Method and apparatus for reducing static charges during polymerization of olefin polymers
AssigneeUnivation Technologies, LLC
InventorsMark Peter Bartilucci, Ernest Raymond Davis, Jr., Brian J. Egan, Robert Olds Hagerty, Per K. Husby
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Abstract
The present invention relates to a method and apparatus for controlling static charges in a fluidized bed olefin polymerization reactor. Static charges which develop in the polymer products are measured and, if they fall outside a predetermined range, static charge control agents are introduced into the reactor. By controlling the static charges in the reactor, sheeting and drooling can be controlled.
Claims9
A method for reducing static charges during polymerization of one or more olefins in a fluidized bed reactor which comprises:
- continuously monitoring static charges within the fluidized bed;
- and
- introducing a static control agent into the reactor in amounts sufficient to create and maintain essentially neutral charges in the fluidized bed,
- wherein the continuous monitoring comprises
- (a) removing a sample of polymer from the reactor;
- and
- (b) measuring the static charge of said polymer sample using a Faraday drum.
A method for controlling the static charge during the polymerization of one or more olefins in a fluidized bed reactor comprising:
- withdrawing a polymer sample from the reactor;
- measuring the static charge of said polymer sample using a Faraday drum;
- and adding a static control agent to the reactor in an amount to create and maintain essentially neutral static charges in the fluidized bed.
A method for controlling static charges in a fluidized bed reactor comprising:
- removing a sample from the fluidized bed reactor;
- measuring the static charge of said sample using a Faraday drum;
- comparing the measured charge with a predetermined range of static charge values;
- determining if the measured static charge is outside the predetermined range of static charge values and the polarity of the measured static charge;
- and
- adding a static charge control agent to the reactor if the measured static charge lies outside the predetermined range of static charge values.
Dependencies are inferred from the claim text.