Continuous catalyst activator
First Claim
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1. A method comprising:
- (a) introducing a catalyst comprising chromium into a continuous catalyst activator;
(b) introducing a fluidizing gas into the continuous catalyst activator comprising 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; and
(e) controlling a continuous catalyst activator discharge process variable by adjusting a continuous catalyst activator inlet process variable, wherein the continuous catalyst activator discharge process variable is a conversion of Cr(III) to Cr(VI), a conversion of Cr(VI) to Cr(II), a catalyst color, a catalyst activity, or combinations thereof.
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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.
26 Citations
24 Claims
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1. 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 comprising 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; and (e) controlling a continuous catalyst activator discharge process variable by adjusting a continuous catalyst activator inlet process variable, wherein the continuous catalyst activator discharge process variable is a conversion of Cr(III) to Cr(VI), a conversion of Cr(VI) to Cr(II), a catalyst color, a catalyst activity, or combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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(a) monitoring a polymerization reactor process variable; (b) comparing the polymerization reactor process variable with a reactor process variable set point; and (c) adjusting a continuous catalyst activator process variable based upon a comparison of the polymerization reactor process variable and the reactor process variable set point, wherein adjusting the continuous catalyst activator process variable comprises controlling a continuous catalyst activator discharge process variable, wherein the continuous catalyst activator discharge process variable is a conversion of Cr(III) to Cr(VI), a conversion of Cr(VI) to Cr(II), a catalyst color, a catalyst activity, or combinations thereof. - View Dependent Claims (18, 19)
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20. 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 comprising 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; and (e) recycling a filtered portion of the valence-converted catalyst back to an upstream location within the continuous catalyst activator so that essentially no normally detectable amount of catalyst is lost overhead. - View Dependent Claims (21, 22, 23, 24)
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Specification