Sorption fractionation system for olefin separation
US4479812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1983 |
| Grant date | Oct 30, 1984 |
| Priority date | — |
| Expiry date | Jun 29, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P30/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A continuous fractionation technique is provided for recovering ethylene from an olefinic feedstock comprising C.sub.3.sup.+ higher olefins. This technique provides methods and means for contacting the olefinic feedstock in a counter current sorption tower with a liquid sorbent stream comprising C.sub.6.sup.+ gasoline range hydrocarbons under process conditions to selectively sorb substantially the entire C.sub.3.sup.+ olefin components from the feedstock, withdrawing an ethylene-rich vapor stream from the sorption tower and further contacting the ethylene-rich stream with a distillate range liquid hydrocarbon stream in a sponge absorber to purify the ethylene stream. Typically, the olefinic feedstock consists essentially of volatile hydrocarbons, and preferably comprises about 10 to 50 mole % ethylene and 10 to 50 mole % propene. Purified ethylene product may be recovered having an average molecular weight not greater than 28.5 under non-cryogenic conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.