Patent US4504377A successfully refreshed from Google Patents.
US4504377A
Expired / Lapsed
US
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Production of stable low viscosity heating oil
Assignee: Mobil Oil AS
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Filing: 1983-12-09
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Granted: 1985-03-12
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Expires: 2003-12-09
Abstract
Abstract This invention provides a two-stage visbreaking process for increasing the production of a visbroken hydrocarbon product from heavy oil feedstock, which meets heating oil viscosity specifications with little or no blending with external cutter stocks. The second stage visbreaking is conducted at a relatively high Severity in contact with a fluidized bed of particulate solids.
Inventors
- 👤 Paul Shu
- 👤 Tsoung Y. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:59
CPC Classifications
C; C10; C10G; C10G9/00; C10G9/007
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
168 words
A process for increasing the production of stable heating oil from heavy oil feedstock by improving visbreaking performance in steps which comprise (1) heat-treating a mixture of heavy oil feedstock and steam in a first stage visbreaking zone at the highest Severity that yields less than about 0.5 weight percent coke deposition, wherein the Severity is less than about 800 seconds, as expressed in equivalent reaction time at 800° F.; (2) introducing the first stage visbroken effluent into a second stage visbreaking zone containing a bed of particulate solids, and heat-treating the said visbroken effluent at the highest Severity that deposits toluene-insolubles on the particulate solids and yields a second stage visbroken effluent with not more than about 0.5 weight percent toluene-insoluble content, wherein the Severity is greater than about 800 seconds, as expressed in equivalent reaction time at 800° F.; separating the second stage visbroken effluent from the particulate solids and (3) fractionating the second stage visbroken effluent to provide a stable low viscosity heating oil product.
Claim 2
Dependent Claim
168 words
A process for increasing the production of stable heating oil from heavy oil feedstock by improving visbreaking performance in steps which comprise (1) heat-treating a mixture of heavy oil feedstock and steam in a first stage visbreaking zone at the highest Severity that yields less than about 0.5 weight percent coke deposition, wherein the Severity is less than about 800 seconds, as expressed in equivalent reaction time at 800° F.; (2) introducing the first stage visbroken effluent into a second stage visbreaking zone containing a bed of particulate solids, and heat-treating the said visbroken effluent at the highest Severity that deposits toluene-insolubles on the particulate solids and yields a second stage visbroken effluent with not more than about 0.5 weight percent toluene-insoluble content, wherein the Severity is greater than about 800 seconds, as expressed in equivalent reaction time at 800° F.; separating the second stage visbroken effluent from the particulate solids and (3) fractionating the second stage visbroken effluent to provide a stable low viscosity heating oil product.
Claim 3
Dependent Claim
34 words
A process in accordance with claim 1 wherein the heat treatment in the first stage visbreaking zone is conducted at a temperature between about 700°-900° F. for a residence time between about 0.1-1 hour.
Claim 4
Dependent Claim
34 words
A process in accordance with claim 1 wherein the heat treatment in the second stage visbreaking zone is conducted at a temperature between about 700°-1000° F. for a residence time between about 0.2-2 hours.
Claim 5
Dependent Claim
31 words
A process in accordance with claim 1 wherein a low molecular weight hydrocarbon component is introduced into the second stage visbreaking zone to promote deposition of toluene-insolubles on the particulate solids.
Claim 6
Dependent Claim
15 words
A process in accordance with claim 1 wherein the bed of particulate solids is fluidized.
Claim 7
Dependent Claim
15 words
A process in accordance with claim 1 wherein the bed of particulate solids is moving.
Claim 8
Dependent Claim
15 words
A process in accordance with claim 1 wherein the bed of particulate solids is fixed.
Claim 9
Dependent Claim
28 words
A process in accordance with claim 1 wherein the heating oil product has a 270° F. + bottom viscosity of less than about 2000 centistokes at 100° F.
Claim 10
Dependent Claim
23 words
A process in accordance with claim 1 wherein the heating oil product has a metals content less than about 50 parts per million.
Claim 11
Dependent Claim
22 words
A process in accordance with claim 1 wherein the heating oil product has a sulfur content less than about 3 weight percent.
Claim 12
Dependent Claim
22 words
A process in accordance with claim 1 wherein the heating oil product has a nitrogen content less than about 0.2 weight percent.
Claim 13
Dependent Claim
23 words
A process in accordance with claim 1 wherein the heating oil product has a Conradson Carbon Residue less than about 10 weight percent.
Claim 14
Dependent Claim
134 words
A process for increasing the production of stable heating oil from heavy oil feedstock by improving visbreaking performance in steps which comprise (1) heat-treating a mixture of heavy oil feedstock and steam in a first stage visbreaking zone at the highest Severity that yields less than about 0.5 weight percent coke deposition; (2) introducing the first stage visbroken effluent into a second stage visbreaking zone containing a bed of particulate coke solids, and heat-treating the said visbroken effluent at the highest Severity that deposits toluene-insolubles on the particulate coke solids and yields a second stage visbroken effluent with not more than about 0.5 weight percent toluene-insoluble content; separating the second stage visbroken effluent from the particulate solids and (3) fractionating the second stage visbroken effluent to provide a stable low viscosity heating oil product.
Claim 15
Dependent Claim
134 words
A process for increasing the production of stable heating oil from heavy oil feedstock by improving visbreaking performance in steps which comprise (1) heat-treating a mixture of heavy oil feedstock and steam in a first stage visbreaking zone at the highest Severity that yields less than about 0.5 weight percent coke deposition; (2) introducing the first stage visbroken effluent into a second stage visbreaking zone containing a bed of particulate coke solids, and heat-treating the said visbroken effluent at the highest Severity that deposits toluene-insolubles on the particulate coke solids and yields a second stage visbroken effluent with not more than about 0.5 weight percent toluene-insoluble content; separating the second stage visbroken effluent from the particulate solids and (3) fractionating the second stage visbroken effluent to provide a stable low viscosity heating oil product.
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) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |