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US 10,870,720 B2Granted
Polyolefin production with chromium-based catalysts
AssigneeUnivation Technologies, LLC
InventorsJohn H. Moorhouse, Kevin J. Cann, Mark G. Goode, Kevin R. Gross
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Abstract
A system and method for charging a chromium-based catalyst to a mix vessel; introducing a reducing agent through an entrance arrangement into the mix vessel, and agitating a mixture of the chromium-based catalyst, the reducing agent, and a solvent in the mix vessel to promote contact of the reducing agent with the chromium-based catalyst to give a reduced chromium-based catalyst.
Claims8
A reducing system for chromium-based catalyst, comprising:
- a catalyst feed system to provide a chromium-based catalyst to a mix vessel;
- a reducing agent supply system to provide a reducing agent to the mix vessel;
- and
- the mix vessel to hold a mixture comprising the chromium-based catalyst, the reducing agent, and a solvent to produce a reduced chromium-based catalyst for use in the polymerization of an olefin into a polyolefin, wherein the mix vessel comprises an agitator to agitate the mixture, and further comprises an entrance arrangement for the reducing agent, the entrance arrangement having a conduit extension to receive and direct the reducing agent into the mix vessel;
- and
- a control system to facilitate adjusting flow rate of the reducing agent to the entrance arrangement to give a desired flow index response of the reduced chromium-based catalyst, and wherein the control system facilitates adjusting a drying line-out temperature of the reduced chromium based catalyst in the mix vessel to give a desired flow index response of the reduced chromium-based catalyst.
3 more elements
Dependencies are inferred from the claim text.