US4340466A
Expired / Lapsed
US
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Process for hydrotreating heavy oils containing metals
Assignee: Chiyoda Corp
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Filing: 1980-05-15
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Granted: 1982-07-20
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Expires: 2000-05-15
Abstract
Abstract A process for catalytically hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320 DEG to 470 DEG C. and a hydrogen pressure of 30 to 350 kg/cm2, wherein the oil is substantially desulfurized in the first step in the presence of a first-step catalyst and then demetallized in the second step in the presence of a second-step catalyst, the desulfurization selectivity (as defined in the specification) of the first-step catalyst being higher than that of the second-step catalyst. According to this process, the metal content and the sulfur content of the treated oil can be prescribed at the desired levels, and a low-sulfur, low-metal oil can be obtained with a relatively small amount of hydrogen chemically consumed.
Inventors
- 👤 Masayoshi Inooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:07
CPC Classifications
C; C10; C10G; C10G65/00; C10G65/02; C10G65/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
In a process for hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320° to 470° C. under a hydrogen pressure of 30 to 350 kg/cm 2 , the improvement which comprises using a first-step catalyst having a desulfurization selectivity γ 1 in the first step and a second-step catalyst having a desulfurization selectivity γ 2 , which is lower than γ 1 , in the second step, each of the desulfurization selectivities γ 1 and γ 2 being defined by the following equation: γ(i.e., γ.sub.1 or γ.sub.2)=(lnSo/S)/(lnMo/M) wherein So and S represent the sulfur contents of the starting heavy oil and the treated oil respectively, and Mo and M represent the metal contents of the starting oil and the treated oil respectively, and maintaining the partial pressure of hydrogen in the first step 10 to 50 kg/cm 2 lower than that in the second step.
Claim 2
Dependent Claim
151 words
In a process for hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320° to 470° C. under a hydrogen pressure of 30 to 350 kg/cm 2 , the improvement which comprises using a first-step catalyst having a desulfurization selectivity γ 1 in the first step and a second-step catalyst having a desulfurization selectivity γ 2 , which is lower than γ 1 , in the second step, each of the desulfurization selectivities γ 1 and γ 2 being defined by the following equation: γ(i.e., γ.sub.1 or γ.sub.2)=(lnSo/S)/(lnMo/M) wherein So and S represent the sulfur contents of the starting heavy oil and the treated oil respectively, and Mo and M represent the metal contents of the starting oil and the treated oil respectively, and maintaining the partial pressure of hydrogen in the first step 10 to 50 kg/cm 2 lower than that in the second step.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said hydrotreatment is carried out at a temperature of 350° to 430° C. and a hydrogen pressure of 70 to 200 kg/cm 2 .
Claim 4
Dependent Claim
16 words
The process of any one of claims 1 or 2 wherein γ 1 ≧0.5>γ 2 .
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein 0.65≦γ 1 <3 and γ 2 <0.5.
Claim 6
Dependent Claim
55 words
The process of one of claims 1 or 2 wherein said second-step catalyst has a carrier containing at least 25% by weight, as oxide, of silicon as a main constituent of its chemical composition, said carrier having a pore volume of at least 0.3 cc/g and an average pore diameter of 100 to 300 A.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said catalyst carrier is sepiolite or modified sepiolite.
Claim 8
Dependent Claim
31 words
The process of one of claims 1 or 2 wherein the partial pressure of hydrogen sulfide in the catalyst layer in the second step is 0.1 to 50 kg/cm 2 .
Claim 9
Dependent Claim
96 words
The process of one of claims 1 or 2 wherein said first-step catalyst comprises an alumina or alumina-silica carrier having a specific surface area of at least 80 m 2 /g, a pore volume of at least 0.4 cc/g and an average pore diameter of 60 to 200 A, and supported thereon (a) 0.5 to 30% by weight of at least one of V, Mo and W and (b) 0.1 to 12% by weight of Ni or Co or both, the atomic ratio of metal (b) to metal (a) deposited [(b)/(a)] being from 0.1 to 0.8.
Claim 10
Dependent Claim
30 words
The process of one of claims 1 or 2 wherein said second-step catalyst comprises at least one member selected from the group consisting of attapulgite, bauxite allophane and red mud.
Claim 11
Dependent Claim
70 words
The process of one of claims 1 or 2 wherein the ratio of the content of metals to the content of sulfur in the treated oil is prescribed beforehand by performing the reaction in the first-step catalyst zone under such conditions that the sulfur content of the oil becomes constant, and the reaction in the second-step catalyst zone under such conditions that the metal content in the oil becomes constant.
Claim 12
Dependent Claim
103 words
The process of one of claims 1 or 2 wherein said first-step catalyst comprises an alumina or alumina-silica carrier having a specific surface area of at least 80 m 2 /g, a pore volume of at least 0.4 cc/g and an average pore diameter of 60 to 200 A, and supported thereon (a) 0.5 to 30% by weight of at least one of V, Mo and W and (b) 0.1 to 12% by weight of Ni or Co or both, the atomic ratio of metal (b) to metal (a) deposited [(b)/(a)] being from 0.1 to 0.8, 0.65≦γ 1 <3 and γ 2 <0.5.
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |