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AssigneeBorealis AG
InventorsMohammad Al-Haj Ali, Vasileios Kanellopoulos, Apostólos Krallis, Klaus Nyfors, Pablo Ivan Aguayo Arellano, Gunter Weickert, Eric-Jan Prinsen
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The present invention relates to a process and apparatus for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a bottom zone having a generally conical shape and no fluidisation grid. The agglomerates are withdrawn by using an agglomerate trap below the bottom zone. A value of a process variable indicative of the content of agglomerates in the agglomerate trap is measured and the opening time of the valves transferring polymer to and from the agglomerate trap is adjusted based on the measured value.
A method for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the polymerisation reactor comprising a middle zone having a generally cylindrical shape, a bottom zone having a generally conical shape in direct contact with and below the middle zone and wherein a base of a fluidised bed is formed, and wherein there is no fluidisation grid in the fluidised bed reactor and an agglomerate trap below the bottom zone, the agglomerate trap having a body, a first connection comprising a first valve connecting the body to the bottom zone and a second connection comprising a second valve connecting the body to agglomerate recovery system and wherein the reactor does not comprise a fluidisation grid, the method comprising the steps of measuring a value of a process variable indicative of the content of agglomerates in the agglomerate trap;
A system for withdrawing polymer agglomerates from a fluidised bed polymerisation reactor, the system comprising:
Dependencies are inferred from the claim text.