Processes and apparatus for bimodal slurry polymerization
US11117979B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2020 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Aug 20, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2231/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Processes and apparatus for preparing bimodal polymers are provided. In some embodiments, processes include introducing a monomer, a first diluent, a catalyst, hydrogen, at a first hydrogen concentration, and optional comonomer, to a first loop reactor to produce, under polymerization conditions, a first slurry of polymer solids. Processes may also include continuously discharging the first slurry of polymer solids from the loop reactor as a first polymerization effluent to a first flash tank; separating the first polymerization effluent in the first flash tank to provide a first concentrated polymer slurry with significantly lower hydrogen concentration; and transferring the first concentrated polymer slurry from the flash tank to a re-slurry mixer. Processes may further include introducing a re-slurry mixer diluent to the first concentrated polymer slurry to form a second concentrated polymer slurry in the re-slurry mixer that can be pumped to a second slurry loop reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.