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Device for introducing a powder with catalytic activity into a fluidized-bed polymerization reactor

  • US 4,687,381 A
  • Filed: 03/26/1985
  • Issued: 08/18/1987
  • Est. Priority Date: 03/30/1984
  • Status: Expired due to Term
First Claim
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1. Device for introducing a catalytically active powder into a fluidized bed reactor for polymerization or copolymerization of gaseous alpha olefins, the said device being characterized in that it comprisesa storage enclosure for catalytically active powder adapted to feed the powder to a metering device, the metering device being capable of communicating sequentially with the storage enclosure and with an intermediate chamber and permitting periodic delivery into this chamber of a metered volume of the powder,the intermediate chamber being placed below the metering device to receive direct the powder delivered by the latter, the said intermediate chamber having a capacity of at least 1.1 times the volume of powder periodically delivered by the metering device,a supply tube for inert carrier gas connected to the intermediate chamber, the said tube leading into the top half of the intermediate chamber, the tube being provided with a rapid opening shut-off valve,powder conveyor piping having an internal diameter between 6 and 60 mm connecting the base of the intermediate chamber to the fluidised bed reactor, the said pipe having a horizontal portion or a portion deviating from the horizontal by not more than 30°

  • and an elbow which is situated between the outlet of the intermediate chamber and the portion of the pipe which is horizontal or which deviates from the horizontal by not more than 30°

    , and being provided with a full bore rapid opening valve situated near to the fluidized bed reactor.

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