US3714031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Residual oil
Assignee: Shell USA Inc
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Filing: 1970-11-18
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Granted: 1973-01-30
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Expires: 1990-11-18
Abstract
Abstract A desulfurized product of constant sulfur content is obtained by hydrodesulfurizing a sulfur-containing residual oil in the liquid phase over a fixed catalyst bed and applying an external product recycle of at least 3 volumes of desulfurized product per volume of residual oil, the recycle stream having a hydrogen sulfide content of at least 0.05 percent w.
Inventors
- 👤 Klinken J Van
- 👤 Der Toorn L Van
- 👤 J Ouwerkerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:25
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0207; B01J8/0214; C; C10; C10G; C10G2300/00; C10G2300/10; C10G2300/107
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A process for the catalytic hydrodesulfurization of a sulfur-containing residual hydrocarbon oil carried out substantially in a liquid phase in the presence of dissolved hydrogen and a solid sulfur-resistant catalyst which comprises adding to the feedstock a sulfur compound selected from the group consisting of hydrogen sulfide and a hydrogen sulfide precursor in an amount to provide at least 0.05 percent w of hydrogen sulfide in the liquid phase at the beginning of the process, and decreasing the quantity of sulfur compound added during the course of the process to less than 80 percent of the initial quantity as required to maintain an essentially constant hydrodesulfurization level, and withdrawing a desulfurized product.
Claim 2
Dependent Claim
112 words
A process for the catalytic hydrodesulfurization of a sulfur-containing residual hydrocarbon oil carried out substantially in a liquid phase in the presence of dissolved hydrogen and a solid sulfur-resistant catalyst which comprises adding to the feedstock a sulfur compound selected from the group consisting of hydrogen sulfide and a hydrogen sulfide precursor in an amount to provide at least 0.05 percent w of hydrogen sulfide in the liquid phase at the beginning of the process, and decreasing the quantity of sulfur compound added during the course of the process to less than 80 percent of the initial quantity as required to maintain an essentially constant hydrodesulfurization level, and withdrawing a desulfurized product.
Claim 3
Dependent Claim
43 words
The process of claim 1 wherein the sulfur compound added to the feed comprises an amount to provide at least 0.5 percent w of hydrogen sulfide and the sulfur content of the residual oil feedstock is reduced by at least 40 percent w.
Claim 4
Dependent Claim
62 words
The process of claim 1 wherein the liquid phase is a combined feedstock comprising residual oil and recycled desulfurized oil product in an amount of at least 3 volumes of product for each volume of residual oil, and wherein the quantity of added sulfur compound is decreased in the course of the process to less than 65 percent of that added initially.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein part of the desulfurized oil product is cooled and recycled for admixture with the residual oil without depressuring said product.
Claim 6
Dependent Claim
34 words
The process of claim 3 wherein the added sulfur compound is decreased by removing part of the hydrogen sulfide from the desulfurized product and recycling said product for combination with the residual oil feedstock.
Claim 7
Dependent Claim
45 words
The process of claim 3 wherein the hydrodesulfurization is carried out in the presence of from 5 to 30 Nl of hydrogen per liter of combined liquid feed and the sulfur content of the residual oil feedstock is reduced by at least 40 percent w.
Claim 8
Dependent Claim
25 words
The process of claim 3 wherein the combined feed is passed with hydrogen through a hydrogen saturation zone prior to contacting the solid sulfur-resistant catalyst.
Claim 9
Dependent Claim
62 words
The process of claim 1 wherein the liquid phase flows radially through a fixed catalyst bed in which at least 40 percent voluMe of the liquid phase flows through the top half of the catalyst bed, the solid sulfur-resistant catalyst has a particle size less than 2.0 mm, and the residual oil has a sulfur content of at least 1.0 percent w.
Claim 10
Dependent Claim
92 words
The process of claim 8 wherein the residual oil is substantially composed of hydrocarbons and one or more hetero atoms-containing organic carbon compounds boiling above 360*C, a substantial amount of asphaltic material, and has a sodium content of less than 50 ppmw; and the hydrodesulfurization is carried out at a temperature in the range of from 300*C to 475*C, a total pressure of from 30 to 350 kg/cm2, and a weight hourly space velocity of 0.3 to 5 parts by weight of residual oil per part by volume of catalyst per hour.
References Cited (Backward Citations)
US3441500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |