Patent ID: 6472483
Filing Date: 2002-10-29
Classification: B01J,C08F

Abstract:
A method for operating a fluidized bed polymerization reactor to remove a granular product therefrom, the reactor having a fluidized bed height H above a distributor plate and being operated in a condensing mode, comprising:(a) operating the reactor in condensing mode;, (b) moving the granular product from the reactor, by opening an upper discharge valve for an upper discharge port in the reactor at a height from 0.21H to 0.6H, to a product discharge tank after opening the upper discharge valve; (c) venting the product discharge tank from a vent to the reactor, the product discharge tank being vented to the reactor at least 0.1H higher than the upper discharge port; and (d) removing larger particles or agglomerates from the distribution plate by opening a lower discharge valve for a lower discharge port at a level lower than the upper discharge port and no higher than 0.2H.