Patent US4039604A successfully refreshed from Google Patents.
US4039604A
Expired / Lapsed
US
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Hydrocarbon isomerization with increased temperature and lowered hydrogen/hydrocarbon ratio
Assignee: Phillips Petroleum Co
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Filing: 1975-08-18
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Granted: 1977-08-02
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Expires: 1995-08-18
Abstract
Abstract In a process for isomerizing light hydrocarbons with a catalyst system comprising a halogenated alumina or platinum alumina when hydrogen is utilized to sustain the catalyst activity, the ratio of hydrogen to hydrocarbon in the feed is decreased and the temperature increased after a substantial period of operation. This results in an improved conversion and selectivity which allows for increasing the total catalyst life.
Inventors
- 👤 John W. Myers
- 👤 James W. Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:25
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/2206; C07C5/226; C07C5/27; C07C5/2767; C07C5/277; C07C5/2791; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/38; C07C2523/40; C07C2523/42; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/951
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
In an isomerization process wherein a hydrocarbon feed is contacted with a chloride- or bromide-activated alumina or platinum-alumina catalyst in the presence of hydrogen at a mole ratio of said hydrogen to said hydrocarbon within the range of 0.25:1 to 10:1 at a temperature below 400° F. (204° C.) and an isomerized product recovered, the improvement comprising: after said process has been carried out for at least 1 month increasing the temperature 50°-200° F. (58°-111° C.) and decreasing said ratio of hydrogen to hydrocarbon at least 20 percent, said decrease in said ratio of hydrogen to hydrocarbon thereby enhancing the production of the desired isomer.
Claim 2
Dependent Claim
105 words
In an isomerization process wherein a hydrocarbon feed is contacted with a chloride- or bromide-activated alumina or platinum-alumina catalyst in the presence of hydrogen at a mole ratio of said hydrogen to said hydrocarbon within the range of 0.25:1 to 10:1 at a temperature below 400° F. (204° C.) and an isomerized product recovered, the improvement comprising: after said process has been carried out for at least 1 month increasing the temperature 50°-200° F. (58°-111° C.) and decreasing said ratio of hydrogen to hydrocarbon at least 20 percent, said decrease in said ratio of hydrogen to hydrocarbon thereby enhancing the production of the desired isomer.
Claim 3
Dependent Claim
41 words
A process according to claim 1 wherein said extended period of time in which the said process is carried out prior to said decrease in said ratio of hydrogen to hydrocarbon is within the range of one month to two years.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein said ratio of hydrogen to hydrocarbon is reduced to 0.01:1 to 0.20:1 moles of hydrogen per mole of hydrocarbon.
Claim 5
Dependent Claim
22 words
A process according to calim 1 wherein said temperature is increased first and thereafter said ratio of hydrogen to hydrocarbon is decreased.
Claim 6
Dependent Claim
22 words
A process according to calim 1 wherein said temperature is increased first and thereafter said ratio of hydrogen to hydrocarbon is decreased.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein said ratio of hydrogen to hydrocarbon is decreased and thereafter said temperature is increased.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein said ratio of hydrogen to hydrocarbon is decreased and said temperature increased simultaneously.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein said catalyst is a chloride-activated platinum-alumina.
Claim 10
Dependent Claim
37 words
A process according to claim 7 wherein said hydrocarbon is butane and said temperature is initially within the range of 300° to 350° F. and is raised to a level within the range 425° to 450° F.
Claim 11
Dependent Claim
29 words
A process according to claim 1 wherein said temperature initially is within the range of 200° to 390° F. and increased 50°-200° F. during the life of the catalyst.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |