Patent US4051191A successfully refreshed from Google Patents.
US4051191A
Expired / Lapsed
US
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Solid phosphoric acid catalyzed alkylation of aromatic hydrocarbons
Assignee: Honeywell UOP LLC
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Filing: 1977-01-03
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Granted: 1977-09-27
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Expires: 1997-01-03
Abstract
Abstract A process for the alkylation of aromatic hydrocarbons using a solid phosphoric acid catalyst in which liquid phosphoric acid is removed from the bottoms stream of the rectification column to which the alkylation zone effluent is charged. The acid is removed by passing the bottoms stream into a settling vessel operated at a lower pressure and temperature than the bottom of the rectification column.
Inventors
- 👤 Dennis J. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/70; C07C7/00; C07C7/005; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
In the process for the production of alkylaromatic hydrocarbons wherein an aromatic hydrocarbon and an olefin are contacted with a solid phosphoric acid-containing catalyst in a reaction zone maintained at alkylation-promoting conditions; a reaction zone effluent stream comprising the aromatic hydrocarbon and an alkylaromatic hydrocarbon are passed into a first fractionation zone; a bottoms stream comprising the aromatic hydrocarbon and the alkylaromatic is removed from the first fractionation zone at a first temperature and then passed into a second fractionation zone at a lower pressure and at a lower second temperature; the improvement which comprises flashing the bottoms stream at an intermediate point between the first fractionation zone and the second fractionation zone and then passing the bottoms stream into a settling vessel and removing released phosphoric acid from the settling vessel to thereby reduce the amount of phosphoric acid which enters the second fractionation zone.
Claim 2
Dependent Claim
146 words
In the process for the production of alkylaromatic hydrocarbons wherein an aromatic hydrocarbon and an olefin are contacted with a solid phosphoric acid-containing catalyst in a reaction zone maintained at alkylation-promoting conditions; a reaction zone effluent stream comprising the aromatic hydrocarbon and an alkylaromatic hydrocarbon are passed into a first fractionation zone; a bottoms stream comprising the aromatic hydrocarbon and the alkylaromatic is removed from the first fractionation zone at a first temperature and then passed into a second fractionation zone at a lower pressure and at a lower second temperature; the improvement which comprises flashing the bottoms stream at an intermediate point between the first fractionation zone and the second fractionation zone and then passing the bottoms stream into a settling vessel and removing released phosphoric acid from the settling vessel to thereby reduce the amount of phosphoric acid which enters the second fractionation zone.
Claim 3
Dependent Claim
23 words
The improvement of claim 1 wherein the aromatic hydrocarbon is benzene and the olefin has from 2 to 3 carbon atoms per molecule.
References Cited (Backward Citations)
US3499826A
Cited
US3510534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |