US3974065A
Expired / Lapsed
US
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Early detection and warning method for controlling temperature excursions in hydro-processing hydrocarbons
Assignee: Chevron USA Inc
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Filing: 1974-12-31
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Granted: 1976-08-10
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Expires: 1994-12-31
Abstract
Abstract A method is disclosed for obtaining an early detection and warning of a dangerous temperature excursion in a process using one or more hydrocarbon hydroprocessing reactors operating under otherwise ordinary hydroprocessing conditions. The warning is obtained by monitoring the specific gravity and/or methane content of the light gas fraction of the reactor effluent product stream. Pursuant to the warning, one or more suitable quenching means are employed to control the excursion.
Inventors
- 👤 Bruce E. Powell
- 👤 Bruce E. Stangeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/72; B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; C10G49/00; C10G49/26; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00074; B01J2219/00087; B01J2219/00103; B01J2219/00121; B01J2219/0013; B01J2219/00164
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
193 words
A method for detecting a dangerous local temperature excursion in a continuous hydrocarbon hydroprocessing process containing at least one hydroprocessing reactor, said reactor previous to said excursion having been operating under normal hydrocarbon hydroprocessing conditions, including: a. a hydroprocessable hydrocarbon feed stream introduction into said reactor and into contact with a particulate contact mass contained in said reactor at a suitable feed rate, said reactor being selected from the group consisting of a fixed-bed or fluid-bed reactor; b. a suitable hydroprocessing temperature and pressure in said reactor; and c. a reactor effluent product stream comprising a light gas fraction and a liquid hydrocarbon product fraction being withdrawn from said reactor; which comprises: 1. continuously or periodically determining at least one parameter selected from the group consisting of methane content and relative specific gravity of said light gas fraction, said determinations being made during said continuous operation; and 2. comparing a set of said determinations, thereby detecting said excursion when said methane content increases an amount in the range from about 1.3 to 1.8 volume percent units or said relative specific gravity increases an amount in the range from about 0.02 to 0.04 unit.
Claim 2
Independent Claim
193 words
A method for detecting a dangerous local temperature excursion in a continuous hydrocarbon hydroprocessing process containing at least one hydroprocessing reactor, said reactor previous to said excursion having been operating under normal hydrocarbon hydroprocessing conditions, including: a. a hydroprocessable hydrocarbon feed stream introduction into said reactor and into contact with a particulate contact mass contained in said reactor at a suitable feed rate, said reactor being selected from the group consisting of a fixed-bed or fluid-bed reactor; b. a suitable hydroprocessing temperature and pressure in said reactor; and c. a reactor effluent product stream comprising a light gas fraction and a liquid hydrocarbon product fraction being withdrawn from said reactor; which comprises: 1. continuously or periodically determining at least one parameter selected from the group consisting of methane content and relative specific gravity of said light gas fraction, said determinations being made during said continuous operation; and 2. comparing a set of said determinations, thereby detecting said excursion when said methane content increases an amount in the range from about 1.3 to 1.8 volume percent units or said relative specific gravity increases an amount in the range from about 0.02 to 0.04 unit.
Claim 3
Dependent Claim
16 words
A method as in claim 1 further characterized in that said process provides a fixed-bed reactor.
Claim 4
Dependent Claim
24 words
A method as in claim 1 further characterized in that said process is a hydrodesulfurizing process and said hydrocarbon feed is a sulfur-containing residuum.
Claim 5
Dependent Claim
16 words
A method as in claim 1 further characterized in that said parameter is relative specific gravity.
Claim 6
Dependent Claim
24 words
A method as in claim 1 further characterized in that said temperature excursion is quenched by using at least one suitable ordinary quenching means.
Claim 7
Dependent Claim
32 words
A method as in claim 5 further characterized in that said quenching is carried out by introducing a relatively cold stream of hydrogen gas into the reactor containing the dangerous temperature excursion.
Claim 8
Dependent Claim
41 words
A method as in claim 5 further characterized in that said quenching is effected by introducing a relatively cold stream of hydrogen gas into said reactor and recycling at least a portion of said light gas product fraction to said reactor.
Claim 9
Dependent Claim
15 words
A process as in claim 1 further characterized in that said parameter is methane content.
Claim 10
Dependent Claim
16 words
A process as in claim 1 further characterized in that said parameter is relative specific gravity.
Claim 11
Independent Claim
266 words
A method for detecting a dangerous local temperature excursion in a continuous hydrocarbon hydrodesulfurizing process employing at least one reactor, said reactor previous to said excursion having been operating under normal hydrocarbon hydrodesulfurizing conditions, including: a. introducing a hydrodesulfurizable hydrocarbon feed stream selected from the group consisting of crude oil, refinery crude oil fractions, and partially refined crude oil fractions into said reactor and into contact with a particulate solid composite comprising a solid support or carrier and at least one catalytically active metallic components selected from the group consisting of metals, metal oxides and metal sulfides of Groups VIA and VIII of the periodic chart said introduction of feed being at a liquid hourly space velocity (LHSV) in a range from about 0.1 to 20, and said reactor being a fixed bed or fluid bed reactor; b. employing a temperature in the range from about 400° to 1100°F and a system pressure in the range from about 1 to 350 atmospheres; and c. withdrawing a reactor effluent product stream comprising a light gas fraction and a liquid hydrocarbon product fraction from said reactor, which comprises: 1. continuously or periodically determining at least one parameter selected from the group consisting of methane content and relative specific gravity of said light gas fraction, said determinations being made during continuous operation; and 2. comparing a set of said determinations, thereby detecting said excursion where said methane content increases an amount in the range from about 1.3 to 1.8 volume percent units or said relative specific gravity increases an amount in the range from about 0.02 to 0.04 unit.
Claim 12
Independent Claim
266 words
A method for detecting a dangerous local temperature excursion in a continuous hydrocarbon hydrodesulfurizing process employing at least one reactor, said reactor previous to said excursion having been operating under normal hydrocarbon hydrodesulfurizing conditions, including: a. introducing a hydrodesulfurizable hydrocarbon feed stream selected from the group consisting of crude oil, refinery crude oil fractions, and partially refined crude oil fractions into said reactor and into contact with a particulate solid composite comprising a solid support or carrier and at least one catalytically active metallic components selected from the group consisting of metals, metal oxides and metal sulfides of Groups VIA and VIII of the periodic chart said introduction of feed being at a liquid hourly space velocity (LHSV) in a range from about 0.1 to 20, and said reactor being a fixed bed or fluid bed reactor; b. employing a temperature in the range from about 400° to 1100°F and a system pressure in the range from about 1 to 350 atmospheres; and c. withdrawing a reactor effluent product stream comprising a light gas fraction and a liquid hydrocarbon product fraction from said reactor, which comprises: 1. continuously or periodically determining at least one parameter selected from the group consisting of methane content and relative specific gravity of said light gas fraction, said determinations being made during continuous operation; and 2. comparing a set of said determinations, thereby detecting said excursion where said methane content increases an amount in the range from about 1.3 to 1.8 volume percent units or said relative specific gravity increases an amount in the range from about 0.02 to 0.04 unit.
Claim 13
Dependent Claim
16 words
A method as in claim 10 further characterized in that said parameter is relative specific gravity.
Claim 14
Dependent Claim
24 words
A method as in claim 10 further characterized in that said temperature excursion is quenched by using at least one suitable ordinary quenching means.
Claim 15
Dependent Claim
32 words
A method as in claim 12 further characterized in that said quenching is carried out by introducing a relatively cold stream of hydrogen gas into the reactor containing the dangerous temperature excursion.
Claim 16
Dependent Claim
15 words
A process as in claim 10 further characterized in that said parameter is methane content.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |