Abstract: A continuous powder catalyst supply apparatus and a catalyst supply system that is suitable for olefin gas phase polymerization. The supply apparatus comprises a catalyst storage chamber having a catalyst inlet port and a catalyst supply port for transmitting the catalyst to the reactor. Inside the catalyst storage chamber is a catalyst supply mechanism which substantially continuously supplies the catalyst to the catalyst supply port, and a forcible discharge mechanism which forcibly discharges the catalyst, supplied from the catalyst supply mechanism, through the catalyst supply port with a pressurized gas. The apparatus can be used to supply the catalyst to the reactor with low amounts of pressurized gas. Further, the system can be configured so as to avoid contamination of stored catalyst by reactant gas.

Abstract: A powder feeding apparatus comprising a holding hopper for holding a powder, a metering hopper for metering the powder from the holding hopper, a mechanism for opening and closing a discharge opening in the metering hopper, a controller for controlling the hopper opening-closing mechanism, and a trough where the powder discharged in a heap from the metering hopper is smoothed into a layer.

Abstract: A powder feeding device comprising a metering hopper for metering a powdery material supplied from a holding hopper, a weight measuring device for measuring the weight of the powdery material in the metering hopper, a device for opening and closing a discharge opening formed in the metering hopper and a control device for controlling the action of the opening and closing device. The control device has a timer, a device for setting a discharge interval, and a device for correcting the standard discharge interval set by the discharge interval setting device. The discharge interval correcting device corrects the standard discharge interval on the basis of a measured signal from the weight measuring device.

Abstract: A powder feeding apparatus comprising a powder storage receptacle for defining a space to hold a powder and a metering chamber disposed beneath the holding space for receiving the powder flowing from the holding space. The powder is metered in the metering chamber and discharged. The apparatus includes a metering section having a metering space for defining the metering chamber and a metering adjusting member disposed slidably in the metering space of the metering section. The volume of the metering chamber is adjusted by sliding the metering adjustment member.