Patent US3957901A successfully refreshed from Google Patents.
US3957901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirect heat exchange in alkylation
Assignee: Phillips Petroleum Co
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Filing: 1974-04-22
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Granted: 1976-05-18
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Expires: 1994-04-22
Abstract
Abstract A side stream comprising normal butane, isopentane and heavier is withdrawn from the isostripper. This side stream is debutanized and the remaining liquid isopentane and heavier introduced into the liquid alkylate effluent of the isostripper in a controlled manner. The liquid effluent of the isostripper is used to heat another liquid side stream withdrawn from the isostripper and reintroduced into the isostripper.
Inventors
- 👤 Charles C. Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:47
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/56; C07C2/58; Y; Y10; Y10S; Y10S585/00; Y10S585/909; Y10S585/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
In the process for forming an alkylate product stream wherein an olefin and isobutane are reacted in the presence of an alkylation catalyst to form a resultant product stream comprising isobutane, n-butane, isopentane, and alkylate, wherein said resultant product stream is introduced into the upper portion of an isobutane stripping zone, wherein an isobutane vapor stream is withdrawn overhead from said isobutane stripping zone, wherein an isobutane liquid side stream is withdrawn from the isobutane stripping zone and wherein an alkylate stream is withdrawn from the bottom of said isobutane stripping zone, the improvement comprising, bringing at least a portion of said alkylate stream into indirect heat exchange relationship with said isobutane liquid side stream, and reintroducing said isobutane liquid side stream to said stripping zone after said indirect heat exchange relationship approximately at the locus of withdrawal of said isobutane liquid side stream from said stripping zone.
Claim 2
Dependent Claim
148 words
In the process for forming an alkylate product stream wherein an olefin and isobutane are reacted in the presence of an alkylation catalyst to form a resultant product stream comprising isobutane, n-butane, isopentane, and alkylate, wherein said resultant product stream is introduced into the upper portion of an isobutane stripping zone, wherein an isobutane vapor stream is withdrawn overhead from said isobutane stripping zone, wherein an isobutane liquid side stream is withdrawn from the isobutane stripping zone and wherein an alkylate stream is withdrawn from the bottom of said isobutane stripping zone, the improvement comprising, bringing at least a portion of said alkylate stream into indirect heat exchange relationship with said isobutane liquid side stream, and reintroducing said isobutane liquid side stream to said stripping zone after said indirect heat exchange relationship approximately at the locus of withdrawal of said isobutane liquid side stream from said stripping zone.
Claim 3
Dependent Claim
76 words
In a process in accordance with claim 1 wherein a vapor side stream comprising n-butane and isopentane is withdrawn from said isobutane stripping zone, bringing said isobutane liquid side stream into indirect heat exchange relationship with said vapor side stream comprising n-butane and isopentane, and bringing said isobutane liquid side stream, after said indirect heat exchange relationship with said vapor side stream, into indirect heat exchange relationship with at least a portion of said alkylate stream.
Claim 4
Dependent Claim
97 words
A process in accordance with claim 1 which includes the steps of withdrawing a vapor side stream comprising n-butane and isopentane from said isobutane stripping zone, removing n-butane from said vapor side stream comprising n-butane and isopentane in a debutanizing zone to provide for an isopentane stream from said debutanizing zone, determining the vapor pressure of said alkylate stream and generating a corresponding signal based on said vapor pressure, adding said isopentane stream from said debutanizing zone to said alkylate stream in response to said corresponding signal to form an alkylate stream having a preselected vapor pressure.
Claim 5
Dependent Claim
58 words
A process in accordance with claim 1 wherein said isobutane side stream, after said indirect heat exchange relationship is reintroduced into the isobutane stripping zone at a locus in said zone where the composition of said isobutane liquid side stream is nearly the same as the composition of the materials in the isobutane stripping zone at said locus.
Claim 6
Dependent Claim
37 words
A process in accordance with claim 2 wherein said vapor side stream comprising normal butane and isopentane is withdrawn from said isobutane stripping zone at a locus where said vapor does not contain more than 5% isobutane.
Claim 7
Dependent Claim
26 words
A process in accordance with claim 3 wherein said alkylate stream is brought into indirect heat exchange relationship with said isopentane stream from said debutanizing zone.
Claim 8
Dependent Claim
87 words
A process in accordance with claim 3 wherein said alkylate stream is divided into two alkylate streams, and wherein one of these two streams is brought into indirect heat exchange relationship with said isobutane liquid side stream and the other of these two alkylate streams is brought into indirect heat exchange relationship with said isopentane stream from said debutanizing zone, and wherein said two alkylate streams, ater said indirect heat exchange relationships, are recombined and recovered as at least a portion of the final alkylate product stream.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |