US4239508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cumene recovery
Assignee: Rohm and Haas Co
•
Filing: 1979-06-05
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Granted: 1980-12-16
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Expires: 1999-06-05
Abstract
Abstract A method for removing cumene vapor from a cumene-containing vapor stream comprises passing the vapor stream through a bed of a substantially dry hydrophobic, macroreticular, water-insoluble, crosslinked polymer containing from 20% to 100% by weight of the polymer, of divinylbenzene or a copolymer of divinylbenzene, the balance being ethylvinylbenzene or styrene or mixtures thereof but not more than 50% of either ethylvinylbenzene or styrene, until the capacity of the polymer or copolymer to remove cumene is substantially exhausted. Thereafter, the cumene is desorbed from the mass or bed of the polymer or copolymer by passing steam through said mass or bed. Without drying, the mass or bed is then ready for reuse.
Inventors
- 👤 Steven L. Rock
- 👤 James S. Clovis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:08
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; B01D; B01D53/00; B01D53/02; C; C07; C07C; C07C7/00; C07C7/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
A process for removing cumene vapors from a cumene containing vapor stream comprising the steps of passing said vapor stream through a mass or bed of a substantially dry, hydrophobic, macroreticular, water insoluble, cross-linked polymer consisting essentially of from about 20% to 100% by weight of divinylbenzene, the balance being ethylvinylbenzene or styrene or mixtures thereof but not more than 50% of either ethylvinylbenzene or styrene, until the capacity of the polymer to remove cumene is substantially exhausted, desorbing said cumene from said mass or bed of said polymer by passing steam through said mass or bed and again passing a cumene containing vapor stream through the wet mass or bed of polymer.
Claim 2
Dependent Claim
113 words
A process for removing cumene vapors from a cumene containing vapor stream comprising the steps of passing said vapor stream through a mass or bed of a substantially dry, hydrophobic, macroreticular, water insoluble, cross-linked polymer consisting essentially of from about 20% to 100% by weight of divinylbenzene, the balance being ethylvinylbenzene or styrene or mixtures thereof but not more than 50% of either ethylvinylbenzene or styrene, until the capacity of the polymer to remove cumene is substantially exhausted, desorbing said cumene from said mass or bed of said polymer by passing steam through said mass or bed and again passing a cumene containing vapor stream through the wet mass or bed of polymer.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein said polymer contains up to about 25% by weight of ethylvinylbenzene, based on the total weight of the polymer.
Claim 4
Dependent Claim
24 words
A process according to claim 1 wherein said polymer has a surface area of at least about 100 square meters per gram of polymer.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein said polymer has a surface area of from about 500 square meters per gram of polymer to about 1000 square meters per gram of polymer.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein said polymer is a polymer of divinylbenzene and styrene.
Claim 7
Dependent Claim
17 words
A process according to claim 1 wherein said polymer is a polymer of styrene, divinylbenzene and ethylvinylbenzene.
Claim 8
Dependent Claim
16 words
A process according to claim 1 wherein said polymer is a polymer of divinylbenzene and ethylvinylbenzene.
Claim 9
Dependent Claim
14 words
A process according to claim 1 wherein said polymer is a polymer of divinylbenzene.
Claim 10
Dependent Claim
27 words
A process according to claim 1 wherein after desorbing the cumene from the mass or bed of said polymer, said cumene is separated from the condensed steam.
Claim 11
Dependent Claim
46 words
A process according to claim 1 wherein when cumene is being desorbed from said mass or bed, a cumene containing vapor stream is being passed through at least one additional mass or bed of the substantially dry, hydrophobic, macroreticular, water insoluble crosslinked polymer of claim 1.
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |