Continuous process for gas phase coating of polymerisation catalyst
AssigneeBP Chemicals Limited
InventorsDaniel Claude Durand, Estelle Marie Joelle Meurice, Frederic Robert Marie Michel Morterol
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Abstract
A continuous process for gas phase coating of polymerisation catalyst. The polymerisation catalyst is introduced in a gas phase plug flow type reactor wherein it is submitted to polymerisation conditions in the presence of at least one monomer such that at least 95% by weight of the produced coated catalysts have a coating yield comprised between 0.5 to 2 times the average coating yield.
Claims7
Continuous process for gas phase coating of polymerisation catalyst characterised in that the polymerisation catalyst is introduced in a gas phase plug flow type reactor wherein it is submitted to polymerisation conditions in the presence of at least one monomer such that at least 95% by weight of the produced coated catalysts have a coating yield comprised between 0.5 to 2 times the average coating yield.
Process according to any of the preceding claims wherein the plug flow type reactor is horizontal or slightly inclined with a downward angle formed with the horizontal base line comprised between 1 and 7°.
Process according to any of the preceding claims wherein substantially none of the polymerisation catalyst subjected to the coating process exits the coating reactor in a non-polymerised form.
Process according to any of the preceding claims wherein substantially no coated polymerisation catalyst exhibits a coating yield lower than 20% of the average coating yield.
Process according to any of the preceding claims wherein substantially no coated polymerisation catalyst exhibits a coating yield higher than 180% of the average coating yield.
Continuous gas fluidised bed process for the polymerisation of olefin monomer selected from (a) ethylene, (b) propylene, (c) mixtures of ethylene and propylene, (d) butene and (e) one or more other alpha-olefins mixed with (a), (b), (c) and (d) in a fluidised bed reactor by continuously recycling a gaseous stream comprising at least some of the olefin through the fluidised bed in said reactor in the presence of a coated polymerisation catalyst under reactive conditions, comprising the introduction of a coated polymerisation catalyst characterised in that the coated polymerisation catalyst is obtained by the continuous gas phase coating process according to any of the preceding claims.
Dependencies are inferred from the claim text.