Removal of unreacted monomers and other materials from polyolefin product particles
US11208506B2 · kind B2 · utility
1Cited by
6References
13Claims
0Family size
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Key dates
| Filing date | Apr 11, 2018 |
| Grant date | Dec 28, 2021 |
| Priority date | — |
| Expiry date | May 14, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for the removal of unreacted olefin monomer(s) from polyolefin product particles of an olefin polymerization reaction, the method including: contacting the polyolefin product particles with a countercurrent flow of a purge gas in a purge vessel under conditions allowing diffusion of unreacted monomer and other gaseous substances from the polyolefin product particles into the countercurrent flow of the purge gas to produce purged particles; wherein the velocity of the purge gas exceeds 50% of the calculated minimum fluidization velocity of the polyolefin product particles in the purge vessel (Umf), is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.