Patent US4430203A successfully refreshed from Google Patents.
US4430203A
Expired / Lapsed
US
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Hydrotreating or hydrocracking process
Assignee: Chevron USA Inc
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Filing: 1982-02-05
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Granted: 1984-02-07
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Expires: 2002-02-05
Abstract
Abstract A multistage hydrocracking or hydrotreating process wherein a two-phase reaction mixture of a hydrogen rich gas stream and liquid hydrocarbon is passed through a series of spaced catalyst beds and reaction vapors are withdrawn at each interspace between beds and replaced with hydrogen. Such withdrawal and replacement reduces the partial pressure of NH 3 and/or H 2 S in the reaction mixture entering the bed succeeding each interspace, thereby increasing the reaction rate between hydrogen and the liquid hydrocarbon.
Inventors
- 👤 Dennis R. Cash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:13
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/04; B01J8/0492; C; C10; C10G; C10G49/00; C10G49/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A process for hydroprocessing comprising: (a) passing a two-phase reaction mixture of a hydrogen rich gas and a liquid hydrocarbon containing at least one of either a nitrogen impurity or a sulfur impurity through a single vessel hydroprocessing reaction zone containing a series of fixed spaced hydroprocessing catalyst beds, at least two adjacent beds being separated by a first perforated tray, a second perforated tray and a third perforated tray, said first perforated tray and said second perforated tray defining a vapor withdrawal space and said second perforated tray and said third perforated tray defining a hydrogen introduction space; (b) withdrawing vapors containing at least one of either ammonia or hydrogen sulfide from said vapor withdrawal space; (c) introducing hydrogen into the hydrogen introduction space wherein the amount of hydrogen is substantially equal to the amount of withdrawn vapors; and (d) passing the liquid hydrocarbon directly to the next bed.
Claim 2
Dependent Claim
150 words
A process for hydroprocessing comprising: (a) passing a two-phase reaction mixture of a hydrogen rich gas and a liquid hydrocarbon containing at least one of either a nitrogen impurity or a sulfur impurity through a single vessel hydroprocessing reaction zone containing a series of fixed spaced hydroprocessing catalyst beds, at least two adjacent beds being separated by a first perforated tray, a second perforated tray and a third perforated tray, said first perforated tray and said second perforated tray defining a vapor withdrawal space and said second perforated tray and said third perforated tray defining a hydrogen introduction space; (b) withdrawing vapors containing at least one of either ammonia or hydrogen sulfide from said vapor withdrawal space; (c) introducing hydrogen into the hydrogen introduction space wherein the amount of hydrogen is substantially equal to the amount of withdrawn vapors; and (d) passing the liquid hydrocarbon directly to the next bed.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the vapors are withdrawn in a direction away from the flow of the liquid hydrocarbon and the hydrogen is introduced in a direction cocurrent with the flow of the liquid hydrocarbon.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein there are at least three beds in the series.
Claim 5
Dependent Claim
42 words
The process of claim 1 or 3 wherein the proportion of vapors withdrawn from said vapor withdrawal space is sufficient to significantly reduce the partial pressure of ammonia or hydrogen sulfide in the reaction mixture entering the succeeding bed in the series.
Claim 6
Dependent Claim
32 words
The process of claim 4 wherein the partial pressure of ammonia is reduced to below about one psia and the partial pressure of hydrogen sulfide is reduced to below about four psia.
Claim 7
Dependent Claim
17 words
The process of claim 4 wherein the said proportion is about 50% to about 100% by volume.
Claim 8
Dependent Claim
16 words
The process of claim 4 wherein said proportion is about 80% to about 95% by volume.
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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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |