US4180526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation process utilizing side draw vapor as heat source in isostripper
Assignee: Phillips Petroleum Co
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Filing: 1978-07-07
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Granted: 1979-12-25
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Expires: 1998-07-07
Abstract
Abstract An olefin and isoparaffin are contacted in the presence of an acid alkylation catalyst to form an alkylate-containing alkylation effluent. The effluent is separated with the hydrocarbon phase passing to a prefractionation zone. A side stream from the prefractionation zone is passed in indirect heat exchange relationship with an interheater of an isostripper thereby providing a majority of the heat necessary to reboil the isostripper.
Inventors
- 👤 Charles C. Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:10
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C9/00; C07C9/14; C07C9/16; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
An alkylation process comprising the steps of: contacting an olefin and isoparaffin with an acid alkylation catalyst under alkylation conditions to form an alkylate-containing alkylation effluent, passing said effluent to a phase separation zone and settling said effluent into a hydrocarbon phase and an acid catalyst phase, passing said hydrocarbon phase to a prefractionation zone wherein the hydrocarbon phase is separated into at least three fractions with one fraction being an overhead vapor fraction, another being a bottoms liquid fraction, and the third being a side draw vapor stream, changing said bottom liquid fraction to an isostripper, and passing said side draw vapor stream from the prefractionation zone in indirect heat exchange relationship with the interheater of said isostripper to thereby provide the majority of heat energy required for the isostripper.
Claim 2
Dependent Claim
131 words
An alkylation process comprising the steps of: contacting an olefin and isoparaffin with an acid alkylation catalyst under alkylation conditions to form an alkylate-containing alkylation effluent, passing said effluent to a phase separation zone and settling said effluent into a hydrocarbon phase and an acid catalyst phase, passing said hydrocarbon phase to a prefractionation zone wherein the hydrocarbon phase is separated into at least three fractions with one fraction being an overhead vapor fraction, another being a bottoms liquid fraction, and the third being a side draw vapor stream, changing said bottom liquid fraction to an isostripper, and passing said side draw vapor stream from the prefractionation zone in indirect heat exchange relationship with the interheater of said isostripper to thereby provide the majority of heat energy required for the isostripper.
Claim 3
Dependent Claim
44 words
A process in accordance with claim 1 further comprising the steps of: charging said overhead fraction from the prefractionation zone to a depropanizer, and recycling the side draw vapor stream after being passed in indirect heat exchange relationship with the isostripper to said contacting.
Claim 4
Dependent Claim
26 words
A process in accordance with claim 2 wherein said prefractionation zone is a high pressure fractionation zone and said stripping zone is a low pressure isostripper.
Claim 5
Dependent Claim
43 words
A process in accordance with claim 3 wherein the vapor side draw from the prefractionation zone and a bottoms fraction from the isostripper are passed in indirect heat exchange relationship with the feed stream to the prefractionation zone thereby heating said feed stream.
Claim 6
Dependent Claim
45 words
A process in accordance with claim 3 wherein a portion of said bottoms fraction from the prefractionation zone is flashed and the flashed vapor is being recycled to said contacting and the remaining liquid after said flashing is being charged to the isostripper as feed.
Claim 7
Dependent Claim
20 words
A process in accordance with claim 1 wherein said acid alkylation catalyst is hydrofluoric acid and said isoparaffin is isobutane.
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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |