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US 5,292,863 AGranted
Process for removing unpolymerized gaseous monomers from olefin polymers
AssigneesUnion Carbide Chemicals, Plastics Technology Corporation
InventorDuan-Fan Wang
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Abstract
A process for removing unpolymerized gaseous monomers from a solid olefin polymer containing said gaseous monomers by feeding an inert purge gas through a vessel containing constraint means which defines the upper limit of an expandable bed in the vessel and countercurrently contacting the solid polymer under expanded bed conditions.
Claims14
A process for removing unpolymerized gaseous monomers from a solid olefin polymer containing said gaseous monomers which comprises:
- (a) counter-currently passing a purge gas through said polymer in a purge vessel in an amount and at a velocity sufficient to remove substantially all of said gaseous monomers from said polymer and to form and maintain a fully expanded bed within said vessel having an upper limit defined by gas permeable, solids impermeable constraint means positioned within said vessel;
- (b) passing said gaseous stream containing said gaseous monomer through said constraint means and thence out of said vessel;
- and
- (c) discharging polymer solids from said vessel.
1 more element
Dependencies are inferred from the claim text.