Powder transfer device and polyolefin production process
AssigneeSumitomo Chemical Company, Limited
InventorsHiroyuki Ogawa, Hideki Sato
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Abstract
The present invention provides a powder transfer device that has a simple construction, yet enables the powder discharge rate to be easily controlled, as well as a polyolefin powder production process using such a powder transfer device. A powder transfer device includes a downcomer which extends downward, and a gas slider situated below the downcomer. The gas slider has, on a side thereof facing an opening at a bottom end of the downcomer, a gas dispersion plate in which a plurality of gas outlets are formed.
Claims5
A powder transfer device comprising:
- a downcomer which extends downward, and
- a gas slider situated below the downcomer,
- wherein the gas slider has, on a side thereof facing an opening at a bottom end of the downcomer, a gas dispersion plate in which a plurality of gas outlets are formed,
- wherein the gas dispersion plate comprises a facing portion that directly faces the opening at the bottom end of the downcomer, and a peripheral portion that surrounds a perimeter of the facing portion at a width W, and
- wherein when θr represents the angle of repose for the powder and L represents the distance between the bottom end of the downcomer and the gas dispersion plate, the width W of the peripheral portion satisfies the condition W≧L·cot(θr) at all points on the perimeter of the facing portion.
An olefin polymerization reactor comprising:
- a plurality of vertically arrayed polymerization stages;
- and
- a powder transfer device comprising:
- a downcomer which extends downward, and
- a gas slider situated below the downcomer;
- wherein the gas slider has, on a side thereof facing an opening at a bottom end of the downcomer, a gas dispersion plate in which a plurality of gas outlets are formed;
- wherein said gas dispersion plate has an edge that allows powder to drop down from said as dispersion plate edge;
- and
- said powder transfer device transfers a polyolefin powder that is present at an upper polymerization stage to a lower polymerization stage.
A polyolefin production process comprising the step of, in an olefin polymerization reactor having a plurality of vertically arrayed polymerization stages, transferring a polyolefin powder that is present at an upper polymerization stage to a lower polymerization stage with a powder transfer device,
- wherein said powder transfer device comprises:
- a downcomer which extends downward, and
- a gas slider situated below the downcomer;
- wherein the gas slider has, on a side thereof facing an opening at a bottom end of the downcomer, a gas dispersion plate in which a plurality of gas outlets are formed;
- wherein said gas dispersion plate has an edge that allows powder to drop down from said gas dispersion plate edge.
Dependencies are inferred from the claim text.