Continuous catalyst activator
First Claim
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1. A polymerization system comprising:
- (a) a polymerization reactor,(b) a continuous catalyst activator comprising;
a fluidized bed, wherein the continuous catalyst activator comprises;
(1) a substantially horizontal fluidized bed vessel;
(2) a gas distributor plate extending substantially horizontal within the fluidized bed vessel being arranged to allow passage of a fluidizing gas throughout the fluidized bed vessel;
(3) an inlet for introducing a catalyst into the fluidized bed vessel;
(4) at least one zone dividing wall for dividing the fluidized bed vessel into a plurality of zones, at least one of the zone dividing walls comprising a zone opening that allows the catalyst to be introduced into a next downstream zone, the plurality of zones being located substantially horizontal in relation to one another; and
(5) each zone comprising at least one baffle, each baffle defining a stage, each zone comprising a lower boundary that comprises at least a portion of the gas distributor plate, and(c) a controller programmed with an algorithm to control a polymerization reactor process variable by adjusting a continuous catalyst activator process variable, and wherein at least one of the following conditions is satisfied;
the continuous catalyst activator further comprises a filter apparatus adapted to remove any catalyst particles entrained in the fluidizing gas; and
/orthe polymerization system further comprises an inlet titanation agent disperser.
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Abstract
Methods and systems for preparing catalyst, such as chromium catalysts, are provided. The valence of at least a portion of the catalyst sent to an activator is changed from Cr(III) to Cr(VI). The catalyst is prepared or activated continuously using a fluidization bed catalyst activator.
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Citations
20 Claims
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1. A polymerization system comprising:
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(a) a polymerization reactor, (b) a continuous catalyst activator comprising;
a fluidized bed, wherein the continuous catalyst activator comprises;(1) a substantially horizontal fluidized bed vessel; (2) a gas distributor plate extending substantially horizontal within the fluidized bed vessel being arranged to allow passage of a fluidizing gas throughout the fluidized bed vessel; (3) an inlet for introducing a catalyst into the fluidized bed vessel; (4) at least one zone dividing wall for dividing the fluidized bed vessel into a plurality of zones, at least one of the zone dividing walls comprising a zone opening that allows the catalyst to be introduced into a next downstream zone, the plurality of zones being located substantially horizontal in relation to one another; and (5) each zone comprising at least one baffle, each baffle defining a stage, each zone comprising a lower boundary that comprises at least a portion of the gas distributor plate, and (c) a controller programmed with an algorithm to control a polymerization reactor process variable by adjusting a continuous catalyst activator process variable, and wherein at least one of the following conditions is satisfied; the continuous catalyst activator further comprises a filter apparatus adapted to remove any catalyst particles entrained in the fluidizing gas; and
/orthe polymerization system further comprises an inlet titanation agent disperser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising;
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(a) introducing a catalyst comprising chromium into a continuous catalyst activator; (b) introducing a fluidizing gas into the continuous catalyst activator to yield a fluidized bed of the catalyst; (c) heating the catalyst within the continuous catalyst activator while maintaining flow of the catalyst through the continuous catalyst activator such that the catalyst is maintained at a hold temperature for an average hold time; (d) contacting the catalyst with at least one agent to convert at least a portion of the chromium from Cr(III) to Cr(VI) to produce a valence-converted catalyst; (e) reducing at least a portion of the valence-converted catalyst from the Cr(VI) state to a Cr(II) state to produce a reduced valence-converted catalyst; (f) discharging the valence-converted catalyst from the continuous catalyst activator, wherein discharging the valence-converted catalyst from the continuous catalyst activator comprises; cooling the valence-converted catalyst in a presence of a first oxygenating agent in a separate cooling system downstream of the fluidized bed catalyst activator; and purging the valence-converted catalyst in a presence of a first inert agent in the separate cooling system; (g) introducing the valence-converted catalyst into a polymerization reactor system, or a combination of polymerization reactors; (h) polymerizing a polyolefin product with the reduced valence-converted catalyst; and (i) adjusting a process variable of the continuous catalyst activator based upon a comparison of a polymerization process variable associated with polymerizing the polyolefin product and a polymerization process variable set point. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification