Polymerization process including discharging polyolefin particles from a gas-phase polymerization reactor
US11505625B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2018 |
| Grant date | Nov 22, 2022 |
| Priority date | — |
| Expiry date | Sep 4, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B2009/168
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing an olefin polymer, including the steps of forming a particulate olefin polymer in a gas-phase polymerization reactor in the presence of a C3-C5 alkane as polymerization diluent, separating discharged polyolefin particles from concomitantly discharged gas at a pressure from 1 to 2.2 MPa, degassing the polyolefin particles at a pressure from 0.1 to 0.4 MPa with a gas made from or containing a C3-C5 alkane; and transferring the separated gas and the gas from the degassing to a work-up unit operated at a pressure from 0.001 to 0.2 MPa below the pressure of the separation, wherein the gas for degassing is continuously received from the work-up unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.