Membrane-augmented polypropylene manufacturing
US6271319A · kind A · utility
24Cited by
7References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 30, 2000 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Aug 30, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/00103
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for polypropylene manufacturing, including treating a vent stream from the polymerization reactor, to recover propylene for return to the reactor. The process involves using a gas separation membrane to separate propylene from propane in the reactor vent stream. The membrane separation step results in a residue stream typically containing as much as 30% propane or more, which is vented from the polymerization process, and a permeate stream containing 95% or less propylene, which is recirculated to the polymerization reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.