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US 2017/0362353 A1Published application
Methods of controlling polyolefin melt index while increasing catalyst productivity
AssigneeUnivation Technologies, LLC
InventorsBruce J. Savatsky, Natarajan Muruganandam, Timothy R. Lynn, James M. Farley, Daniel P. Zilker, Jr., Fathi David Hussein
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Abstract
The catalyst productivity of a polyolefin catalyst in the methods disclosed herein may be increased by increasing the concentration of an induced condensing agent (ICA) in the reactor system. The effect the increased ICA concentration may have on a melt index may be counteracted, if necessary, in various ways.
Claims19
A method comprising:
- contacting in a fluidized bed gas phase reactor an olefin monomer with a catalyst system in the presence of an induced condensing agent (ICA) to produce a first polyolefin having a first melt index, the catalyst system comprising a metallocene catalyst;
- increasing a partial pressure of the ICA in the reactor to produce a second polyolefin having a second melt index;
- wherein increasing the partial pressure of the ICA results in a higher catalyst productivity for producing the second polyolefin when compared to the catalyst productivity for producing the first polyolefin.
Dependencies are inferred from the claim text.