Dry product discharge from a gas phase polymerization reactor operating in the condensing mode
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsMark Gregory Goode, Mark Williams Blood, Timothy Joseph Howley, Billy Jack Garner, Robert Darrell Olson, Ralph Niels Hesson, Thomas Walter Pilgrim, John Roberts Parrish
Life of this patent
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Abstract
The liquid content of granular product removed from a fluidized bed polymerization reactor operating in the condensing mode is reduced or minimized by removing the product from a level in the fluidized bed which is about 0.21 to about 0.59 of its height while venting the product discharge tank to a point higher in the fluidized bed.
Claims42
A method for operating a fluidized bed polymerization reactor to remove a granular product therefrom, the reactor having a fluidized bed height H above a distributor plate and being operated in a condensing mode, comprising:
- (a) operating the reactor in condensing mode;,
- (b) moving the granular product from the reactor, by opening an upper discharge valve for an upper discharge port in the reactor at a height from 0.21H to 0.6H, to a product discharge tank after opening the upper discharge valve;
- (c) venting the product discharge tank from a vent to the reactor, the product discharge tank being vented to the reactor at least 0.1H higher than the upper discharge port;
- and
- (d) removing larger particles or agglomerates from the distribution plate by opening a lower discharge valve for a lower discharge port at a level lower than the upper discharge port and no higher than 0.2H.
A method for operating a fluidized bed polymerization reactor to remove a granular product therefrom, the reactor having a fluidized bed height H above a distributor plate and being operated in a condensing mode, comprising.
- (a) operating the reactor in condensing mode;
- (b) moving the granular product from the reactor, by opening an upper discharge valve or an upper discharge port in the reactor at a height from 0.21H to 0.8H, to a product discharge tank after opening the upper discharge,valve;
- (c) venting the product discharge tank to the reactor by opening a vent valve, the product discharge tank being vented to the reactor at least 0.1H higher than the upper discharge port, and the upper discharge valve and the-vent valve being open at the same time to create a pressure difference between the vent and the discharge port to remove the granular product from the discharge port;
- and
- (d) removing larger particles or agglomerates from the distribution plate by opening a lower discharge valve for a lower discharge port at a level lower than the upper discharge port and no higher than 0 2H.
A method for operating a fluidized bed polymerization reactor to remove a granular product therefrom, the reactor having a fluidized bed height H above a distributor plate and being operated in a condensing mode, comprising:
- (a) operating the reactor in condensing mode, the reactor running a polymerization reaction within about 10° C. of the dewpoint of a monomer feed for a polymerization reaction;
- (b) moving the granular product from the reactor, by opening an upper discharge valve for an upper discharge port in the reactor at a height from 0.21H to 0.8H, to a product discharge tank after opening the upper discharge valve;
- (c) venting the product discharge tank to the reactor by opening a vent valve, the product discharge tank being vented to the reactor at least 0.1H higher than the upper discharge port, and the upper discharge valve and the vent valve being open at the same time to create a pressure difference between the vent and the discharge port to remove the granular product from the discharge port;
- and
- (d) removing larger particles or agglomerates from the distribution plate by opening a lower discharge valve for a lower discharge port at a level lower than the upper discharge port and no higher than 0.2H.
A method for operating a fluidized bed polymerization reactor to remove a granular product therefrom, the reactor having a fluidized bed height H above a distributor plate and being operated in a condensing mode, comprising:
- (a) operating the reactor in condensing mode, the reactor running a polymerization. reaction within about 10° C. of the dewpoint of a monomer feed for a polymerization reaction;
- (b) moving the granular product from the reactor, by opening an upper discharge valve for an upper discharge port in the reactor at a height from 0.21H to 0.8H, to a product discharge tank after opening the upper discharge valve;
- (c) venting the product discharge tank to the reactor by opening a vent valve, the product discharge tank being vented to the reactor at least 0.1H higher than the upper discharge port, and the upper discharge valve and the vent valve being open at the same time to create a pressure difference between the vent and the discharge port to move the granular product from the reactor through the discharge port at least partially by gas transfer for a period of up to 70 seconds;
- and
- (d) removing larger particles or agglomerates from the distribution plate by opening a lower discharge valve for a lower discharge port at a level lower than the upper discharge port and no higher than 0.2H.
Dependencies are inferred from the claim text.