) C08F 2/34 (2006.01) C08F 2/42 (2006.01) C08F 4/42 (2006.01)

Patent

CA 2508675

The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant- free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.

La présente invention se rapporte à un procédé permettant de faire la transition entre une première réaction de polymérisation et une seconde réaction de polymérisation incompatible avec la première réaction de polymérisation dans un réacteur à phases gazeuses. Le nouveau procédé consiste à effectuer de multiples réactions de polymérisation, à capturer et à stocker un produit de polymérisation ne contenant sensiblement pas de contaminant provenant de chacune des multiples réactions de polymérisation afin de l'utiliser en tant que lit de semences sélectionné ne contenant sensiblement pas de contaminant dans une seconde polymérisation, ledit produit de polymérisation issu de chacune des multiples réactions de polymérisation étant débarrassé sensiblement de tout contaminant par désorption ou dégazage des réactifs et des contaminants et maintenu sous une forme ne contenant sensiblement pas de contaminant par stockage sous une atmosphère inerte.

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