Abstract: A downflow polymer product withdrawal system includes a withdrawal line to collect a product including a powder and a carrier gas. The line may include at least one downward sloped descending section and is absent of any non-self draining regions. The downflow system may further include a lock hopper, a fill valve between the line and the lock hopper, and a discharge valve downstream of the lock hopper. An upflow polymer product withdrawal system includes a withdrawal line to collect and discharge a product comprising a powder and a carrier gas. The line may include at least one non-vertical section including at least one upward sloped ascending section and at least one downward sloped descending section, and is absent of any non-self draining regions. The upflow system may further include a lock hopper, a fill valve between the line and the lock hopper, and a discharge valve.

Abstract: Systems and methods for detecting and controlling bed height in fluidized bed reactors are disclosed. The systems and methods employ a plurality of radiation sources and a detector array located along the outer surface of a fluidized bed reactor.

Abstract: Systems and methods for detecting and controlling bed height in fluidized bed reactors are disclosed. The systems and methods employ a plurality of radiation sources and a detector array located along the outer surface of a fluidized bed reactor.