US4457829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control method for series-connected reactors
Assignee: IFP Energies nouvelles
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Filing: 1982-09-09
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Granted: 1984-07-03
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Expires: 2002-09-09
Abstract
Abstract A method for controlling the temperature and composition of a vapor feedstream into a second reactor connected in series flow arrangement with a first reactor. The effluent stream from the first reactor containing vapor and liquid fractions is first cooled against a vapor stream and then further cooled against a suitable external fluid, then is phase separated to provide vapor and liquid fractions. The separated vapor fraction is reheated against the first reactor effluent stream and passed at an intermediate temperature into the second reactor. The first reactor is preferably an ebullated bed type catalytic reactor and the second reactor is preferably a fixed bed type catalytic reactor which is operated at an inlet temperature 20°-200° F. lower than the first reactor effluent stream temperature. If desired, the effluent stream from the first reactor can be initially phase separated into vapor and liquid factions, and the vapor fraction only passed to the first heat exchange step for cooling to a first lower temperature.
Inventors
- 👤 Lawrence M. Abrams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:24
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
167 words
A method for controlling the reactor temperature and hydrocarbon feed composition for a second reactor series-connected to a first reactor, comprising: (a) cooling a first reactor effluent stream at 700°-850° F. temperature and containing vapor and liquid fractions from a first temperature to a first lower temperature by a first heat exchange step against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled effluent stream at said first lower temperature against an externally supplied cooling fluid in a second heat exchange step to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled effluent stream; (d) reheating at least a portion of said separated vapor fraction by heat exchange with said first reactor effluent stream in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first temperature and second lower temperatures; and (e) feeding said reheated hydrocarbon vapor fraction at said intermediate temperature of 650°-830° F. to a second reactor.
Claim 2
Independent Claim
167 words
A method for controlling the reactor temperature and hydrocarbon feed composition for a second reactor series-connected to a first reactor, comprising: (a) cooling a first reactor effluent stream at 700°-850° F. temperature and containing vapor and liquid fractions from a first temperature to a first lower temperature by a first heat exchange step against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled effluent stream at said first lower temperature against an externally supplied cooling fluid in a second heat exchange step to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled effluent stream; (d) reheating at least a portion of said separated vapor fraction by heat exchange with said first reactor effluent stream in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first temperature and second lower temperatures; and (e) feeding said reheated hydrocarbon vapor fraction at said intermediate temperature of 650°-830° F. to a second reactor.
Claim 3
Dependent Claim
18 words
The temperature control method of claim 1, wherein said first reactor is an ebullated bed type catalytic reactor.
Claim 4
Dependent Claim
18 words
The temperature control method of claim 1, wherein said second reactor is a fixed bed type catalytic reactor.
Claim 5
Dependent Claim
29 words
The temperature control method of claim 1, wherein said inlet intermediate temperature to said second reactor is 20°-200° F. below the effluent stream first temperature from said first reactor.
Claim 6
Dependent Claim
17 words
The temperature control method of claim 1, wherein said external cooling fluid is a hydrogen-rich gas stream.
Claim 7
Dependent Claim
46 words
The temperature control method of claim 1, wherein a major portion of said vapor fraction is passed to said first cooling step for reheating the vapor in heat exchange with said first reactor effluent stream so as to control the intermediate temperature to said second reactor.
Claim 8
Dependent Claim
30 words
The temperature control method of claim 1, wherein said further cooling in a second heat exchange to said second lower temperature controls the composition of the separated vapor fraction stream.
Claim 9
Dependent Claim
46 words
The temperature control method of claim 1, wherein a minor portion of said vapor fraction is passed through a flow control valve directly to said second reactor, and wherein closing the flow control valve increases the intermediate temperature of said vapor feed to said second reactor.
Claim 10
Dependent Claim
17 words
The temperature control method of claim 5, wherein said hydrogen-rich gas is fed into said first reactor.
Claim 11
Dependent Claim
56 words
The temperature control method of claim 1, wherein said first reactor effluent stream containing vapor and liquid fractions is phase separated in an upstream phase separation step provided between said first reactor and said first heat exchanger, and the resulting vapor fraction is then cooled in said first heat exchange step to said first lower temperature.
Claim 12
Independent Claim
175 words
A method for controlling the reactor temperature and hydrocarbon vapor feed composition for a second reactor series-connected to a first reactor, comprising: (a) cooling a first effluent stream at 700°-850° F. temperature and containing vapor and liquid fractions at a first temperature to a first lower temperature by a first heat exchange against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled effluent stream at said first lower temperature against an externally supplied cooling fluid in a second heat exchange to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled effluent stream; (d) reheating at least a portion of said separated vapor fraction by heat exchange with said first reactor effluent stream in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first and second lower temperatures; and (e) feeding said reheated hydrocarbon vapor fraction at said intermediate temperature which is 50°-200° F. below said first temperature to a second reactor containing a fixed type catalyst bed.
Claim 13
Independent Claim
175 words
A method for controlling the reactor temperature and hydrocarbon vapor feed composition for a second reactor series-connected to a first reactor, comprising: (a) cooling a first effluent stream at 700°-850° F. temperature and containing vapor and liquid fractions at a first temperature to a first lower temperature by a first heat exchange against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled effluent stream at said first lower temperature against an externally supplied cooling fluid in a second heat exchange to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled effluent stream; (d) reheating at least a portion of said separated vapor fraction by heat exchange with said first reactor effluent stream in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first and second lower temperatures; and (e) feeding said reheated hydrocarbon vapor fraction at said intermediate temperature which is 50°-200° F. below said first temperature to a second reactor containing a fixed type catalyst bed.
Claim 14
Independent Claim
180 words
A method for controlling the reactor temperature and hydrocarbon feed composition for a second reactor series-connected to a first reactor, comprising: (a) separating from a first reactor effluent stream at 700°-850° F. and containing hydrocarbon vapor and liquid fractions a first vapor fraction at a first temperature, and cooling said vapor fraction to a first lower temperature by a first heat exchange step against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled first vapor fraction against an externally-supplied cooling fluid in a second heat exchange step to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled first vapor fraction and providing a second vapor fraction; (d) reheating at least a portion of said separated second vapor fraction by heat exchange with said first vapor fraction in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first temperature and second lower temperatures; and (e) feeding said reheated hydrocarbon second vapor fraction at said intermediate temperature of 650°-830° F. to a second reactor.
Claim 15
Independent Claim
180 words
A method for controlling the reactor temperature and hydrocarbon feed composition for a second reactor series-connected to a first reactor, comprising: (a) separating from a first reactor effluent stream at 700°-850° F. and containing hydrocarbon vapor and liquid fractions a first vapor fraction at a first temperature, and cooling said vapor fraction to a first lower temperature by a first heat exchange step against a vapor stream obtained from a downstream phase separation step; (b) cooling further said cooled first vapor fraction against an externally-supplied cooling fluid in a second heat exchange step to a second lower temperature; (c) separating vapor and liquid fractions from said further cooled first vapor fraction and providing a second vapor fraction; (d) reheating at least a portion of said separated second vapor fraction by heat exchange with said first vapor fraction in said cooling step (a) to provide a temperature of 650°-830° F. which is intermediate of said first temperature and second lower temperatures; and (e) feeding said reheated hydrocarbon second vapor fraction at said intermediate temperature of 650°-830° F. to a second reactor.
Claim 16
Dependent Claim
18 words
The temperature control method of claim 12, wherein said first reactor is an ebullated bed type catalytic reactor.
Claim 17
Dependent Claim
18 words
The temperature control method of claim 12, wherein said second reactor is a fixed bed type catalytic reactor.
Claim 18
Dependent Claim
29 words
The temperature control method of claim 12, wherein said inlet intermediate temperature to said second reactor is 20°-200° F. below the effluent stream first temperature from said first reactor.
Claim 19
Dependent Claim
36 words
The temperature control method of claim 12, wherein said first reactor effluent is a hydrocarbon-hydrogen mixture at 700°-850° F. temperature, and the feed to said second reactor is a hydrocarbon vapor fraction at 650°-830° F. temperature.
Claim 20
Dependent Claim
17 words
The temperature control method of claim 12, wherein said external cooling fluid is a hydrogen-rich gas stream.
Claim 21
Dependent Claim
46 words
The temperature control method of claim 12, wherein a major portion of said vapor fraction is passed to said first cooling step for reheating the vapor in heat exchange with said first reactor effluent stream so as to control the intermediate temperature to said second reactor.
Claim 22
Dependent Claim
30 words
The temperature control method of claim 12, wherein said further cooling in a second heat exchange to said second lower temperature controls the composition of said second vapor fraction stream.
Claim 23
Dependent Claim
46 words
The temperature control method of claim 12, wherein a minor portion of said vapor fraction is passed through a flow control valve directly to said second reactor, and wherein closing the flow control valve increases the intermediate temperature of said vapor feed to said second reactor.
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |