Process for supplying catalyst to a polymerization reactor
AssigneeTotal Research & Technology Feluy
InventorsDaan Dewachter, Alain Brusselle
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Abstract
The present invention relates to a method for feeding metallocene catalyst slurry to an olefin polymerization loop reactor (1) using a positive displacement device (5) positive displacement device comprising a first chamber and a second chamber, each chamber having an inlet and an outlet and each chamber comprising an ball arranged between the walls of said chamber, wherein said chambers are connected to each other by a pump chamber operably connected to a pump, wherein, the difference between the diameter of said ball and the diameter of said chamber is comprised between 5 to 200 times the average particle size (d50) of said catalyst.
Claims7
Method for feeding metallocene catalyst slurry to an olefin polymerization loop reactor (1) using a positive displacement device (5) comprising a first chamber (5-6) and a second chamber (5-3), each chamber having an inlet (5-13, 5-12) and an outlet (5-18, 5-9) and each chamber comprising a ball (5-5, 5-4) arranged between the walls (5-14, 5-19) of said chamber, said chambers being operably connected to each other by a pump chamber (5-2), comprising the step of activating the pump, thereby:
- a) charging the positive displacement device (5) with catalyst slurry into the pump chamber (5-2) by aspirating catalyst slurry between the ball (5-5) and the wall (5-14) of the first chamber (5-6);
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- b) discharging the catalyst slurry into the loop reactor (1) by displacing catalyst slurry between the ball (5-4) and the wall (5-19) of the second chamber (5-3),
- wherein, the difference (54) between the diameter of each ball (5-5, 5-4) and the diameter of each chamber (5-6, 5-3) is comprised between 5 to 200 times the average particle size (d50) of said metallocene catalyst.
Dependencies are inferred from the claim text.