US4174353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin separation process
Assignee: Union Carbide Corp
•
Filing: 1978-06-27
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Granted: 1979-11-13
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Expires: 1998-06-27
Abstract
Abstract There is disclosed a process for the separation of ethylene or propylene from a purified, multi-component gas stream produced from the thermal cracking of hydrocarbons and containing ethylene or propylene and other low molecular weight components comprising the steps of: introducing said multi-component gas stream into an aqueous silver salt solution stream to effect the absorption and/or complexing of said contained ethylene or propylene and reaction of trace acetylenes with the silver metal ions of such solution; venting of the silver salt solution stream at reduced pressure to remove the dissolved other low molecular weight components; treating the resulting silver salt solution stream to separate the absorbed and/or complexed ethylene or propylene from the silver salt stream; further treating the resultant silver salt solution stream to release the contained trace acetylenes therefrom and provide an aqueous silver salt stream; and recycling said aqueous silver salt stream to said introducing step.
Inventors
- 👤 Arthur E. Marcinkowsky
- 👤 II George E. Keller
- 👤 Surendra K. Verma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; C07C7/148; C07C7/152; Y; Y02; Y02P; Y02P30/00; Y02P30/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
The process for the separation of ethylene or propylene from a purified, multi-component gas stream produced from the thermal cracking of hydrocarbons and containing ethylene or propylene and other low molecular weight components comprising the steps of: (a) introducing, said multi-component gas stream into an aqueous silver salt solution stream to effect the absorption and/or complexing of the contained ethylene or propylene and reaction of trace acetylenes with the silver metal ions of such solution; (b) venting of the silver salt solution stream at reduced pressure to remove the dissolved other low molecular weight components; (c) treating the resulting silver salt solution stream to separate the absorbed and/or complexed ethylene or propylene from the silver salt stream; (d) further treating the resultant silver salt solution stream to release the contained trace acetylenes therefrom and provide an aqueous silver salt stream; and (e) recycling said aqueous silver salt stream to said introducing step.
Claim 2
Dependent Claim
152 words
The process for the separation of ethylene or propylene from a purified, multi-component gas stream produced from the thermal cracking of hydrocarbons and containing ethylene or propylene and other low molecular weight components comprising the steps of: (a) introducing, said multi-component gas stream into an aqueous silver salt solution stream to effect the absorption and/or complexing of the contained ethylene or propylene and reaction of trace acetylenes with the silver metal ions of such solution; (b) venting of the silver salt solution stream at reduced pressure to remove the dissolved other low molecular weight components; (c) treating the resulting silver salt solution stream to separate the absorbed and/or complexed ethylene or propylene from the silver salt stream; (d) further treating the resultant silver salt solution stream to release the contained trace acetylenes therefrom and provide an aqueous silver salt stream; and (e) recycling said aqueous silver salt stream to said introducing step.
Claim 3
Dependent Claim
32 words
The process in accordance with claim 1, wherein said treating to separate said absorbed ethylene or propylene from said silver salt stream is effected by the addition of anti-solvent to said stream.
Claim 4
Dependent Claim
60 words
The process in accordance with claim 1, wherein said treating to separate said absorbed ethylene or propylene from said silver salt stream is effected by the concurrent release of pressure on and the increase in temperature of the stream, the pressure and temperature subsequently being returned to their initial levels prior to recycle of the stream to said introducing step.
Claim 5
Dependent Claim
48 words
The process in accordance with claim 1, wherein said aqueous silver salt solution stream is a nitrate stream containing absorbed and/or complexed ethylene or propylene and trace acetylenes is stabilized by the addition of hydrogen peroxide and the nitrate level is maintained by the addition of nitric acid.
Claim 6
Dependent Claim
23 words
The process in accordance with claim 1, wherein said further treating step comprises the release of trace acetylenes by treatment with silver permanganate.
Claim 7
Dependent Claim
25 words
The process in accordance with claim 1, wherein said further treating step comprises the release of trace acetylenes by treatment with ozone or ozone-enriched air.
Claim 8
Dependent Claim
20 words
The process in accordance with claim 1, wherein said aqueous silver salt solution is an aqueous solution of silver nitrate.
Claim 9
Dependent Claim
16 words
Process in accordance with claim 2, wherein said anti-solvent added to said stream comprises an organonitrile.
Claim 10
Dependent Claim
12 words
The process in accordance with claim 8, wherein said organonitrile is acetonitrile.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |