Patent US4178912A successfully refreshed from Google Patents.
Patent US3721064A successfully refreshed from Google Patents.
US3721064A
Expired / Lapsed
US
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Isothermal process for olefin separation
Assignee: Union Carbide Corp
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Filing: 1971-02-25
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Granted: 1973-03-20
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Expires: 1991-02-25
Abstract
Abstract Straight-chain and branched-chain monoolefins are separated by size selective molecular sieving in a vapor phase, isobaric, isothermal fixed bed process employing adsorption co-purge and countercurrent purge steps in cyclic sequence. The process utilizes a paraffinic hydrocarbon of higher carbon number than the olefin for the purge which permits distillation recovery of the separated olefins from the purge paraffin which is recycled. The straight chain paraffin content of the purge is greater than the straight chain olefin content of the feed whereby the molecular sieve is at least partially loaded with straight chain paraffin during all steps of the process.
Inventors
- 👤 M Symoniak
- 👤 M Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:23
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
Process according to claim 1 wherein the straight-chain and branched-chain monoolefin of the feed stream being treated both have the same number of carbon atoms and the straight chain paraffin hydrocarbon of the vapor purge stream contains from one to three more carbon atoms than said monoolefins.
Claim 2
Dependent Claim
26 words
Process according to claim 2 wherein the monoolefins of the feed stream are butenes and the straight-chain paraffin hydrocarbon of the vapor purge stream is n-hexane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |