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Method of applying non-linear dynamics to control a gas-phase polyethylene reactor operability

  • US 7,226,789 B2
  • Filed: 11/18/2002
  • Issued: 06/05/2007
  • Est. Priority Date: 12/17/2001
  • Status: Active Grant
First Claim
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1. A method of determining a reactor continuity comprising the steps of:

  • a. measuring system variables of the reactor during a time period to generate data, said variables comprising an acoustic emission, a differential pressure, a bed total pressure drop, a fluidized bulk density, a static voltage and a skin thermocouple measurement;

    b. filtering said data;

    c. calculating a signal from said filtered data employing chaotic non-linear dynamics wherein said signal comprises entropy, cycle time or mean deviation (MD); and

    d. comparing said calculated signal for said reactor to a calculated signal of a control reactor to detect reactor continuity comprising, detecting fluidization changes in the reactor, detecting sheeting or identifying sheeting precursors;

    wherein said reactor is an ethylene gas-phase polymerization reactor.

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