Process for removal of intermediate hydrogen from cascaded polyolefin slurry reactors
US6924340B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 2002 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Apr 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/905
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Multimodal polyolefin polymers may be prepared in series-connected polymerization reactors where a prior reactor is a slurry reactor employing light solvent as the slurry medium and hydrogen to limit polymer molecular weight, the polymer product from the prior reactor being substantially freed of hydrogen prior to entry into a subsequent polymerization reactor operating at low hydrogen pressure to produce a high molecular weight olefin. The economics and operating performance of such a series slurry reactor polyethylene process can be significantly improved through the use of an intermediate slurry transfer system and hydrogen removal apparatus that employs flash drums in series in conjunction with a warm recycle solvent slurry diluent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.