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US 5,688,910 AGranted
Process and apparatus for removing unpolymerized gaseous monomers from olefin polymers
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorDuan Fan Wang
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Abstract
There is provided a process and apparatus which utilizes a purger capable of handling different solids having different particle sizes and operating at a purge gas velocity higher than the minimum fluidization velocity of solids without gas channeling or solids backmixing. The purger has tapered walls and a conically-shaped, gas-permeable, solids-impermeable constraint means.
Claims7
An apparatus for removing unpolymerized monomers from a solid olefin polymer containing the monomers which comprises:
- a purge vessel having tapered walls wherein the vessel has a height-to-bottom-diameter ratio of 0.5:1 to 10:1 and the walls have a tapered angle based on a vertical axis of 0.5 to 15 degrees;
- a solid discharge element disposed in the lower portion of the purge vessel;
- a solids receiving hopper;
- a solids inlet disposed in the receiving hopper;
- a feeding means disposed in the receiving hopper in communication with an inlet for feeding solids to the purge vessel;
- a gas-permeable, solids-impermeable constraint means disposed below the feeding means defining the upper limit of an expanded bed of solids and defining a gas collection chamber between the top of the purge vessel and the constraint means;
- a gas entry means disposed in the purge vessel within or below the expanded bed of solids;
- and gas discharge means disposed in communication with the gas collection chamber for discharging gas from the chamber.
5 more elements
Dependencies are inferred from the claim text.