Semi-conductive coatings for a polyolefin reaction system
AssigneeUnivation Technologies, LLC
InventorsMichael E. Muhle, F. David Hussein
Life of this patent
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Abstract
A method for selecting a semi-conductive coating to be applied to at least a portion of an inner surface of a polyolefin reaction system wherein the coating has certain electrical properties and a fluidized bed reactor vessel wherein at least a portion of a reactor internal surface is coated with a semi-conductive coating is provided.
Claims17
A method of selecting a semi-conductive coating for a polyolefin reaction system comprising the steps of:
- a. determining a charge decay performance of a semi-conductive coating;
- b. selecting a semi-conductive coating based on the charge decay performance;
- and
- c. applying the selected semi-conductive coating to at least a portion of an inner surface of a polyolefin reaction system;
- wherein the charge decay performance of the selected semi-conductive coating is characterized as having a rate of charge decay of greater than 50% in 300 seconds.
A method of selecting a semi-conductive coating for a polyolefin reaction system comprising the steps of:
- a. determining an electrical charge performance characteristic of at least one semi-conductive coating;
- b. selecting a semi-conductive coating based on the electrical charge performance characteristic;
- and
- c. applying the selected semi-conductive coating to at least a portion of an inner surface of a polyolefin reaction system;
- wherein 1% to 50% of an applied electrical charge imposed is retained by the selected semi-conductive coating for at least 300 seconds.
A fluidized bed reactor vessel wherein at least a portion of a reactor internal surface is coated with a semi-conductive coating, wherein the semi-conductive coating comprises polyphenylene sulfide, a polyphenylene sulfide and polytetrafluoroethylene mixture, mineral fillers, a graphite in a polymeric base, or carbon nanotube fibers in a polymeric base, and wherein the semi-conductive coating is characterized as having either:
- i) a rate of charge decay of greater than 50% in 300 seconds, or
- ii) a normalized residual charge with an absolute value of 100 to 5,000 volts 300 seconds after applying a corona voltage with an absolute value of 8,000 to 12,000 volts.
Dependencies are inferred from the claim text.